explain xkcd - User contributions [en]

Talk:1395: Power Cord

2024-09-05T21:35:36Z

172.68.71.90:

Is there any reason why you would have to avert your eyes... i would think that it may create a dust cloud from the keyboard... but it is a fictional situations, so there may be other reasons...[[Special:Contributions/108.162.249.218|108.162.249.218]] 06:02, 16 July 2014 (UTC)

Has anyone noticed Beret's uncanny ability with power cords? [[User:Thendenster|Thendenster]] ([[User talk:Thendenster|talk]]) 06:29, 16 July 2014 (UTC)

What a stupid unrealistic comic. Things that are blown up with air don't float! >:-C --[[Special:Contributions/108.162.254.97|108.162.254.97]] 07:26, 16 July 2014 (UTC)
:: They do if you start off underwater, or start off in your living room, and then dunk the balloon in crazy glue (to give the balloon shell some rigidity), and then take the inflated balloon underwater, or into a caisson, or a hyperbaric chamber - both 'easily' found at underwater worksites.
:: Or if you're blowing a balloon using a straw that has a one way valve, which goes from your mouth, through your space-suit, and to a balloon which is outside your spacesuit, when you're on the Venusian surface.
:: They can do so, even on Earth, if the air coming out of your mouth is filtered such that the only bits let through are the components of air that are lighter than the natural mixture of air. (For example, a power line that's been highly charged, could ionise Oxygen atoms much more preferentially than ionising Nitrogen atoms as the flow past the sharp edges of the prongs. The ionised oxygen would react with surrounding bits, and be fixed into a solid state... leaving only the Nitrogen to continue flowing). Nitrogen is lighter than Air. Do this for long enough (a big enough balloon) and it will start floating. If you want to do it faster, and with a smaller balloon - pass the exhaled air over some chemical that absorbs and reacts with carbon-di-oxide (Alkali[ne] hydroxides), absorbs and reacts with water vapour (dessicant), absorbs and reacts with oxygen (bacteria), and absorbs and reacts with nitrogen (nitrogen fixing bacteria). [[Special:Contributions/108.162.208.169|108.162.208.169]] 17:39, 20 July 2014 (UTC)
:That's the point of Beret Guy. He's the reality-bender. The SCP-001 among these SCP-999s (or 682, in Black Hat's case).

You obviously don't know how gross a keyboard can be...
Also, if you think this is unrealistic, you obviously haven't read enough XKCD. [[Special:Contributions/108.162.249.220|108.162.249.220]] 07:41, 16 July 2014 (UTC)
:Yes and as can be seen someone has already added a link to the previous comic on gross keyboards so... [[User:Kynde|Kynde]] ([[User talk:Kynde|talk]]) 07:45, 16 July 2014 (UTC) And who says that it is not blown up with helium or the like. First of all we would never see if a stick character was inflated - so Beret guy could be big and filled with helium. Or it is just his crazy ability that makes his blow into the socket turn the "air" into helium in the PC - or something much lighter since the shown inflation would never be enough to carry a laptop. In the end the whole comic is just an excuse to make three crazy puns (like them or not, that is up to the reader) and refeer back to [[237]] [[User:Kynde|Kynde]] ([[User talk:Kynde|talk]]) 07:45, 16 July 2014 (UTC)

:I think 108.162.254.97 is being sarcastic. Pointing out the fact that things filled with air don't float instead of the obvious impossibility of blowing air through an electric wire. [[Special:Contributions/108.162.216.88|108.162.216.88]] 14:46, 16 July 2014 (UTC)BK

:An object filled with air wont go up, but may still bounce out of hand and foat. In this case the sudden increase in volume have ejected the inflated laptop. Since an object almost-as-light-as-air is really sensitive to move of air, the laptop could (in the unlikely case of it happening) behave that way.[[Special:Contributions/141.101.70.103|141.101.70.103]] 09:11, 18 July 2014 (UTC)

Given that Beret Guy often does crazy correctitive things when he perceives something is amiss in his (surreal) visions of the world, I'm wondering if that's a specific protest against having the power chord plugged into the laptop but not the wall (during normal operation, I presume, rather than deliberately depleting the battery of testing the reduced-power settings, or temporarily while other powered devices require the power sockets with more urgency). I don't know whether I personally find this set-up more or less disturbing than a power-chord plugged into the wall but ''not'' plugged into the intended laptop. Although (apart from the risk of leaving residue across the pins), the comic's version is at least safer than the opening text of the explanation would suggest. [[Special:Contributions/141.101.99.192|141.101.99.192]] 12:11, 16 July 2014 (UTC)

...inflation in an xkcd comic? Cue the inflatophobes... [[User:Greyson|Greyson]] ([[User talk:Greyson|talk]]) 13:34, 16 July 2014 (UTC)

Beret Guy is obviously exhaling a lighter-than-air gas, either by just taking a large breath of helium beforehand or by a very special cellular breathing process. Moreover, it should be noted that one averts one's eyes before something holy. [[Special:Contributions/108.162.220.41|108.162.220.41]] 11:02, 16 July 2014 (UTC)
:You also avert your eyes when you know something is going to be propelled at your head from a compressed air keyboard... -Pennpenn [[Special:Contributions/162.158.2.221|162.158.2.221]] 02:49, 11 June 2015 (UTC)

Transcript accuracy: is Cueball actually looking up in panel 2? He's still typing after all. (Also, [[https://www.youtube.com/watch?v=H0f0QzMNk-E&t=17 power chords?]]) --[[Special:Contributions/108.162.221.87|108.162.221.87]] 00:48, 17 July 2014 (UTC)

why are all the ips from cloudfare servers? sockpuppets?[[Special:Contributions/173.245.53.121|173.245.53.121]] 09:08, 18 July 2014 (UTC)
: explainxkcd is hosted through Cloudflare's cdn and all of us connect through Cloudflare. --[[Special:Contributions/172.68.141.146|172.68.141.146]] 17:05, 9 July 2020 (UTC)
My mother once blown a lighter than air balloon, our best guess was that it was hot air from some fever or something. [[Special:Contributions/108.162.210.233|108.162.210.233]] 19:56, 18 July 2014 (UTC)
:That would only work for as long as the air in the balloon is warmer than the air surrounding it. I doubt that the balloon is that good as an isulator to have this occur for long. --[[User:Lupo|Lupo]] ([[User talk:Lupo|talk]]) 11:13, 16 January 2020 (UTC)

We can see his screen a bit in panel 3. Can anyone tell what he's doing? [[Special:Contributions/172.69.62.203|172.69.62.203]] 22:07, 2 September 2021 (UTC)
:Reading xkcd, it looks like. Good catch. [[User:Nitpicking|Nitpicking]] ([[User talk:Nitpicking|talk]]) 16:25, 6 December 2021 (UTC)
::Looks more like a newsletter(/paper), to me. A traditional printed-style (but PDFed, scanned or HTML+CSSed, obviously) two-column split of various paragraphs and images (no obvious headlines). The obvious image looks less than stick-figure... could be a boxer in action, but the residual resolution (and the method of interpolation needed to 'read between the dots') leaves that a very open issue and maybe flavoured by the eye of this particular beholder, unable to unsee what the vague first imrpession was. But it looks like it was doodled as more than a stick-figure (within the limitations of the pixelation), and doesn't have that basic Comic-like look of XKCD (or even a What-If). Though maybe one of the more Infographic ones, extending well off page? [[Special:Contributions/172.70.162.147|172.70.162.147]] 21:20, 6 December 2021 (UTC)
::: i did a manual quality upscale. its at https://drive.google.com/file/d/1vznnh7ZkSJXei9brI4sNE9cVM8-QmXOc/view?usp=sharing [[User:Plushiefan4111|plushie fan]] ([[User talk:Plushiefan4111|talk]]) 00:26, 20 November 2023 (UTC)

Talk:2974: Storage Tanks

2024-08-21T14:47:20Z

172.68.71.90:

The symmetry of the truss intrigues me. Struts that are diagonal across the faces of the cuboids is normal, but is it a real thing to also use the body diagonal? Never seen that IRL, not sure if it makes sense from the statics. --[[Special:Contributions/172.70.247.82|172.70.247.82]] 22:16, 19 August 2024 (UTC)
: Struts as shown provide some left-right stability, but not as effectively as struts across the face would. They also provide some redundant front-back stability with the struts running along the faces. [[Special:Contributions/172.68.71.90|172.68.71.90]] 14:47, 21 August 2024 (UTC)

Seems like a pretty menial job for the "head of security". I think he would delegate this to a security guard. [[User:Barmar|Barmar]] ([[User talk:Barmar|talk]]) 00:47, 20 August 2024 (UTC)
: They may be head of a department of one.[[Special:Contributions/172.70.85.139|172.70.85.139]] 08:50, 20 August 2024 (UTC)
:: That's part of the joke, that the #1 concern of the Head of Security is calculus teachers wielding power drills for class demonstrations. [[User:Laser813|Laser813]] ([[User talk:Laser813|talk]]) 17:33, 20 August 2024 (UTC)

The explanation mentions there might be more complex calculus examples where the shape might not be a cylinder. I think some further explanation could be added that this does not change the pressure (hydrostatic paradox) but indeed change the rate of emptying the object. If differing cross sections are relevant at all. [[Special:Contributions/108.162.221.103|108.162.221.103]] 05:40, 20 August 2024 (UTC)
: Non-prismatic geometries are I think the ones being alluded to here, i.e a frustrum with the pointy end down will have a greater reduction in pressure for a given volume of flow towards the end than at the start, which may offset the reduction in absolute pressure. I've also seen examples where the flow rate is considered constant and the problem is to work out the fluid depth as a function of time, e.g. filling a pyramidal pool from a hose. [[Special:Contributions/172.70.58.4|172.70.58.4]] 16:44, 20 August 2024 (UTC)

Its the most difficult job in history, even the best workers couldn't stand 1 day as head of security.[[User:I HAVE NO NAME|I HAVE NO NAME]] ([[User talk:I HAVE NO NAME|talk]]) 05:55, 20 August 2024 (UTC)

I have to admit, I thought I knew calc as I had two semesters of it, but I had to look up what he meant by this. Ouch [[Special:Contributions/172.70.242.55|172.70.242.55]] 13:01, 20 August 2024 (UTC)student

If anyone could suggest something I can do for my class now that I can no longer drill holes in tanks, I'd appreciate the advice, thanks. [[User:Fephisto|Fephisto]] ([[User talk:Fephisto|talk]]) 16:18, 20 August 2024 (UTC)

Someone should do the math on the calculus problem as presented, as well as the algebra version. [[User:Laser813|Laser813]] ([[User talk:Laser813|talk]]) 17:33, 20 August 2024 (UTC)
: Randall, like all good mathematics textbook authors, left the problem as an exercise for the reader. Does this happen often enough to warrant a tag? [[User:Paddles|Paddles]] ([[User talk:Paddles|talk]]) 05:57, 21 August 2024 (UTC)
:: Yes... [[User:Transgalactic|Transgalactic]] ([[User talk:Transgalactic|talk]]) 10:10, 21 August 2024 (UTC)

Is there anyone else who thought the calculus teacher was abusing the tank as a model for the complex plane, demonstrating how to [https://en.wikipedia.org/wiki/Removable_singularity remove a singularity] from a holomorphic function? I wasn't confronted with that particular tank-emptying problem in high school, so my first encounter with "holes" in maths was in complex analysis. The title text was a mystery. [[User:Transgalactic|Transgalactic]] ([[User talk:Transgalactic|talk]]) 10:10, 21 August 2024 (UTC)

As a mathematician, I'm surprised I didn't know about this idea. (It's definitely not my field!) I actually thought the flow would be constant, an algebraic problem. Oh, I'm sure I saw these types of problems in Calculus (and I remember problems like this in Differential Equations), but I thought those were just to make the math more complicated, not based in reality... So is it the weight of the liquid remaining above the hole that is the source of the pressure (i.e., would it be the same if the top of the tank were open), or is it the air pressure in the tank as the volume of liquid decreases and volume of air increases? [[User:Mathmannix|Mathmannix]] ([[User talk:Mathmannix|talk]]) 11:08, 21 August 2024 (UTC)
:A sealed-top would change the dynamics (like trying to pour the contents of a 2 litre (or whatever the US equivalent is) pop/soda bottle, it will tend to 'glug glug glug' intermittently unless you: a) incline the bottle to allow an optimum amount lf free akr back into the emltying bottle or, b) initialise the up-ended emptying with a spin sufficient to create a 'waterspout' effect up through which the replacement air can (more) freely pass.
:Though there are other possible factors, in that example, including the potential pressure of any self-releasing carbonation pressure (e.g. giving the bottle a shake, or a foreign body, before releasing the 'pour') and/or squeezing/'milking' the soft plastic container strategically to create another form of pressurised expulsion.
:For the 'classical' problem, one should probably assume sufficient inward venting (either an open/part-open top or a second hole drilled near the top to effect this purpose) as well as a reasonably unexotic liquid (neither molasses, cornstarch-mixture, anything that is actually a very fine dry powder, anything that reacts significantly with/upon air, any liquid very close to its vapour-point nor ''specifically'' supercooled helium) or any additional elements (stirrers, baffles, spongey inners, inner membranes or the contents being a layered combination of imiscable liquids of different densities that may or may not react slightly all across the interface plane). Most things that aren't actually exotic (and even a few that are, and might warrant a warning /¡\) are close enough to water to treat as if just that, at least under the further assumption that we're working at or around Standard Temperature and Pressure. But a slightly different density, viscosity and surface tension (plus the nature of the container, e.g. extreme hydrophilic or hydrophobic inner coatings where water is involved) ''could'' (in combination) drastically change the actual outcome given enough of the right kind of simultaneous differences imparted. [[Special:Contributions/172.70.86.37|172.70.86.37]] 14:28, 21 August 2024 (UTC)