explain xkcd - User contributions [en]

2973: Ferris Wheels

2024-08-19T23:53:52Z

172.70.211.219: /* Explanation */ ce

{{comic
| number = 2973
| date = August 16, 2024
| title = Ferris Wheels
| image = ferris_wheels_2x.png
| imagesize = 624x280px
| noexpand = true
| titletext = They left the belt drive in place but switched which wheel was powered, so people could choose between a regular ride, a long ride, and a REALLY long ride.
}}

==Explanation==
{{incomplete|Created by a BELT POWERED BY A DIFFERENT WIKI PAGE IN ORDER TO KEEP THIS ONE GOING - Please change this comment when editing this page. Do NOT delete this tag too soon.}}

This comic depicts an attempted connection of three {{w|Ferris wheel}}s using a {{w|Belt (mechanical)|mechanical belt drive}}, a system typically used to transfer motion between rotating shafts. By connecting the wheels at different circumferences, the relative motion is geared up or down. If the belt passes around the circumference of one wheel and is connected around the hub of another, the latter will rotate significantly faster. In this case, the second wheel's circumference is in turn connected to a third wheel's hub, resulting in even greater rotational velocity. However, this setup is mechanically unsound and possibly dangerous, as Ferris wheels are not intended to be connected in this way.{{cn}} As shown, the first wheel on the left is running at a normal speed, while the other two are rotating increasingly fast, leading to a potentially hazardous situation where passengers are flung around to various (possibly {{w|G-force#Human tolerance|quite hazardous}}) extents.

Ferris wheels can vary widely in size and speed of rotation, but for illustration, let us assume a diameter of about 200 feet (60 m) and a pretty sedate speed of around 10 minutes per full rotation. The apparent ratio between the connected wheels in the comic is approximately 12.5:1, meaning the motion is significantly sped up as it’s transferred. The second Ferris wheel, driven by the first, could spin at around 1.3 rpm, with passengers moving at 9 mph (14 km/h), giving a more exciting ride, but not inherently dangerous. However, when this motion is further transferred to the third Ferris wheel, it could spin at 16 rpm, with passengers traveling at over 110 mph (180 km/h), subjecting them to 8 Gs of force—conditions that would be hazardous. However, since the motor for the first wheel would have been selected merely to drive one wheel, it's unlikely that to be able to power the other two wheels moving at increased speeds.

In the caption [[Randall]] says that he was fired for this ill-advised modification, highlighting the impracticality and dangers of the idea. A cruise line also fired the cartoonist due to an unsound engineering proposal earlier in [[2935: Ocean Loop]].

The title text imagines the consequences of leaving the belt drive system in place but switching which wheel is powered. If the most extreme wheel (the third one on the right) is powered, the gearing would be reversed, making for a possibly pleasant and normal ride on the right-hand wheel, but rendering the experiences of the riders on the other two wheels far too slow for an enjoyable carnival ride. One revolution of the center wheel might take two hours and five minutes, while the left wheel would take more than a day (twenty-six hours to be exact)  per revolution.    This exaggerates the impracticality and unintended effects of using a belt drive system to link up Ferris wheels, illustrating how such an idea would lead to absurdly varied ride experiences.

Randall has previously explored the limits of the human body's tolerance for acceleration in ''What If # 116 "No Rules NASCAR"'' [https://what-if.xkcd.com/116/].

==Transcript==
:[Three Ferris wheels are shown side by side, with some people stood on the ground for scale. Each of the first two wheels has a belt connecting its circumference to the axle of the wheel to its right. "Agitrons" indicate that the middle wheel is turning notably faster than the left wheel, with the gondolas seen to be rocking significantly at all points round the wheel. The spokes of the right wheel are completely replaced by "motion lines", indicating that the the right wheel is turning the fastest of all. All its gondolas are hanging outwards against centripetal force, interspersed with their own motion lines.]

:[Caption below the panel:]
:The county fair fired me for adding a belt drive to the Ferris wheels.

==Trivia==
The first (slowest) wheel can be seen to notably lack a 'spoke' at approximately the five o'clock position, supporting the point where its respective passenger seating is hung. Clearly, however, the wheel design is strong enough to withstand much greater forces in the other two versions of the wheel (which appears to be complete in the case of the second, though the thin spokes are only seen as blurs in the third wheel) suggesting that there may not be significant danger from this omission. It does not bode well, however, for general {{w|Occupational Safety and Health Administration|OSHA compliance}} in how they erect/maintain the rides, even before the belt-drive idea added its own issues.

{{comic discussion}}

[[Category:Physics]]
[[Category:Engineering]]

2935: Ocean Loop

2024-05-21T04:54:48Z

172.70.211.219: Undo revision 342664 by 162.158.56.147 (talk)

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Talk:2922: Pub Trivia

2024-04-19T21:05:11Z

172.70.211.219:

I expect that the BTS question is a reference to the traditional Korean system of counting a person's age in units of Sal which started at 1 and incremented on the first day of the year. Since this system was abandoned on official documents in 2023, but is still in use in some contexts, the question of whether every member of BTS had a "birthday" on the first day of the year is ambiguous. [[User:Philhower|Philhower]] ([[User talk:Philhower|talk]]) 14:13, 19 April 2024 (UTC)

question 5, planets exist outside the solar system, adding to the ambiguity. [[User:Philhower|Philhower]] ([[User talk:Philhower|talk]]) 14:15, 19 April 2024 (UTC)
:One of the requirements in the definition of a planet is that it orbits the Sun, so no there are no planets outside the Solar system. [[User:Tharkon|Tharkon]] ([[User talk:Tharkon|talk]]) 17:50, 19 April 2024 (UTC)

::{{w|NASA}} disagrees. [https://exoplanetarchive.ipac.caltech.edu/ Exoplanet Archive] shows 5612 confirmed planets. -- [[User:Hkmaly|Hkmaly]] ([[User talk:Hkmaly|talk]]) 20:55, 19 April 2024 (UTC)
::: The IAU is the body that defines such things - and they do say that planets have to orbit the Sun...things that orbit other stars are properly called "exo-planets". But still - do we include dwarf planets? Rogue planets? It's definitely a crazy-vague question. [[Special:Contributions/172.70.211.219|172.70.211.219]] 21:05, 19 April 2024 (UTC)

As for question 9, please see the note about the history of Austrailia's capitals at: [[https://en.wikipedia.org/wiki/List_of_former_national_capitals#Oceania]]. and the page regarding countries with multiple capitals [[https://en.wikipedia.org/wiki/List_of_countries_with_multiple_capitals]] [[User:Philhower|Philhower]] ([[User talk:Philhower|talk]]) 14:24, 19 April 2024 (UTC)

About the alt text, London is certainly in Europe. The question itself is malformed because "Europe (or 'the EU')" is not self-consistent: there is a lot of European countries that are not part of the EU. [[User:RedGolpe|RedGolpe]] ([[User talk:RedGolpe|talk]]) 14:32, 19 April 2024 (UTC)
:The "Greater London" answer is also tricksy, as the "ceremonial county" of GL {{w|London boroughs|may not include}} the additional area of the City Of London (though it does include the City Of Westminster, which is sometimes the trick answer to certain trick questions that a quizmaster might attempt to pull). The ''administrative'' Greater London is the ceremonial one ''plus'' CoL, however... [[Special:Contributions/172.70.162.19|172.70.162.19]] 15:04, 19 April 2024 (UTC)
::I would argue London is not in Europe because there is no clear definition for Europe as a geographic area, it really doesn't have an eastern border that is not arbitrary, so the only clearly defined thing Europe can refer to is the EU. [[User:Tharkon|Tharkon]] ([[User talk:Tharkon|talk]]) 17:50, 19 April 2024 (UTC)
:::London, France is both in Europe and the EU https://en.wikipedia.org/wiki/London,_France [[Special:Contributions/172.70.163.49|172.70.163.49]] 18:00, 19 April 2024 (UTC)

The [https://en.wikipedia.org/wiki/Benxi Benxi Lake] is actually considered to be the smallest lake in the world. [[Special:Contributions/172.70.135.205|172.70.135.205]]
:{{cn}}[[Special:Contributions/172.70.86.176|172.70.86.176]] 14:40, 19 April 2024 (UTC)

I never realized how challenging it is to edit pages when they've just been posted. Makes me long for something like Google docs.[[Special:Contributions/172.68.3.43|172.68.3.43]] 14:39, 19 April 2024 (UTC)

People, who are born on 29th February don't have a birthday in years which are not leap years. However, 2024, when this comic was published is a leap year. --[[Special:Contributions/162.158.95.9|162.158.95.9]] 14:40, 19 April 2024 (UTC)

"5. How many planets were there originally?" This could also refer even back to the start of the universe, when there were (likely) just 0 planets. --[[Special:Contributions/162.158.86.101|162.158.86.101]] 14:43, 19 April 2024 (UTC)

I anticiated a lot of Edit Conflicts, but not actually quite so many as to not to be able to resolve my edits with everyone else's. This is the bare-bones that I was putting in (until finding multiple attempts tried to be added consecutively...
{{cot}}
{| class="wikitable"
|-
! Question !! Problem !! Possible answer(s)
|-
| Which member of BTS has a birthday this year?
| Every living person has a birthday this year (being a leap-year, this includes those born on 29/Feb).
|
|-
| How many sides does a platonic solid have?
| There are five (or [[2781: The Six Platonic Solids|six]]) platonic solids, each with a different number of sides.
| 4, 6, 8, 12 or 20
|-
| What is the smallest lake in the world?
| The distinction between a small lake and a pond, pool or puddle (for example) is difficult to define.
|
|-
| Which Steven Spielberg movie features more shark attacks? Jaws (1875) or Lincoln (2012)
| Not a problem, as Lincoln has very few shark attacks.{{Citation needed}} The problem is that barely anyone will ''not'' be able to correctly answer this.
|
|-
| How many planets were there originally?
| Contextually vague. At what time and within what volume of space, and what is the scope of 'planet' defined here?
|
|-
| What NFL player has scored the most points outside of a game?
| Outside of (NFL) games, individuals may accumulate points in any number of ways (e.g. Scrabble)
|
|-
| The Wright brothers built the first airplane. Who built the last one?
| Until no further planes are built, individuals/teams/companies continue to build (to completion) ever more examples, changing the answer possibly moment to moment.
|
|-
| Is every even number greater than 2 the sum of two primes?
| This is a {{w|Goldbach's conjecture|currently unanswered question}}.
|
|-
| Not counting Canberra, what city is the capital of Australia?
| Canberra is ''the'' capital of Australia, a fairly well known 'obscure' fact. Each Australian territory also has their own state capital, so there is not one other ''single'' example.
|
|-
| Who played the drums?
| Lack of context. With which group? For which song? For which (re-)recording? At which event?
|
|-
| Where is London located? (a) The British Isles (b) Great Britain and Northern Ireland (c) The UK (d) Europe (or 'the EU') (e) Greater London
| Almost all of these are correct (though London is geographically in Europe but no longer in the EU).
|}

This is apparently deliberate (at least on behalf of the organisers), perhaps to upset or otherwise impede groups of overconfident quizzers who would otherwise dominate any genuinely good quiz.
{{cob}}
...make use of it however you wish, anybody who has the time not to keep chasing all the simultaneous edits. (The above is a bit behind 'perfection', and lacks many of the integrations, wikilinks and adjustments I had made. I backspaced out of the edit I had finally reached, before remembering to take a full copy into my paste-buffer!) [[Special:Contributions/172.70.90.115|172.70.90.115]] 14:53, 19 April 2024 (UTC)

I thought the answer to #2 could be 1, because as 3D solids they only have one surface. I would guess the player with the most points outside of a game is the one who's played idlers (like Cookie Clicker) the longest — though I suppose those could be considered "inside of a game" as well. Also, I played the drums. [[Special:Contributions/172.70.254.143|172.70.254.143]] 15:33, 19 April 2024 (UTC)
:The answer to #2 is '2 - the in-side and the out-side'.[[Special:Contributions/172.69.43.242|172.69.43.242]] 15:46, 19 April 2024 (UTC)

Considering the platonic solids explanation lists all the correct answers, could someone include a list of all the members of BTS and their respective birthdays? Bing copilot suggests the following:

1. **Jin (Kim Seok-jin)**:
- Birthday: **December 4, 1992**

2. **Suga (Min Yoon-gi)**:
- Birthday: **March 9, 1993**

3. **J-Hope (Jung Hoseok)**:
- Birthday: **February 18, 1994**

4. **RM (Kim Nam-joon)**:
- Birthday: **September 12, 1994**

5. **Jimin (Park Ji-min)**:
- Birthday: **October 13, 1995**

6. **V (Kim Tae-Hyung)**:
- V's birthday is **December 30**, but the year is not mentioned in the provided information.

7. **Jungkook (Jeon Jungkook)**:
- Jungkook's birthday is **September 1**, but the year is not mentioned in the provided information.
[[Special:Contributions/172.70.162.19|172.70.162.19]] 15:48, 19 April 2024 (UTC)

: I'm not opposed to adding BTS birthdays, but I think it should be done by someone more knowledgeable about the band than me. Birthdays can be a surprisingly nuanced subject.[[User:Comatoran|Comatoran]] ([[User talk:Comatoran|talk]]) 15:59, 19 April 2024 (UTC)
:Wikipedia says {{w|V_(singer)|'95}} and {{w|Jungkook|'97}} respectively[[Special:Contributions/172.70.162.37|172.70.162.37]] 16:04, 19 April 2024 (UTC)

London is both a City (London) and a City within a City (The City of London) and an Area (Greater London)
There are also many more places named London than the one that is the Capital of the UK .. Serbia, France, Canada (Which is larger and the one in the UK), 10 in the USA, and one on Kiribati 17:56, 19 April 2024 (UTC)