https://www.explainxkcd.com/wiki/api.php?action=feedcontributions&feedformat=atom&user=172.68.144.147 2026-06-27T09:36:45Z User contributions MediaWiki 1.30.0 https://www.explainxkcd.com/wiki/index.php?title=2968:_University_Age&diff=348139 2024-08-06T02:52:19Z

<p>172.68.144.147: move incomplete transcript tag to top of section, add line breaks</p> <hr /> <div>{{comic<br /> | number = 2968<br /> | date = August 5, 2024<br /> | title = University Age<br /> | image = university_age_2x.png<br /> | imagesize = 317x388px<br /> | noexpand = true<br /> | titletext = This only makes it more urgent that we adopt my roadmap for the next 10 years, which should put us solidly in the lead.<br /> }}<br /> <br /> ==Explanation==<br /> {{incomplete|Created by an ANGRY SCHOOL LEADERSHIP COMMITTEE - Please change this comment when editing this page. Do NOT delete this tag too soon.}}<br /> <br /> ==Transcript==<br /> {{incomplete transcript|Do NOT delete this tag too soon.}}<br /> <br /> [Cueball is standing at a podium on a stage.]<br /> <br /> When I took the helm five years ago, our university was 213 years old – the second oldest in the state, just behind our 215-year-old rival.<br /> <br /> Under my leadership, we've funded an intensive program to increase our age to 218, overtaking our rival by 3.<br /> <br /> Unfortunately, I have terrible news.<br /> <br /> {{comic discussion}}</div>

172.68.144.147 https://www.explainxkcd.com/wiki/index.php?title=2968:_University_Age&diff=348137 2024-08-06T02:51:01Z

<p>172.68.144.147: Added initial transcript - probably needs work</p> <hr /> <div>{{comic<br /> | number = 2968<br /> | date = August 5, 2024<br /> | title = University Age<br /> | image = university_age_2x.png<br /> | imagesize = 317x388px<br /> | noexpand = true<br /> | titletext = This only makes it more urgent that we adopt my roadmap for the next 10 years, which should put us solidly in the lead.<br /> }}<br /> <br /> ==Explanation==<br /> {{incomplete|Created by a BOT - Please change this comment when editing this page. Do NOT delete this tag too soon.}}<br /> <br /> ==Transcript==<br /> [Cueball is standing at a podium on a stage.]<br /> <br /> When I took the helm five years ago, our university was 213 years old – the second oldest in the state, just behind our 215-year-old rival. Under my leadership, we've funded an intensive program to increase our age to 218, overtaking our rival by 3. Unfortunately, I have terrible news.<br /> {{incomplete transcript|Do NOT delete this tag too soon.}}<br /> <br /> {{comic discussion}}</div>

172.68.144.147 https://www.explainxkcd.com/wiki/index.php?title=List_of_all_comics_(3000-3500)&diff=340651 2024-04-25T23:56:22Z

<p>172.68.144.147: Added #2921 into the list</p> <hr /> <div>{{List of comics}}<br /> <br /> This is a list of comics from 2501 to {{LATESTCOMIC}}.<br /> <br /> {| class=&quot;wikitable sortable plainlinks table-padding&quot;<br /> |-<br /> !Number<br /> !Title<br /> !Talk<br /> !Image<br /> !Date&lt;onlyinclude&gt;<br /> {{comicsrow|2924|2024-04-24|Pendulum Types|pendulum types 2x.png}}<br /> {{comicsrow|2923|2024-04-22|Scary Triangles|scary triangles 2x.png}}<br /> {{comicsrow|2922|2024-04-19|Pub Trivia|pub trivia 2x.png}}<br /> {{comicsrow|2921|2024-04-17|Eclipse Path Maps|eclipse path maps 2x.png}}<br /> {{comicsrow|2920|2024-04-15|Survey Marker|survey marker 2x.png}}<br /> {{comicsrow|2919|2024-04-12|Sitting in a Tree|sitting in a tree 2x.png}}<br /> {{comicsrow|2918|2024-04-11|Tick Marks|tick marks 2x.png}}<br /> {{comicsrow|2917|2024-04-08|Types of Eclipse Photo|types of eclipse photo 2x.png}}<br /> {{comicsrow|2916|2024-04-05|Machine|machine 2x.png}}<br /> {{comicsrow|2915|2024-04-03|Eclipse Clouds|eclipse clouds 2x.png}}<br /> {{comicsrow|2914|2024-04-01|Eclipse Coolness|eclipse coolness 2x.png}}<br /> {{comicsrow|2913|2024-03-29|Periodic Table Regions|periodic table regions 2x.png}}<br /> {{comicsrow|2912|2024-03-27|Cursive Letters|cursive letters 2x.png}}<br /> {{comicsrow|2911|2024-03-25|Greenland Size|greenland size 2x.png}}<br /> {{comicsrow|2910|2024-03-22|The Wreck of the Edmund Fitzgerald|the wreck of the edmund fitzgerald 2x.png}}<br /> {{comicsrow|2909|2024-03-20|Moon Landing Mission Profiles|moon landing mission profiles 2x.png}}<br /> {{comicsrow|2908|2024-03-18|Moon Armor Index|moon armor index 2x.png}}<br /> {{comicsrow|2907|2024-03-15|Schwa|schwa 2x.png}}<br /> {{comicsrow|2906|2024-03-13|Earth|earth 2x.png}}<br /> {{comicsrow|2905|2024-03-11|Supergroup|supergroup 2x.png}}<br /> {{comicsrow|2904|2024-03-08|Physics vs. Magic|physics vs magic 2x.png}}<br /> {{comicsrow|2903|2024-03-06|Earth/Venus Venn Diagram|earth venus venn diagram 2x.png}}<br /> {{comicsrow|2902|2024-03-04|Ice Core|ice core 2x.png}}<br /> {{comicsrow|2901|2024-03-01|Geographic Qualifiers|geographic qualifiers 2x.png}}<br /> {{comicsrow|2900|2024-02-28|Call My Cell|call my cell 2x.png}}<br /> {{comicsrow|2899|2024-02-26|Goodhart's Law|goodharts law 2x.png}}<br /> {{comicsrow|2898|2024-02-23|Orbital Argument|orbital argument 2x.png}}<br /> {{comicsrow|2897|2024-02-21|Light Leap Years|light leap years 2x.png}}<br /> {{comicsrow|2896|2024-02-19|Crossword Constructors|crossword constructors 2x.png}}<br /> {{comicsrow|2895|2024-02-16|Treasure Chests|treasure chests 2x.png}}<br /> {{comicsrow|2894|2024-02-14|Research Account|research account 2x.png}}<br /> {{comicsrow|2893|2024-02-12|Sphere Tastiness|sphere tastiness 2x.png}}<br /> {{comicsrow|2892|2024-02-09|Banana Prices|banana prices 2x.png}}<br /> {{comicsrow|2891|2024-02-07|Log Cabin|log cabin 2x.png}}<br /> {{comicsrow|2890|2024-02-05|Relationship Advice|relationship advice 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172.68.144.147 https://www.explainxkcd.com/wiki/index.php?title=Talk:2916:_Machine&diff=339625 2024-04-14T13:18:02Z

<p>172.68.144.147: </p> <hr /> <div>&lt;!--Please sign your posts with ~~~~ and don't delete this text. New comments should be added at the bottom.--&gt;<br /> rather late for an april fools comic innit? also there doesn't seem to be anything exciting in this one lol, none of the usual cool exploration easter eggs, as far as i could tell at least [[Special:Contributions/172.71.178.76|172.71.178.76]] 16:41, 6 April 2024 (UTC)Erfaniom<br /> :Randall posted an eclipse comic on Apr. 1. All April Fools comics are interactive. [[User:Z1mp0st0rz|Z1mp0st0rz]] ([[User talk:Z1mp0st0rz|talk]]) 15:27, 10 April 2024 (UTC)<br /> <br /> : We're exploring crowdsourced human creativity here, in a way, so it can be a lot more interesting then Randall's exploration comics, at least for me, because i did take two years of GCSE psychology and enjoyed it. [[Special:Contributions/172.64.238.130|172.64.238.130]]<br /> <br /> : looks like the egg's on my face lmao, i think i was among the first people to make anything, so everywhere was under construction for me, i didn't even understand that it was like a crowd thing [[Special:Contributions/172.70.210.52|172.70.210.52]] 14:19, 9 April 2024 (UTC)Erfaniom<br /> <br /> Just popped over using Chrome on Android and all I see is four &quot;missing picture&quot; logos spinning around, plus another down the bottom right... [[Special:Contributions/141.101.68.193|141.101.68.193]] 18:13, 6 April 2024 (UTC)<br /> :Okay, followup: it behaves quite differently on the non mobile site. You get two entry points with red balls and yellow balls and you need to place the various gizmos to direct the balls to the correct exit point. Once enough have correctly passed to turn the red X into a green tick, you have the option to submit. If you do, once you have named your design it will be added to the grid with other submissions all of which exist to push red and yellow balls around. (if you come across &quot;Memories of Ragnarok&quot;, that's mine) [[Special:Contributions/172.71.134.207|172.71.134.207]] 18:27, 6 April 2024 (UTC)<br /> ::The number of inputs appears to vary between 1 and 4, each of a different color, with one color-coded output for each. [[User:Claire Kholin|Claire Kholin]] ([[User talk:Claire Kholin|talk]]) 18:49, 6 April 2024 (UTC)<br /> <br /> On the &quot;machine&quot; section, you see lots of &quot;under construction cells&quot;. Perhaps this will develop as more are submitted. I notice the &quot;under construction tape&quot; has &quot;DJIA&quot; and &quot;31415&quot;, perhaps a reference to &quot;dow jones industrial average&quot; and the first five digits of pi. [[User:Zeimusu|Zeimusu]] ([[User talk:Zeimusu|talk]]) 18:37, 6 April 2024 (UTC)<br /> :Whenever someone submits a cell, it fills in one of the under construction cells. [[User:Claire Kholin|Claire Kholin]] ([[User talk:Claire Kholin|talk]]) 18:49, 6 April 2024 (UTC)<br /> [Robert'); DROP TABLE Student!:;--] i just got a machine with 3 outputs one yellow another red and a third blue AND green and 3 inputs one green one blue and one red blue and yellow https://xkcd.com/2916/#xt=7&amp;yt=50 hope its still there {{unsigned ip|172.70.115.173|18:01, 9 April 2024}}<br /> :I think I just 'did' one with a Red+Yellow source (also separate singular Blue and Green) and a combined Blue+Green sink (and separate Yellow and Red). Got it working well, actually using fan-levitation to separate the R+Y enough to route them to their destinations, the Y then having to cross the occasional flying Green (which I was forced to &quot;Bonk&quot; and bounce up, entry being nearly at the bottom on right, exit being nearly at top on left) for its exit, everything else fairly simple. No idea if it got integrated, of course. Never seen any of my machines be accepted (when I later look around at what's there), so I'm still unsure if there's anything I can do to increase my chance of a successful square being made permanent on the grid.... [[Special:Contributions/172.70.163.49|172.70.163.49]] 20:58, 9 April 2024 (UTC)<br /> :...still had it sitting there [https://imgur.com/kZdp3kH on my browser], though note that the Red+Yellow supply (mid-left) and the Green supply (right) aren't working here, through the &quot;move the screen around, lose the feeds from 'Under Construction' squares&quot; issue, or similar. But still I managed to submit it. The occasional Yellow and Red are falling from the Blue entrance in the top (I've not done anything special to filter those out/send them to a more proper exit, and it's too late to do so now anyway, it was just a Blue entry during the development process, of course).<br /> :It's a pity you can't see it working, but I quite like my Yellow/Red separation. This might be the only time you see it in place, though, so a shame I didn't take a screenshot immedediately after submitting it. [[Special:Contributions/172.70.163.49|172.70.163.49]] 21:30, 9 April 2024 (UTC)<br /> :I encountered a puzzle with five distinct pairs of in/out (none combined): Two blue, two red, one yellow. It was difficult! AFAIK five pairs is the highest reported so far. When I submitted the solution to the Machine, it had Under Construction above and to each side, and (IIRC) empty below, and no balls were provided, alas.[[Special:Contributions/172.69.134.216|172.69.134.216]] 03:46, 12 April 2024 (UTC)<br /> I wanted to add an image for each object, but do not have the necessary access, can someone who has access add the images that I linked in the table so they can be included? [[User:Claire Kholin|Claire Kholin]] ([[User talk:Claire Kholin|talk]]) 18:49, 6 April 2024 (UTC)<br /> <br /> I found a discussion with some guy talking about the API at https://euphoria.leet.nu/room/xkcd/ ; this could be useful for the wiki.<br /> <br /> &lt;code&gt;<br /> [c+1] now time to try fucking with the api<br /> [c+1] https://incredible.xkcd.com/<br /> [userwithnoaccount] 404<br /> [c+1] it seems there are numbered machines under incredible.xkcd.com/machine/x<br /> [c+1] returns a grid of individual machinlets<br /> [c+1] which are uids like 3a7af27c-5389-5dcb-b660-3feab6be2ceb<br /> [c+1] they're stored at urls like incredible.xkcd.com/folio/3a7af27c-5389-5dcb-b660-3feab6be2ceb<br /> [c+1] there appear to be 33 machines total<br /> [c+1] the json it returns seems to refer to these as &quot;versions&quot;<br /> [c+1] $ curl -s https://incredible.xkcd.com/machine/21 | jq &quot;.version&quot;<br /> 21<br /> [c+1] there is a machine/0, but it's all null<br /> [c+1] going to https://incredible.xkcd.com/machine/current redirects to the current machine<br /> [c+1] $ curl -sL https://incredible.xkcd.com/machine/current | jq &quot;.version&quot;<br /> 35<br /> [c+1] wait, is that the *total* number of mahcines?<br /> [c+1] i would've thought there'd be more<br /> [c+1] this whole think is rather esoteric<br /> [c+1] Written in rust, too: https://rapier.rs/<br /> [c+1] Uh oh.<br /> https://i.hypercone.us/?v=8e283d<br /> [c+1] HMMM<br /> https://i.hypercone.us/?v=079f8f<br /> [c+1] it seems there is no limit<br /> [c+1] i've uploaded a ~50M title<br /> &lt;/code&gt;<br /> <br /> With this I was able to make a script that visualizes paths of the balls. I was hoping that there would be an interesting pattern somewhere but it appears to be mostly random (https://i.imgur.com/ZvLlucU.png) --[[Special:Contributions/172.71.131.24|172.71.131.24]] 17:12, 12 April 2024 (UTC)<br /> <br /> <br /> [[Special:Contributions/172.70.57.146|172.70.57.146]]<br /> <br /> Had quite a lot of fun, added a few 'successful' machines to the grid. Noted that whenever I try to use the Prism that (after a short delay) the comic-pane blanks and I need to refresh the page/get a completely new 'challenge' to start from scratch, so I'm just not using the prism at all (used most of the other items, in combination or 'just the one across the whole board', whichever seems most fun). But it doesn't seem to do what I'd like it to do, which is sort multiple colours from the same inflow into different outflow directions. Which would be ''very'' useful in a 'crossroads' situation, the general solution of directing them cross-path being too prone to random collisions. Also might be useful in the 'submitted machine grid', as I note that errors propagate, whereas adding a filter on all inputs would clean out (dispose of/send off to a valid gate?) the rogue balls. Anyway, gonna have to come back to this later when there's more time... Maybe then I'll even have something useful to add to the Explanation. [[Special:Contributions/172.70.163.31|172.70.163.31]] 19:03, 6 April 2024 (UTC)<br /> <br /> The balls appear to be different weights. I just saw a machine that used fans to separate yellows from greens and blues in a sort of 'wheat from the chaff' manner to direct them to their correct outputs. I wonder what other hidden tricks are included. [[Special:Contributions/172.68.1.159|172.68.1.159]] 19:40, 6 April 2024 (UTC)<br /> <br /> <br /> <br /> They're not all accepted, though it makes you think they are. Or something else more complex is going on we haven't realized yet. I made a machine that was working reliably, submitted it, and saw it on the overall grid. Reloading from a different browser I found the same location of the machine, with the same surroundings, but my machine had been replaced. It's nowhere else on the grid either. The first browser still shows it (but not after a reload with a cache clear). I'm not sure if there's some kind of &quot;save&quot; event that needs to happen beyond seeing your machine in the broader one, or if all user collaboration is an illusion, or if the system changes its mind about us somehow.<br /> <br /> : Yeah, i've been seeing this too. Please tell me if you find any of my machines, images at https://i.hypercone.us/?v=22d562 , https://i.hypercone.us/?v=ad8e3a , and https://i.hypercone.us/?v=8d4d6a . I want to be one of the few to have added Catalan and Spanish to the grid. [[Special:Contributions/172.71.134.164|172.71.134.164]] 20:56, 6 April 2024 (UTC)<br /> <br /> I've added some more observations to the page. Also, a guess which is too uncertain to put on the main page: The ball launcher for the yellows on the far left side misses a lot, and the yellow container isn't the one on the left. So I think the whole machine with crossing streams will result in the colors being sorted in their container order, and possibly have the streams combined and deposited at the bottom just above the containers. --[[Special:Contributions/172.71.147.100|172.71.147.100]] 21:07, 6 April 2024 (UTC)<br /> <br /> has anyone seen the boat at the very bottom? [[User:Mushrooms|Mushrooms]] ([[User talk:Mushrooms|talk]]) 21:21, 6 April 2024 (UTC)<br /> <br /> trying to see it on Firefox for Ubuntu and it just tells me to &quot;visit xkcd.com to view&quot; - THAT'S WHERE I AM?! Tried clearing website data (but not my entire cache) and that didn't help. Is there something I'm missing?<br /> <br /> Oooh, just had one with four ball-entries (four colours) and ''three'' exits (one caters for two arrows). Pity it's rather complicated to get entries to exits (even if I can merge two of the streams). Might have to give up on it, but I'd like to have seen how it fits in with the 'submited grid'. i.e. someone else gets a two-colour introduction spot. [[Special:Contributions/162.158.74.119|162.158.74.119]] 22:37, 6 April 2024 (UTC)<br /> :Me again. I'm just refreshing the page, looking at the pattern of entries/exits (just a dozen or so screens in, getting some repeats of pattern, indicating that it's going back to tiles it was suggesting before, probably depends on how many others are contributing and extending...)<br /> :Found another 'double-colour' example. Two yellows ''from the same side'', which probably means that there's a two-yellows been asked to exit from the neighbour (will check shortly).<br /> :Quickly adapting from my spreadsheet notation, &quot;R, Y, G, B&quot; in order, each &quot;(Entry, Exit)&quot;, I've been using &lt;dir&gt; of L/R/T/B and a number (nominally percentage, though seems to include only values of 20, 30, 50, 70 and 80, so it ''might'' be more 1/6..5/6?) relating to the distance along from L to R (for T/B) or T to B (for L/R).<br /> :This line is therefore (0,0)(L20+L70,R30+B70)(R80,L80)(T70,L50) ... no reds, two yellow pairings, a red pairing, a blue pairing. Would require at least two path-crossings (but I was going to calculate those things later, and double-colours might confuse my intended simple line-intersection calculation).<br /> :...anyway, spent some time on this message, which might mean I'll get into a 'new batch' of available patterns as people have succeeded some of the challenges that I've been 'swiping left'. [[Special:Contributions/172.70.162.20|172.70.162.20]] 19:28, 7 April 2024 (UTC)<br /> :...very next click: (0,0)(T30+L20,R20+R70)(R80,L80)(R50,B50), which is clearly the actual left-neighbour of the above. [[Special:Contributions/172.70.162.19|172.70.162.19]] 19:32, 7 April 2024 (UTC)<br /> :Ok, stopped my refreshing to [https://imgur.com/a/OMFOmzy 'solve' a screen]. First of all I routed both yellows entries (right-upper and upper-right) to one yellow exit (middle-left) and gradually teased the greens across (lower-left to middle-right), as that way I was avoiding a criss-cross of balls, but the the other yellow exit (left-lower) was, of course, invalid.<br /> :Changed it to drop one stream of yellows down towards the lower exit, across the rapidly firing greens (added a fan to filter away the occasional yellow that gets bounced over there, not much of an opportunity to filter falling-greens out of the yellow exit, so apologies to whoever gets the sceen below). Submited as &quot;Two Yellows, One Green!&quot;, whether or not that'll save (apparently, I should continue to contribute and not refresh/close, or else the server will not keep the solution?).<br /> :Interestingly, all four adjacent tiles are &quot;Under construction&quot;, and if I scroll up... *DARN* the comic has blanked out (nothing there between the upper PREV/RANDOM/NEXT buttons and the lower ones, just whitespace). This may mean that it did not save. This is the kind of 'page crash' I get when I try using a Prism or get too many balls rattling around on top of a Black Hole. Perhaps it doesn't like that I'm scrolling into an Under Construction that shouldn't be there? (But then, why ''is'' it there?)<br /> :Anyway, all extra information for everyone.<br /> :I'll just refresh the page and go back and do some more entry/exit mapping, maybe? [[Special:Contributions/172.70.162.20|172.70.162.20]] 20:17, 7 April 2024 (UTC)<br /> <br /> <br /> <br /> If you combine a bunch of these silly claw things in the middle by just spamming it, it begins to lag and do some chaotic collisions, even without balls colliding on it. It's curious how it does that seemingly randomly though. I wonder how calculations are added and if there's a tiny sprinkle of RNG. (Also, errors occur and say something about damaging recursion in the Rust programming language, so I guess we know how it was made. It's also pretty weird how there's not a lot of opening combinations? It's possible that the machine loops over in chunks of gears or something (that's what I'll call them). ([[User talk:Leo|talk]]) 13:15, 7 April 2024 (UTC)<br /> <br /> If you place a black hole in the centre of a wheel, it makes the wheel behave unpredictably between resets. Sometimes it's almost normal, sometimes it's a lot faster than usual, and sometimes it's stopped but launches balls that touch it with extreme force. I was able to use this to submit a machine which didn't actually let a single ball through after being submitted. https://i.hypercone.us/?v=928bcd [[Special:Contributions/162.158.33.149|162.158.33.149]] 01:19, 7 April 2024 (UTC)<br /> <br /> The page says that (and I have taken note of) the ball hue is ''coded'' to certain values, but is there a logic to those values that might be derived from the colour (either as RGB triplet or HSV/other colourspace definition). For example, the two ball-types with zero green component in their makeup are 'unit density' (green is far heavier &quot;green+red&quot; is far lighter, so it's not a simple relationship, unless it converts from °hue, in some way) and the only secondary colour exhibits non-zero drag. There's the possibility that it just derived from &quot;we need different properties, we need different colours, we have no reason to connect either with other deliberately&quot; or even some non-mathematical symbology (fire=red, water=blue(?), earth=green, air(/sunlight?)=yellow). But it makes me wonder what combination of properties cyan/magenta balls might have, if added. (Or is the choice of those four colours constrained, anyway? Though R/G colorblindness is already something of an accessibility failure, if anyone suffers that.) [[Special:Contributions/172.69.194.205|172.69.194.205]] 17:02, 7 April 2024 (UTC)<br /> :For color vision issues, on Mac, open System Preferences, select Accessibility, select Display (in the Vision group), select the Color Filters tab, select Enable Color Filters, then finally try the different filters in the Filter Type menu. One of them should help make the colors distinct.[[Special:Contributions/172.69.134.216|172.69.134.216]] 03:40, 12 April 2024 (UTC)<br /> <br /> [https://pastebin.com/7PAiLnyF Python script to get the URL and title of each Cell in the current machine]<br /> <br /> [https://pastebin.com/xBhywGde Result of running that script at the moment] (encoded with ROT13 because pastebin wouldn't let me save it otherwise)<br /> :has anybody at all whatsoever been able to find their creation using this API? [[User:Bellydrum|Bellydrum]] ([[User talk:Bellydrum|talk]]) 21:58, 7 April 2024 (UTC)<br /> <br /> [https://pastebin.com/jN5MP2za Result of running that script on the first 42 machines], at least on these it looks like the only difference is that one cell is added each time? [[Special:Contributions/172.71.99.195|172.71.99.195]] 17:22, 7 April 2024 (UTC)<br /> <br /> I've submitted four now, none of which was accepted. I tend to spend a lot of time getting them just right. Any hints as to what the acceptance criteria might be? Or do I just stink at this?<br /> [[Special:Contributions/172.69.59.204|172.69.59.204]] 19:47, 7 April 2024 (UTC)<br /> <br /> There appears to be a new object: a cat that bats things that touch it.<br /> [[Special:Contributions/172.69.214.39|172.69.214.39]] 20:17, 7 April 2024 (UTC)<br /> <br /> Is anyone else experiencing the bug where prisms cause the comic to disappear (leaving only the white background where it was) after a while? It makes viewing the whole machine basically impossible. (On further testing it appears to be firefox-exclusive.) [[Special:Contributions/172.70.162.38|172.70.162.38]] 20:31, 7 April 2024 (UTC)<br /> :I've had the &quot;Prisms break things&quot; from the beginning (before any practical content). As in, trying to use them in a design breaks things. But I ''did'' glance upon their occasional use in the 'view submissions grid'. Right now I'm suffering from &quot;white only&quot; issue (see my &quot;multi-yellow&quot; accounts, above). I ''am'' using Firefox, if that's indeed relevant to this issue, but right now I'm not near any other up-to-date browser I care to use. [[Special:Contributions/172.70.163.31|172.70.163.31]] 21:37, 7 April 2024 (UTC)<br /> :I'm getting the same issue with black holes (which probably makes more sense - put a black hole there and you'd expect everything else to disappear :o) - except that on one occasion I was able to put about 6 black holes in before the 7th one vanished everything.[[Special:Contributions/172.69.194.121|172.69.194.121]] 09:15, 8 April 2024 (UTC)<br /> <br /> Has anyone seen their own cell in the machine at all yet? A manual approval system is probably necessary for obvious reasons, but if so it does seem to be moving quite slowly.<br /> [[Special:Contributions/172.69.65.24|172.69.65.24]] 02:58, 8 April 2024 (UTC)<br /> <br /> I've never seen one of my own cells after refreshing the page. :( [[Special:Contributions/172.70.110.122|172.70.110.122]] 20:27, 12 April 2024 (UTC)<br /> <br /> How on earth is everyone seeing different parts of the grid? If I request &quot;view machine&quot; I can only see my own square, and the edges of everyone elses. Nothing else, definitely not all of the machine. [[Special:Contributions/172.68.64.149|172.68.64.149]] 21:11, 8 April 2024 (UTC)<br /> ::You should be able to click and drag the view around. [[Special:Contributions/172.71.242.54|172.71.242.54]] 21:41, 8 April 2024 (UTC)<br /> <br /> Whoever designed the room entirely full of fans is evil - every time I scroll near it my entire browser freezes up and becomes unresponsive. And then the comic usually blanks.[[;8Special:Contributions/172.69.194.81|172.69.194.81]] 08:23, 9 April 2024 (UTC)<br /> <br /> None of [https://www.explainxkcd.com/wiki/index.php?title=2916:_Machine&amp;diff=339487&amp;oldid=339486 these edits] were anything to do with &quot;grammar&quot;, so why would anyone describe the change as such? The spelling of &quot;colo(u)r&quot; is an internationali[s|z]ation issue, of note, and why I usually prefer to defer to using words like &quot;hue&quot;, instead, in such contexts on this site. The change of the link from &quot;The Incredible Machine&quot; (where the page exists) to &quot;The Credible Machine&quot; (where it doesn't, because that's really just this comic's own joke) I aready changed back... If you think it doesn't properly explain the pun/negation, then rewrite; but don't make it an invalid link to something that doesn't even exist, as you'd know if you had even followed the link(s). [[Special:Contributions/172.69.194.141|172.69.194.141]] 15:22, 12 April 2024 (UTC)<br /> <br /> Folks might be interested in my list of all published blueprints with their titles and permalinks: https://github.com/scpso/incrediblexkcd. scpso [[Special:Contributions/172.68.144.147|172.68.144.147]] 13:18, 14 April 2024 (UTC)<br /> <br /> == Level scrolling bug ==<br /> <br /> When one views the whole machine, and scrolls down far enough, everything just disappears, and the comic is completely unresponsive. Has anyone else seen this? [[Special:Contributions/198.41.236.152|198.41.236.152]] 20:38, 7 April 2024 (UTC)<br /> <br /> :I'm now seeing the same issue, I wasn't before. (I'm using Chrome) [[Special:Contributions/172.70.162.20|172.70.162.20]] 21:06, 7 April 2024 (UTC)<br /> <br /> ::A hard refresh appears to have fixed this for me (same person as above). [[Special:Contributions/141.101.99.101|141.101.99.101]] 10:28, 8 April 2024 (UTC)<br /> <br /> :I've been having this issue as well (I'm using firefox). Opening the site in Edge instead seemed to work around it for me, so it might only affect Firefox (and derivatives). [[Special:Contributions/172.70.163.31|172.70.163.31]] 21:27, 7 April 2024 (UTC)<br /> ::See also the 'firefox bug' comments currently immediately above this section. (Please don't ask me to start Edge up, I hate it, won't use it any more than the system requires me to...) [[Special:Contributions/172.70.163.31|172.70.163.31]] 21:37, 7 April 2024 (UTC)<br /> <br /> :Update - I did a hard refresh so I could play around with the new additions and I'm no longer encountering the bug, even on firefox. I think the &quot;white screen&quot; bug is fixed now and you just need to hard-refresh to download the fixed JS instead of using the cached one. (same person as 172.70.163.31 and 172.70.162.38) [[Special:Contributions/172.70.86.16|172.70.86.16]] 11:16, 8 April 2024 (UTC)<br /> <br /> ==New Category: Ball Pit?==<br /> <br /> What do you think about a new category for comics with [[ball pits]]? [[150]], [[219]], [[485]], [[498]], [[2916]]? [[Special:Contributions/162.158.134.229|162.158.134.229]] 21:50, 7 April 2024 (UTC)<br /> <br /> [[:Category:Playpen balls]] already exists.<br /> [[Special:Contributions/172.70.174.133|172.70.174.133]] 17:35, 9 April 2024 (UTC)<br /> <br /> == Prism Use? ==<br /> <br /> Can the prism be used to sort balls by color? (or in any other way that is useful and different?) [[Special:Contributions/172.68.34.61|172.68.34.61]] 12:11, 8 April 2024 (UTC)<br /> :From what I've seen, no. Though may be ''extremely'' susceptible to incident angle. As far as my own use has been, they seem to randomise the trajectory (possibly also do a total-internal-reflection, I've had balls bounce around and exit at ''really'' weird angles), but it's hard to collimate a feed of balls into a single exact track, even straight down from a ceiling-feed (if you have a ceiling feed directly over the floor exit, lucky you, it'll still occasionally perturb balls off to the sides just enough to be bounced out as a gate-miss, unless you add 'funnel' architecture of one kind or another). Oh, and when balls do a lot of 'internal bouncing' it often forced me to reload the comic (overloaded the physics engine?), so could not continue to tweak the same design.<br /> :On the other hand, perhaps this was the ''intent'', and just code/browser failings made it work erratically. Maybe would be an idea to go back and retest for this (anybody who can), do a little !!science!! to be recorded and explained on the page. [[Special:Contributions/172.69.43.183|172.69.43.183]] 12:51, 8 April 2024 (UTC)<br /> :So, ive did some testing and found..nothing. i ''did'' find some uses for the prism though. Like outting them diagonally makes the balls follow a &quot;path&quot;, speeding up more and more (not really that great but it works with yellows), and that any ball hitting the left edge will try to go the the right edge. Not sure what else it can do, though. [[User:Begocc|Begocc]] ([[User talk:Begocc|talk]]) 09:35, 10 April 2024 (UTC)<br /> ::I did some thorough testing on a combined Red/Blue set of balls (carefully managed so that they were dropping into the target area as similarly as possible) and both rotated and moved the prism in various ways to check for any effects - like needing to enter parallel/perpendicular to the colour-bands, either to land on the 'target band' or start to pass across it, with the band then either facilitating or angling its 'fall through'. (Just visually checked, at first, then later adding 'buckets' below and to the sides, to try to catch balls departing on various trajectories in various 'clumps' making note of any that hit the 'bucket'-boundaries and bounced off elsewhere.)<br /> ::I found no significant sorting, and some balls would jitter around so much (within the prism) that they even launched almost straight back up where they came from (less poerfully than a Bonk-buffered ball, but not far off - also not reliable enough to use as a ball-elevator).<br /> ::In my experience, Yellow-sorting is easy (even against Blue and/or Red) by other means. Green is the easiest to have everything else sorted ''from'' (because it resists the fan method). The hardest to unmix are Reds from Blues, which one might think ''should'' be the most prism-differentiated but I'm afraid I just can't invoke that. Easier to have them fall a long way then bounce off a suitable bit of 'furniture', I can then get them to distribute ''fairly'' distinctly in two handy recepticles/onward-feed-hoppers, though it does need some careful placement of items to do it justice. It appears that none of my designs have made it to the 'public wall', but I have made a submitable machine or two that does such sorting sufficiently successfully to send it out (theoretically) to be seen. [[Special:Contributions/172.70.163.30|172.70.163.30]] 11:38, 10 April 2024 (UTC)<br /> <br /> == Bugs and Exploits ==<br /> <br /> You can use a sword to break the physics on the hinge thingy and create your very own &quot;magnetic hill&quot;: https://imgur.com/a/IRZ0AlL [[Special:Contributions/162.158.134.108|162.158.134.108]] 13:02, 8 April 2024 (UTC)<br /> :Hard to tell from that what other fans (perhaps) you've got completely off-clip.<br /> :Those hinge-thingies can definitely be shifted by horizontal (outwith ball-weight pressures), but I've not found them to be reliable components as the &quot;Stop&quot; button (ball reset) seems to let those 'hinges' slring back to level, which might need a re-reset by moving them back past the thing that's holding them off-level.<br /> :I have tried a few things with them:<br /> :*'Ticker' mechanism, almost like a clock escapement, nudged by the rotating 'waterwheel', perhaps to try to release balls through a stream of other balls whilst keeping the path clear of collisions for each set, in turn.<br /> :*'Batch dumper', accumulating a number of balls (above the 'hinge', behind a vertical bulkhead) until there's weight enough to 'open the hatch' and roll them out. (Again, an attempt to reduce collisions, by clumping batches together).<br /> :*Finely configured inclines, by shoving something up into a free end of hinge with better angular resolution (but, as mentioned, this doesn't seem to want to 'hold', so probably would fail upon submission).<br /> :...I had wondered if there was supposed to be a &quot;falling anvil creates a catapult/ballista&quot; idea behind the piece, but we don't ''have'' falling anvils (and definitely not in a repeating manner), and ball-powered catapult (esssentially &quot;clown/acrobat jumps on one end of seesaw, clown/acrobat on other end flies up into the air&quot;) also doesn't seem practical.<br /> :I'll try to recreate ''your'' design, work out if there's anything new about it, but right now looks like it's a fan-powered incline-raiser. [[Special:Contributions/172.70.162.38|172.70.162.38]] 14:23, 8 April 2024 (UTC)<br /> :: No fans! Here's a wider view: https://imgur.com/a/xPJcsor<br /> :: It survives the reset, because the balls falling on the lever push it down to the sword and it gets stuck there every time. But you need to place the sword just right to make the gravity bug happen. And even then it depends on the number of balls in some ways. [[Special:Contributions/172.68.243.27|172.68.243.27]] 14:46, 8 April 2024 (UTC)<br /> ::: I've replicated the &quot;tip of sword grabs the 'hinge'&quot; thing, which is very interesting, but not the anti-gravity effect. The movement still seems ''to me'' more like a fan's 'area of effect' thing, than a wonky sense of gravity, the way that the balls are rolling/resisting/interacting with each other. No, I can't see where you've 'hidden' the fan (and I'm sure that fans can't act across submission-grid-boundaries, which was my next guess), so it's a bit of a funny thing that you've got there. [[Special:Contributions/172.70.163.49|172.70.163.49]] 21:35, 9 April 2024 (UTC)<br /> <br /> On occasion, two balls will fall from the containers as a pair, as if glued together. When this happens, they float down as if under much lower gravity, and then suddenly explode violently away from each other.[[Special:Contributions/172.69.43.182|172.69.43.182]] 10:56, 10 April 2024 (UTC)<br /> What contaniners?? [[Special:Contributions/172.70.110.252|172.70.110.252]] 14:58, 12 April 2024 (UTC)<br /> == The USS Buoyancy ==<br /> <br /> Guys. The Buoyancy. She ''floats''. When all four sets of balls reach the ball pit there aren't further additions. The boat starts floating on them. I've been watching it for a while. It seems she moves left and will probably end up escaping the ball pit. [[User:DL Draco Rex|DL Draco Rex]] ([[User talk:DL Draco Rex|talk]]) 20:44, 8 April 2024 (UTC)<br /> :Update: A new row spawned in and it reset just before the Buoyancy could escape. Here's a screenshot I grabbed a while before the reset, she'd moved further left by the time the reset occurred. https://imgur.com/gallery/8UCASCu [[User:DL Draco Rex|DL Draco Rex]] ([[User talk:DL Draco Rex|talk]]) 20:51, 8 April 2024 (UTC)<br /> <br /> Alright, I'm almost 100% of the time seeing Buoyancy sink. Yes, she *floats* at first. But as she drifts to the sides, instead of yellows going underneath, reds and greens pile on top. Then, as the balls under expire (90 second timeout), she will start to sink. Very consistent behavior over time.<br /> [[User:Keybounce|Keybounce]] ([[User talk:Keybounce|talk]]) 19:20, 11 April 2024 (UTC)<br /> <br /> What is the Bouaancy i cant find it anywhere??? [[Special:Contributions/172.70.110.252|172.70.110.252]] 14:58, 12 April 2024 (UTC)<br /> == Added key combinations, found in source ==<br /> <br /> ctrl+alt+b<br /> ctrl+shift+option+d<br /> wheel: arrow keys<br /> <br /> : Can you clarify what &quot;option&quot; is? I have tried alt, function, and &quot;operating system&quot;, and none are doing it.<br /> It is alt [[Special:Contributions/172.70.110.252|172.70.110.252]] 14:58, 12 April 2024 (UTC)<br /> == Fixed Number of Possible Machinelets? ==<br /> <br /> I was resetting my browser to try and find new machinelet configurations, but there seem to be fewer and fewer as the game progresses. Hypothesis: the 'under construction' machinelets are set, and once one of them gets approved and added to the grid, that specific configuration of entrances/exits can't show up again.<br /> <br /> == Advanced components? ==<br /> <br /> How does one get access to the full set of components to build from? I'm only given planks, mallets, swords, scoops, anvils, bricks and fans. I never get any pillows, bumpers, cats, stick figures et cetera. Do they need to be &quot;unlocked&quot; through some achievement, or what? [[Special:Contributions/162.158.222.102|162.158.222.102]] 11:04, 9 April 2024 (UTC)<br /> <br /> This caught me for a while as well. I have since discovered that the tool box has a scroll bar and can be scrolled down; that's where the others are hiding.<br /> ::Invisible scrollbars – every GUI obfuscator's favorite tool for making users' lives harder. [[Special:Contributions/162.158.222.142|162.158.222.142]] 18:17, 9 April 2024 (UTC)<br /> <br /> == Limit of 100 components? ==<br /> <br /> Has anyone else seen this? At some point I started getting a count &quot;95 / 100&quot; towards the bottom of the toolbar. When it hits &quot;100 / 100&quot; the rest of the toolbar greys out, and I can't add anything more. (I suppose the physics engine has to keep a ceiling on the number of possible interactions between components.) —[[User:Scs|Scs]] ([[User talk:Scs|talk]]) 11:53, 10 April 2024 (UTC)<br /> :Yes, quite early on I was dealing with a quite simple 'drop from ceiling straight down to floor' setup. After adding just enough 'funnel' to deal with 'splatter', I then built a castle wall in the open space just to make it fun (with some figures on/below it, that I've also tried to decorate in later submissions), of the 'grey blocks'.<br /> :I actually hit the 100/100 ''exactly'' as I placed my final intended block. (No doubt that it's easy to hit the limit by just overlapping things so you can't see most of them, and other 'useless' placement, too...) [[Special:Contributions/172.70.85.48|172.70.85.48]] 19:57, 10 April 2024 (UTC)<br /> <br /> == uss boyancy ==<br /> <br /> Why have i not been seeing any uss boyancy [[Special:Contributions/172.70.110.122|172.70.110.122]] 14:04, 10 April 2024 (UTC)<br /> <br /> Haha I dare you to go to https://xkcd.com/2916/#xt=7&amp;yt=57 and stare at the two black holes next to eachother &gt;:) [[User:Z1mp0st0rz|Z1mp0st0rz]] ([[User talk:Z1mp0st0rz|talk]]) 15:27, 10 April 2024 (UTC)<br /> <br /> == Build a &quot;working&quot; machine from parts? ==<br /> <br /> Has anyone started working on this idea:<br /> <br /> Since any given machine segment seems to be saved, even if not in the final result, *and* since these segments are failing when combined in the whole, how about a &quot;really working&quot; machine that starts replacing failing segments when they jam or otherwise fail to work in the real machine?<br /> <br /> The idea being something like, start the machine. Watch the top row, and see where the parts are failing to pass balls properly after two minutes. Replace the segments that are failing/jaming/etc, and let the new part process balls.<br /> <br /> As you work your way down, over about 2 hours at the current size, you will eventually get a machine that properly sends balls down to the bottom, without jamming, without having to &quot;pretend&quot; that off-screen parts are working.<br /> <br /> I mean, it's not like a gigantic, 600 segment machine will overflow memory on modern 32gb systems, nor consume so much power that these big huge CPU's will fail, right?<br /> There is a 100 piece limit sadly<br /> [[User:Keybounce|Keybounce]] ([[User talk:Keybounce|talk]]) 17:41, 10 April 2024 (UTC)<br /> ps.: Why do white holes, black holes, prisms, etc, cause problems on some machines like mine and not others?<br /> <br /> == Foreshadowing ==<br /> <br /> I think that this Machine comic / game is foreshadowed by comic # 2785 titled Marble Run. {{unsigned ip|172.70.130.120|22:15, 11 April 2024}}<br /> <br /> == Implementation? ==<br /> <br /> Should we have a section on how this thing is implemented? How much is known? Obviously it's hugely dependent on [https://rapier.rs/ Rapier], as credited in the header text. I assume everything else is written in {{w|Rust (programming language)|Rust}}, too. But how is it deployed? Does Rust compile to {{w|Web Assembly}}, or what? Under Color Routing, our explanation mentions that the ball &quot;values were extracted from the code&quot; — how much of the code is actually visible? —[[User:Scs|Scs]] ([[User talk:Scs|talk]]) 16:39, 12 April 2024 (UTC)</div>

172.68.144.147 https://www.explainxkcd.com/wiki/index.php?title=Talk:2904:_Physics_vs._Magic&diff=338098 2024-03-25T12:20:23Z

<p>172.68.144.147: </p> <hr /> <div>&lt;!--Please sign your posts with ~~~~ and don't delete this text. New comments should be added at the bottom.--&gt;<br /> Isn't the first law of thermodynamics a conservation law? [[Special:Contributions/172.69.134.217|172.69.134.217]] 21:27, 8 March 2024 (UTC)<br /> <br /> In Lagrangian Mechanics,the Lagrangian is a function of time, position and speed. The action of the system is defined as the integral of the Lagrangian between the initial and final time. Movement equations are derived as those that minimize action. In that sense it can be loosely interpreted that by only setting initial condition and outcome you can get the full picture of all intermediate events. [[Special:Contributions/198.41.230.215|198.41.230.215]] 22:46, 8 March 2024 (UTC)<br /> <br /> This is why statistics is magical [[User:Phlaxyr|Phlaxyr]] ([[User talk:Phlaxyr|talk]]) 23:33, 8 March 2024 (UTC)<br /> <br /> <br /> Both thermodynamics and conservation laws make predictions without telling us anything about what exactly is happening in the intermediate steps. In that sense they're no different from the curse in the comic. An example for thermodynamics could be: your coffee cup will get cold if left on your desk (zeroth law). And an example from conservation laws could be: it doesn't matter what method you're going to use to stop a moving car, in all cases the car has lost the same amount of energy (1/2mv^2). [[Special:Contributions/141.101.99.110|141.101.99.110]] 00:33, 9 March 2024 (UTC)<br /> <br /> I've always been a little bit annoyed by thermodynamics. I mean it has a temperature, it has energy, why can't I have the energy without something colder lying around? &quot;Remove heat energy from this object and charge a battery with it&quot;... It sucks because the inverse is true, I can certainly discharge a battery and make heat energy from chemical... Anyway back on topic, can someone magic me such a device? I promise to share 50% of the big oil hush money. [[Special:Contributions/172.68.210.23|172.68.210.23]] 04:04, 9 March 2024 (UTC)<br /> :What exactly would be your contribution? Anyone with such device would be already swimming in money from U.S. department of defense. Or, more likely, killed by them. Because it certainly can be used as a bomb. -- [[User:Hkmaly|Hkmaly]] ([[User talk:Hkmaly|talk]]) 20:48, 9 March 2024 (UTC)<br /> :: Anonymity. With magic up their sleeve they probably want to solve a few more world problems too, this allows them to get one out of the way without drawing attention to themselves. [[Special:Contributions/172.68.210.73|172.68.210.73]] 01:17, 10 March 2024 (UTC)<br /> <br /> The talk had a better explanation of why Thermodynamics, Conservation laws and Lagrangians are 'magic' than the actual explanation. I added a few paragraphs briefly explaining to the explanation, I hope that's helpful, but I left the paragraph about scientific laws being empirical themselves in place despite the fact that I'm pretty dubious about whether that's actually part of the joke. [[Special:Contributions/141.101.99.111|141.101.99.111]] 16:46, 9 March 2024 (UTC)<br /> :: To be frank I just think part of the joke is how naive definitions of science can lead to baffling counterexamples [[Special:Contributions/198.41.230.214|198.41.230.214]] 08:03, 10 March 2024 (UTC)<br /> <br /> <br /> &lt;br&gt;<br /> &lt;br&gt;<br /> <br /> '''About the stationary action concept''' <br /> <br /> At first sight it looks as if Hamilton's stationary action implies some form of teleology. On closer inspection that turns out not to be the case.<br /> <br /> I will use the following case as example of application of calculus or variations in physics: the [https://en.wikipedia.org/wiki/Catenary catenary] problem. The properties of the catenary problem that make it lend itself to variational treatment generalize to other areas of physics in which calculus of variations is applied<br /> <br /> Take a catenary and divide it into subsections. Here's the thing: each of those subsections is an instance of the catenary problem. The ''ratio'' of horizontal and vertical displacement is different for each subsection, of course, but that is not an obstacle. <br /> <br /> Solving the catenary problem with calculus of variations consists of the following: you subdivide the total length in infinitesimally small subsections. You then set up an equation that addresses all subsections concurrently. <br /> <br /> That equation-for-every-infinitesimal-subsection-concurrently is the Euler-Lagrange equation. You solve the problem by restating the equation as a ''differential equation''.<br /> <br /> A differential equation is non-local in the sense that to solve the problem you require that the equation is to be satisfied over the whole domain ''concurrently''.<br /> <br /> The derivation of the Euler-Lagrange equation is a generic derivation. That is, the result of that derivation is applicable for ''any'' problem that is stated in variational form.<br /> <br /> Stating a problem in variational form means that it is stated as an integral. (In the case of the catenary problem that integral is the integral of the potential energy from one point of suspension to the next point of suspension.) The problem statement is then: which curve has the property that for that curve the ''derivative'' of the integral of the potential energy is zero.<br /> <br /> In the case of the catenary problem: &lt;br&gt;<br /> The integral is integration with respect to the horizontal coordinate. The variation that is applied is perpendicular to that; the variation is applied in the ''vertical'' direction. The derivative-is-zero criterion is for the derivative of the integral with respect to that ''vertical'' direction. <br /> <br /> &lt;br&gt;<br /> <br /> Key to the derivation of the Euler-Lagrange equation is that it works towards the goal of transforming the integral expression to a differential expression. That is essential: in order to make progress the integration must be replaced with differentiation.<br /> <br /> The result of the transformation, the Euler-Lagrange equation, imposes a constraint that is just as demanding as the initial formulation with an integral. The differential equation is to be satisfied concurrently over the whole domain.<br /> <br /> There is a derivation of the Euler-Lagrange equation that just skips stating the integral; it goes straight to the differential expression. [https://preetum.nakkiran.org/lagrange.html Geometric derivation of the Euler-Lagrange equation] Author: Preetum Nakkiran. <br /> <br /> (Preetum Nakkiran uses the catenary problem as motivating example, the result has general validity.)<br /> <br /> Further reading: discussion of Hamilton's stationary action in an answer I submitted to physics.stackexchange: [https://physics.stackexchange.com/a/670705/ Hamilton's stationary action]<br /> <br /> &lt;br&gt;<br /> <br /> '''The relation between Newtonian mechanics and conservation of energy'''<br /> <br /> We have that in order to formulate a theory of mechanics we must at minimum use these three quantities: position, velocity, acceleration. These three are in a cascading relation: velocity is the time derivative of position, acceleration is the time derivative of velocity.<br /> <br /> v = ds/dt, a = dv/dt &amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp; (1)<br /> <br /> In the case of uniform acceleration from a starting velocity of zero we have: &lt;br&gt;<br /> v = at &amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp; (2) &lt;br&gt;<br /> s = &amp;frac12;at&amp;sup2; &amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp; (3)<br /> <br /> Take (3), multiply both sides with acceleration ''a'', and substitute according to (2):<br /> <br /> as&amp;nbsp;=&amp;nbsp;a&amp;frac12;at&amp;sup2;&amp;nbsp;=&amp;nbsp;&amp;frac12;a&amp;sup2;t&amp;sup2;&amp;nbsp;=&amp;nbsp;&amp;frac12;(at)&amp;sup2;&amp;nbsp;=&amp;nbsp;&amp;frac12;v&amp;sup2;<br /> <br /> as&amp;nbsp;=&amp;nbsp;&amp;frac12;v&amp;sup2;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;(5)<br /> <br /> The relation (5) is known as Torricelli's formula. &lt;br&gt;<br /> In case the initial position coordinate and the initial velocity are non-zero the derivation works out as follows: &lt;br&gt;<br /> v&amp;nbsp;-&amp;nbsp;v&amp;#8320;&amp;nbsp;=&amp;nbsp;at&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;(6) &lt;br&gt;<br /> s&amp;nbsp;-&amp;nbsp;s&amp;#8320;&amp;nbsp;=&amp;nbsp;v&amp;#8320;t&amp;nbsp;+&amp;nbsp;&amp;frac12;at&amp;sup2;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;(7) &lt;br&gt;<br /> Multiply all terms of (7) with acceleration ''a'': &lt;br&gt;<br /> a(s&amp;nbsp;-&amp;nbsp;s&amp;#8320;)&amp;nbsp;=&amp;nbsp;av&amp;#8320;t&amp;nbsp;+&amp;nbsp;a&amp;frac12;at&amp;sup2;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;(8) &lt;br&gt;<br /> a(s&amp;nbsp;-&amp;nbsp;s&amp;#8320;)&amp;nbsp;=&amp;nbsp;v&amp;#8320;(at)&amp;nbsp;+&amp;nbsp;&amp;frac12;(at)&amp;sup2;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;(9) &lt;br&gt;<br /> a(s&amp;nbsp;-&amp;nbsp;s&amp;#8320;)&amp;nbsp;=&amp;nbsp;v&amp;#8320;(v&amp;nbsp;-v&amp;#8320;)&amp;nbsp;+&amp;nbsp;&amp;frac12;(v&amp;nbsp;-v&amp;#8320;)&amp;sup2;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;(10) &lt;br&gt; <br /> a(s&amp;nbsp;-&amp;nbsp;s&amp;#8320;)&amp;nbsp;=&amp;nbsp;vv&amp;#8320;&amp;nbsp;-&amp;nbsp;v&amp;#8320;&amp;sup2;&amp;nbsp;+&amp;nbsp;&amp;frac12;v&amp;sup2;&amp;nbsp;-&amp;nbsp;vv&amp;#8320;&amp;nbsp;+&amp;nbsp;&amp;frac12;v&amp;#8320;&amp;sup2;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;(11) &lt;br&gt;<br /> a(s&amp;nbsp;-&amp;nbsp;s&amp;#8320;)&amp;nbsp;=&amp;nbsp;&amp;frac12;v&amp;sup2;&amp;nbsp;-&amp;nbsp;&amp;frac12;v&amp;#8320;&amp;sup2;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;(12) &lt;br&gt;<br /> <br /> Next we go to the more general case of allowing non-uniform acceleration. Interestingly, the result of the integration is identical to (12).<br /> <br /> &amp;int;&amp;nbsp;a&amp;nbsp;ds&amp;nbsp;=&amp;nbsp;&amp;frac12;v&amp;sup2;&amp;nbsp;-&amp;nbsp;&amp;frac12;(v&amp;#8320;)&amp;sup2;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;(13)<br /> <br /> (To understand (13): we have that integration is summation of infinitesimal strips. The integration consists of concatenating instances of (12), in the limit of infinitesimal increments. All of the in-between terms drop away against each other, resulting in (13))<br /> <br /> &lt;br&gt;<br /> <br /> The work-energy theorem is obtained as follows: start with ''F''=''ma'', and integrate both sides with respect to the position coordinate. <br /> <br /> &amp;int;&amp;nbsp;F&amp;nbsp;ds&amp;nbsp;=&amp;nbsp;&amp;int;&amp;nbsp;ma&amp;nbsp;ds&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;(14)<br /> <br /> Use (13) to process the right hand side:<br /> <br /> &amp;int;&amp;nbsp;F&amp;nbsp;ds&amp;nbsp;=&amp;nbsp;&amp;frac12;mv&amp;sup2;&amp;nbsp;-&amp;nbsp;&amp;frac12;m(v&amp;#8320;)&amp;sup2;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;(15)<br /> <br /> (15) is the work-energy theorem<br /> <br /> The work-energy theorem is the reason that it is useful to formulate the concepts of potential energy and kinetic energy. If we formulate potential energy and kinetic energy in accordance with the work-energy theorem then we have that the sum of potential energy and kinetic energy is a conserved quantity.<br /> <br /> The work-energy theorem consists of two elements: ''F''=''ma'', and (13).<br /> <br /> Here (13) was stated in terms of the familiar quantities of mechanics: position, velocity, acceleration. (13) generalizes to any set of three quantites that features that cascading relation: state, first time derivative, second time derivative.<br /> <br /> Example: electric current and electromotive force in an LC circuit&lt;br&gt;<br /> Amount of current is a first derivative (displacement of charge per unit of time)&lt;br&gt;<br /> ''Change'' of current strength is a second derivative &lt;br&gt;<br /> For current through an inductor: the rate of change of current strength (second time derivative) is proportional to the electromotive force. &lt;br&gt;<br /> So we see that in the case of an LC circuit the elements necessary to result in a conservation property are present. &lt;br&gt;<br /> [[User:Cleonis|Cleonis]] ([[User talk:Cleonis|talk]]) 11:50, 10 March 2024 (UTC)<br /> <br /> Thinking further on this, I believe part of the apparent strangeness of the Lagrangian formalism is the fact that the system state is specified at both ends forces you into thinking 'backwards in time' in a way that you don't have to in the Newtonian formalism, but the Newtonian formalism is quite happy to infer the past state from the future and give sensible answers if you integrate backwards in time. So in that sense it's true to say that the Lagrangian formalism implies no more teleology than the Newtonian formalism, but only because the unsettling backwards propagation of cause and effect is actually hidden in the Newtonian approach too. Maybe the interesting thing here is a connection between entropy, whence we get a distinction between past and future, and the philosophical notion of 'purpose' or 'ends' or whatever the term in teleology is. I'm not a philosopher (nor a physicist) so forgive me if I'm mischaracterizing teleology. [[Special:Contributions/172.71.178.177|172.71.178.177]] 19:25, 10 March 2024 (UTC)<br /> <br /> : I concur that assumption of some form of teleology is not in any way necessary.<br /> <br /> : Chad Orzel, discussing Lagrangian formalism, offered a comparison. Let's say we have a train traveling to a destination at a constant velocity. We can state that case as an ''initial value problem'' as follows: the train travels at a velocity of 100 units of distance per hour. That constraint determines how much ''time'' it will take to reach a destination that is 100 units of distance away. We can state that case as a ''boundary value problem'' as follows: at one hour from t=0 the train must arrive at a destination that is 100 units of distance away. That constraint determines what the ''velocity'' must be.<br /> <br /> : Next we introduce a potential, the potential introduces an acceleration profile to the case. When the problem is stated as an initial value problem we use the given initial velocity (and given acceleration profile) to extrapolate what the arrival time will be. When the case is stated as a boundary value problem we do what is effectively an interpolation: we infer which initial velocity will produce that travel duration of 1 hour.<br /> <br /> : I used used the words 'extrapolation' and 'interpolation' because of their common element, of course. The element 'polation' is related to words such as 'polished'. A physical trajectory is free from discontinuity. Extrapolation and interpolation have in common that they capitalize on continuity. Calculation can proceed in any direction; that does not imply anything about causality. [[User:Cleonis|Cleonis]] ([[User talk:Cleonis|talk]]) 22:43, 10 March 2024 (UTC)<br /> <br /> We haven't seen anything about daylight savings time yet... maybe we'll see one tomorrow... why am i eepy during the middle of the day... -- megan &lt;sup&gt;she&lt;/sup&gt;/&lt;sub&gt;her&lt;/sub&gt; &lt;sup&gt;[[user talk:megan|talk]]&lt;/sup&gt;/&lt;sub&gt;[[special:contribs/megan|contribs]]&lt;/sub&gt; 23:01, 10 March 2024 (UTC)<br /> <br /> Conservation laws and Lagrangian refer to their role in particle physics. For example, conservation of electrical charge is simply postulated as something that your theory should satisfy, but physics does not tell us why it is there in the first place (hence: magic). Similarly, Lagrangians are usually formulated in a way that the outcomes are compatible with experimental observations and not starting out based on fundamental principles. The statement &quot;Lagrangian mechanics instead takes the initial and final states of a system as inputs&quot; is wrong by the way. The Euler-Lagrange equation yields a differential equation that is usually solved as an initial value problem, as it is done in Newtonian mechanics. {{unsigned ip|172.70.110.144|07:38, 11 March 2024}}<br /> <br /> Probably not the clearest way to put that I suppose, but while the Euler-Lagrange equations might not take initial and final states as inputs, the least action principle from which they are derived is formalised that way, at least insofar as it takes the generalized coordinates at each end of an interval and gives a rule for the evolution between them. The fact that in practice you usually grind the Lagrangian into ELEs in order to solve it doesn't mean that there's anything stopping you doing it directly by, say, discretizing the interval to turn the action integral into a form you can minimize directly. I still think that the least-action principle from classical mechanics makes much more sense as the root for this joke than their use specifically in particle physics. [[Special:Contributions/172.70.86.189|172.70.86.189]] 17:50, 14 March 2024 (UTC)<br /> <br /> : Sure, it is possible to implement stationary action numerically. For instance, around 2003 Edwin F. Taylor and Jozef Hanc collaborated on a series of articles, and Slavomir Tuleja created a Java simulation in which the concept of 'hunting for the true trajectory' is implemented. (I created a numerical implementation too, it's on my website.) In order to home in on the true trajectory an iterative algorithm must be implemented. The total time interval is subdivided in ''n'' time intervals: t_1, t_2, t_3, t_4, ... t_n. As seed for the iterations start with a straight line. First iteration: adjust the height at t_2, while keeping the height at t_1 and t_3 the same; next adjust the height at t_3, while keeping the height at t_2 and t_4 the same, and so on until you are at t_n. Start again with the triplet t_1, t_2, t_3. Keep iterating until the vertical increments become negligably small. In the Tuleja applet the size of the time increment is adjustable. The smaller the time increments the higher the accuracy of the numerical approximation. My point is: in the end the only distinction between implementing a differential solver and implementing a stationary action solver is order of operations; in both cases the ''unit of operation'' is inherently a ''differential operation''. To push for higher accuracy you must make the time increments smaller. General assertion: contrary to its appearance the stationary action concept is ''inherently'' a differential concept [[User:Cleonis|Cleonis]] ([[User talk:Cleonis|talk]]) 10:04, 17 March 2024 (UTC) <br /> <br /> <br /> <br /> I feel like this explanation needs a Simple English rewrite. The introduction is ok, but I came here with the simple question &quot;What are Lagrangians?&quot; and the sci-speak is so opaque it might as well be just &quot;magic&quot;. [[Special:Contributions/172.70.91.61|172.70.91.61]] 20:03, 15 March 2024 (UTC)<br /> :Langrangian: [https://darthsanddroids.net/episodes/0003.html a kind of sofa with a double cup-holder...] ;) [[Special:Contributions/172.71.242.29|172.71.242.29]] 21:58, 15 March 2024 (UTC)<br /> <br /> No comment on the &quot;falls out of&quot; terminology for the Lagrangian? It's been yonks since I learnt anything to do with Lagrangians, and I can't say I ever mastered them, but I remember the solution &quot;falling out of&quot; the equations being a feature. [[Special:Contributions/172.68.144.147|172.68.144.147]] 12:20, 25 March 2024 (UTC)</div>

172.68.144.147 https://www.explainxkcd.com/wiki/index.php?title=2908:_Moon_Armor_Index&diff=337997 2024-03-22T23:35:57Z

<p>172.68.144.147: /* The complexities of armor thickness calculations */ add note about what happens if the moon material sinks into a gaseous planet</p> <hr /> <div>{{comic<br /> | number = 2908<br /> | date = March 18, 2024<br /> | title = Moon Armor Index<br /> | image = moon_armor_index_2x.png<br /> | imagesize = 740x390px<br /> | noexpand = true<br /> | titletext = Astronomers are a little unsure of the applicability of this index, but NASA's Planetary Protection Officer is all in favor.<br /> }}<br /> <br /> ==Explanation==<br /> {{incomplete|Created by a MARS ROVER THAT GREW 2 INCHES OVERNIGHT - Please change this comment when editing this page. Do NOT delete this tag too soon.}}<br /> <br /> In this “What If?”-style comic, [[Randall]] hypothesizes an imaginative situation in which each planet's moon(s) become converted into protective armor (as a form of {{w|Overburden#Analogous uses|overburden}}) to coat the respective planet. For example, the {{w|Moon}} would coat {{w|Earth}} in a 43 kilometer layer if it were molded into protective armor, almost five times the height of {{w|Mount Everest}}. <br /> <br /> This visual index illustrates that the moons of both Earth and Pluto are unusually massive in comparison to their planet. The large relative size of Earth’s moon — and its protective role in deflecting asteroids — is one reason that’s been suggested by astronomers for why intelligent life successfully evolved on Earth.<br /> <br /> Mars's moons {{w|Phobos (moon)|Phobos}} and {{w|Deimos (moon)|Deimos}} are small compared to Mars, so they would contribute a thin 2-inch layer of 'armor' around Mars, in contrast to the 20-inch (0.5&amp;nbsp;m) diameter of a {{w|Mars rover}} wheel. Huge Jupiter would be covered with almost 3 km of &quot;moon&quot; matter, which indicates just how much moon mass orbits Jupiter, a situation mostly similar for Saturn, Uranus, and Neptune.<br /> <br /> Six trans-Neptunian {{w|dwarf planet}}s and dwarf planet candidates are included, as well: Only Pluto, having a moon ({{w|Charon (moon)|Charon}}) of a comparable size to its planet, would have a layer thicker than Earth's. {{w|120347 Salacia|Salacia}}, {{w|Haumea}}, {{w|50000 Quaoar|Quaoar}}, {{w|225088 Gonggong|Gonggong}} and {{w|Eris (dwarf planet)|Eris}} are among the {{w|List of trans-Neptunian objects#List|ten largest such objects}}. (Two dwarf planets with moons — {{w|Makemake}} and {{w|90482 Orcus|Orcus}} — are not mentioned in the comic, but would be similarly depicted.)<br /> <br /> The title text states that astronomers are &quot;unsure&quot; about the applicability of this index, a joking understatement that imagines this comic as being a serious contribution to astronomical academic knowledge. Astronomers might also point out additional issues:<br /> * wariness of {{w|Giant-impact hypothesis|moons and planets getting too close}}.<br /> * moons already serve a protective purpose by deflecting and even intercepting some incoming asteroids (with a ''slight'' chance of turning a future miss into a hit).<br /> * the four gas giants — Jupiter, Saturn, Uranus, and Neptune — lack a solid surface to practically sustain a layer of armor without even ''more'' ambitious engineering than the already complicated process of somehow distributing soft-landed fragments of disassembled satellite evenly all across a planet.<br /> * although the coating would provide some protection to the underlying surface on which it was placed, it would effectively become part of the planet, and raise the surface. The things we would normally care about protecting, such as any life forms that exist, would be forced to relocate to this new surface, and therefore not benefit from any protection, while suffering significant detrimental impact to habitats, etc.<br /> <br /> The title text continues that NASA's [https://what-if.xkcd.com/117/ Planetary Protection Officer] is purportedly in favor of the idea. In reality, this officer is actually responsible for keeping other celestial bodies safe from Earth's contamination, not for shielding planets in armor. Theoretically, though, armoring other planets could indeed protect them from further Earth-sourced contamination, and armoring Earth would also theoretically protect other planets by burying the biosphere and all of Earth life not already sent into space — a potentially civilization-smothering action, though a surprisingly unapocalyptic result compared to many of Randall’s “What If?” scenarios.<br /> <br /> {| class=&quot;wikitable&quot;<br /> |-<br /> ! Planet/&lt;br&gt;dwarf planet !! Surface area (km²) || Moons || Total volume (km³) || Moon shield thickness &lt;!-- please add more info --&gt;<br /> |-<br /> | {{w|Earth}} || 5.1007*10^8 || {{w|Moon|1}} || 2.196*10^10 || 43&amp;nbsp;km (27&amp;nbsp;mi)<br /> |-<br /> | {{w|Mars}} || 1.4437*10^8 || {{w|Moons of Mars|2}} || {{w|Phobos (moon)|(5695±32)}}+{{w|Deimos (moon)|(1033±19)}} || 5&amp;nbsp;cm (2&amp;nbsp;in)<br /> |-<br /> | {{w|Jupiter}} || 6.1469*10^10 || {{w|Moons of Jupiter|95}} || 1.7646*10^11 || 2.87&amp;nbsp;km (1.78&amp;nbsp;mi)<br /> |-<br /> | {{w|Saturn}} || 4.27*10^10 || {{w|Moons of Saturn|146}} || 7.651*10^10 || 1.79&amp;nbsp;km (1.11&amp;nbsp;mi)<br /> |-<br /> | {{w|Uranus}} || 8.1156*10^9 || {{w|Moons of Uranus|28}} || || <br /> |-<br /> | {{w|Neptune}} || 7.6187*10^9 || {{w|Moons of Neptune|16}} || || <br /> |-<br /> | {{w|Pluto}} || 1.7744*10^7 || {{w|Moons of Pluto|5}} || {{w|Charon (moon)|(9.322×10^8)}}+{{w|Moons of Pluto|(approx 87100+38800+900+200)}} || 52.5&amp;nbsp;km (32.6&amp;nbsp;mi) (by this comic's approximation)<br /> 50.4&amp;nbsp;km (31.3&amp;nbsp;mi) (by full calculation)<br /> |-<br /> | {{w|120347 Salacia|Salacia}} || 2.27*10^6 || {{w|Actaea (moon)|1}} || 1.41*10^7 || 6.21&amp;nbsp;km (3.85&amp;nbsp;mi)<br /> |-<br /> | {{w|Haumea}} || 8.14*10^6 || {{w|Moons of Haumea|2}} || {{w|Hiʻiaka (moon)<br /> |(17.2*10^6)}}+{{w|Namaka (moon)|(2.57*10^6)}} || 2.43&amp;nbsp;km (1.51&amp;nbsp;mi)<br /> |-<br /> | {{w|50000 Quaoar|Quaoar}} || 3.78*10^6 || {{w|Weywot|1}} || 4.19*10^6 || 1.11&amp;nbsp;km (0.69&amp;nbsp;mi)<br /> |-<br /> | {{w|225088 Gonggong|Gonggong}} || || {{w|Xiangliu (moon)|1}} || || <br /> |-<br /> | {{w|Eris (dwarf planet)|Eris}} || (1.70±0.02)*10^7 || {{w|Dysnomia (moon)|1}} || || <br /> |}<br /> <br /> ===Implications of choosing a volume-to-area ratio===<br /> The usual means of comparing a moon to a planet might be to compare the volume of both. This comic compares moon volume (kilometers cubed) to planet surface area (kilometers squared); specifically, the index derives a ''linear'' indicator (the thickness of the new material) by dividing the ''area'' of the main body (proportional to the square of its uncounted radius) into the ''combined volume'' of all other bodies (proportioned cubes of their own radii), which gives an unusual dimensional analysis (dividing X kilometers-cubed by Y kilometers-squared gives a length, Z, in kilometers, not a simple dimensionless ratio).<br /> <br /> This particular methodology makes the Pluto-Charon system (Charon being roughly half the diameter and one-eighth the volume of Pluto, before even adding that of the other moons) surprisingly similar to the Earth-Moon one (our sole Moon is around one-quarter Earth's diameter, and therefore less than 2% its volume; also in comparison, the Earth and Moon are respectively slightly more than 150 times and around 3 times the volume of Pluto), but leaves them ''both'' as still standing out significantly against all other planetary comparisons, even against comparably-sized 'planet's.<br /> <br /> ===The complexities of armor thickness calculations===<br /> The comic uses the ≈ sign to show that the formula is only an approximation: it does not take account the increase in armor surface area as it gets thicker. This approximation would be perfect for a shield of thickness zero, but for the thickest shield (Pluto) around a small celestial body the error is around 4% (52.5&amp;nbsp;km by this approximation, but 50.4&amp;nbsp;km by more thorough calculation). To find the correct value, we can use the formula for the volume of a sphere, V = 4/3 * pi * r³ (where V is the volume and r is the radius). Using this formula, we can find and add together the volumes of each moon, as well as the volume of the planet, to get a total volume of the new shielded planet. Then we can find its radius using the formula r = (V / (4/3 * pi))&lt;sup&gt;⅓&lt;/sup&gt;, derived from the previous formula. Subtracting the radius of the previous planet from the radius of the new planet gives us the thickness of the armor.<br /> <br /> This process described above assumes that all objects involved are completely spherical, which may not be the case. The act of tearing apart a solid moon, perhaps into rough gravel, might add microvoids to the new layering that bulk up the volume slightly. But neither are gravitational compression effects taken into account on an originally loose material; the planet's gravitational pull could settle some of the moon material into a slightly smaller volume than the one it occupied as lower-gravity moon.<br /> <br /> The planet below could also be marginally affected by the change in its total planet-and-armor mass, for rocky planets mostly within any {{w|pedosphere}} or previously exposed outer {{w|lithosphere}}. The interaction with {{w|Titan (moon)#Lakes|surface liquids}} and atmospheres, especially in planets defined {{w|Gas giant|primarily by their gas layers}}, would depend much upon how impermeable and/or rigid the chosen layering method made the additional material. One could imagine a spherical shell of moon matter around Jupiter with such high structural strength as to resist crumbling into its gaseous maw. Alternatively, the moon material could be expected to sink towards the gaseous planet's centre until it reaches a layer sufficiently dense and/or rigid to stop it sinking further. In this case the moon material would displace a volume of the planet's gas causing an increase in the planet's radius.<br /> <br /> ==Transcript==<br /> {{incomplete transcript|Do NOT delete this tag too soon.}}<br /> :[Text above diagram:]<br /> :Moon armor index:<br /> :How thick the shells around various worlds would be if their moon(s) were converted into protective armor<br /> :≈Total moon volume/Planet surface area<br /> <br /> :[Above the diagram, there is a depiction of two moons orbiting a planet, an arrow pointing right, and the same planet with an additional layer around it without orbiting moons.]<br /> <br /> :[The diagram consists of vertical bars showing &quot;moon armor&quot; thicknesses for the Earth, Mars, Jupiter, Saturn, Uranus, Neptune, Pluto, Salacia, Haumea, Quaoar, Gonggong and Eris. Earth's bar has a label named &quot;43 km thick&quot; and is compared to the height of a comparatively small Mt Everest, with randomly drawn features indicating a cross section of the additional layer's rocky material. Most of the other armor thickness bars are not very tall compared to Earth. Some bars, notably Jupiter's, are embellished with various strata-like lines that possibly correspond to different contributing moons. Most bars show some small dots and patterns. A circular viewport shows the zoomed in detail of the top of Mars's otherwise not visible bar that reveals a thin layer with the label of 2&quot;, and also the bottom of a Mars rover wheel on top of the new surface. Pluto's bar is slightly taller than Earth's and has a label &quot;(Mostly Charon)&quot; inside, with arrows pointing into the bar area, which looks similar to that of Earth's Moon.]<br /> <br /> {{comic discussion}}<br /> <br /> [[Category:Astronomy]]<br /> [[Category:Bar charts]]<br /> [[Category:Mars rovers]]</div>

172.68.144.147 https://www.explainxkcd.com/wiki/index.php?title=Talk:2888:_US_Survey_Foot&diff=333932 2024-01-31T21:06:06Z

<p>172.68.144.147: </p> <hr /> <div>&lt;!--Please sign your posts with ~~~~ and don't delete this text. New comments should be added at the bottom.--&gt;<br /> <br /> Breaking news- the comic just got changed to 8,000.016[[User:TenGolf MathHacker|TenGolf MathHacker]] ([[User talk:TenGolf MathHacker|talk]]) 17:28, 31 January 2024 (UTC)<br /> <br /> == UK &amp; Ireland Survey Foot ==<br /> <br /> Until the British Ordnance Survey adopted the metre<br /> they used a foot of 0.304 800 749 1 metres.<br /> <br /> ---------------------------------------------------------------------------<br /> <br /> There are (or used to be) states that specify U.S. survey measure for various things. Others that specify the international definition. Still others that just leave it undefined. Seems normal.<br /> <br /> Although it IS a small difference, the survey grid in the U.S. and thus the property lines for a large portion of the U.S. are done with the older definition and a few reference longi- and latitudes. That could make property lines suddenly shift, so the U.S. survey foot may never fully die. I even made sure it's in my app accurately.<br /> <br /> [[Special:Contributions/162.158.159.236|162.158.159.236]] 19:39, 31 January 2024 (UTC)<br /> <br /> Someone should mention who NIST is (National Institute of Standards and Technology). I'm only familiar with them because of their work with information systems.<br /> <br /> I love XKCD, but it isn't often they make me laugh out loud. The sheer absurdity of this, and that Randall picked up on it did. [[Special:Contributions/172.68.144.147|172.68.144.147]] 21:05, 31 January 2024 (UTC)</div>

172.68.144.147 https://www.explainxkcd.com/wiki/index.php?title=Talk:2888:_US_Survey_Foot&diff=333931 2024-01-31T21:05:27Z

<p>172.68.144.147: </p> <hr /> <div>&lt;!--Please sign your posts with ~~~~ and don't delete this text. New comments should be added at the bottom.--&gt;<br /> <br /> Breaking news- the comic just got changed to 8,000.016[[User:TenGolf MathHacker|TenGolf MathHacker]] ([[User talk:TenGolf MathHacker|talk]]) 17:28, 31 January 2024 (UTC)<br /> <br /> == UK &amp; Ireland Survey Foot ==<br /> <br /> Until the British Ordnance Survey adopted the metre<br /> they used a foot of 0.304 800 749 1 metres.<br /> <br /> ---------------------------------------------------------------------------<br /> <br /> There are (or used to be) states that specify U.S. survey measure for various things. Others that specify the international definition. Still others that just leave it undefined. Seems normal.<br /> <br /> Although it IS a small difference, the survey grid in the U.S. and thus the property lines for a large portion of the U.S. are done with the older definition and a few reference longi- and latitudes. That could make property lines suddenly shift, so the U.S. survey foot may never fully die. I even made sure it's in my app accurately.<br /> <br /> [[Special:Contributions/162.158.159.236|162.158.159.236]] 19:39, 31 January 2024 (UTC)<br /> <br /> Someone should mention who NIST is (National Institute of Standards and Technology). I'm only familiar with them because of their work with information systems.<br /> <br /> I love XKCD, but it isn't often theyake me laugh out loud. The sheer absurdity of this, and that Randall picked up on it did. [[Special:Contributions/172.68.144.147|172.68.144.147]] 21:05, 31 January 2024 (UTC)</div>

172.68.144.147