162: Angular Momentum - Revision history

FaviFake: not sure it's trivial

2025-10-23T20:39:13Z

not sure it's trivial

JohnHawkinson: /* Trivia */ oops, link typo; give time range for voiceover instead

2025-10-21T17:09:52Z

‎Trivia: oops, link typo; give time range for voiceover instead

JohnHawkinson: /* Trivia */ What-if video sunset frame

2025-10-21T17:06:27Z

‎Trivia: What-if video sunset frame

CategoryGeneral: Undo the edit

2024-11-10T01:53:27Z

Undo the edit

172.70.55.117 at 21:33, 9 November 2024

2024-11-09T21:33:57Z

FaviFake: this was worded in a weirdly complex way

2024-10-22T15:23:58Z

this was worded in a weirdly complex way

172.70.175.195: xkcd volume 0 calculation

2024-01-01T14:18:49Z

xkcd volume 0 calculation

FaviFake: /* Trivia */ Updated xkcd store link with Web archive link

2023-09-01T09:41:40Z

‎Trivia: Updated xkcd store link with Web archive link

172.70.90.134: /* Explanation */ May still need to be said

2023-07-27T15:07:35Z

‎Explanation: May still need to be said

FaviFake: This comic explanation was a mess of 10 small paragraphs, technical terms, random words in bold (???) and was just incredibly disorganized and messy. I fixed it! :D

2023-07-27T10:36:02Z

This comic explanation was a mess of 10 small paragraphs, technical terms, random words in bold (???) and was just incredibly disorganized and messy. I fixed it! :D

@@ Line 8: / Line 8: @@
 ==Explanation==
 Every moving object, including the Earth, possesses {{w|momentum}}. The Earth has a very high momentum due to its large mass and high speed as it orbits the Sun. However, the comic refers specifically to the Earth's angular momentum generated by its rotation on its axis, which creates the day/night cycle. This momentum can change (increase, decrease, or halt) through the application of force from another object, which acts as the transfer of momentum from one object to another.
@@ Line 13: / Line 14: @@
 The title text also jokes that the amount of time Megan is gaining from spinning might also not be worth her risk of vomiting due to the dizziness.
 ==Transcript==
@@ Line 27: / Line 30: @@
 * This is one of the six [[Footer comics|footer comics]] featured in the bottom segment of [https://xkcd.com xkcd.com].
 * This comic used to be [https://web.archive.org/web/20220125023401/https://store.xkcd.com/products/signed-prints available as a signed print] in the xkcd store before it was [[Store|shut down]].

@@ Line 27: / Line 27: @@
 * This is one of the six [[Footer comics|footer comics]] featured in the bottom segment of [https://xkcd.com xkcd.com].
 * This comic used to be [https://web.archive.org/web/20220125023401/https://store.xkcd.com/products/signed-prints available as a signed print] in the xkcd store before it was [[Store|shut down]].
-* The [[What_If%3F_chapters#Longest_Sunset|32nd What If video]] features a sunset-colored reillustration of this comic at at [https://youtu.be/U8F7UNK9jco?st=153 2:33]: [[Image:U8F7UNK9jco-95-2m33sec.jpg|thumb|480px]]
+* The [[What_If%3F_chapters#Longest_Sunset|32nd What If video]] features a sunset-colored reillustration of this comic at at [https://youtu.be/U8F7UNK9jco?t=139 2:19–2:33]: [[Image:U8F7UNK9jco-95-2m33sec.jpg|thumb|480px]]

@@ Line 27: / Line 27: @@
 * This is one of the six [[Footer comics|footer comics]] featured in the bottom segment of [https://xkcd.com xkcd.com].
 * This comic used to be [https://web.archive.org/web/20220125023401/https://store.xkcd.com/products/signed-prints available as a signed print] in the xkcd store before it was [[Store|shut down]].
 {{comic discussion}}

@@ Line 10: / Line 10: @@
 Every moving object, including the Earth, possesses {{w|momentum}}. The Earth has a very high momentum due to its large mass and high speed as it orbits the Sun. However, the comic refers specifically to the Earth's angular momentum generated by its rotation on its axis, which creates the day/night cycle. This momentum can change (increase, decrease, or halt) through the application of force from another object, which acts as the transfer of momentum from one object to another.
-[[Megan]] is attempting to slow down the Earth's angular momentum by spinning counterclockwise (a.k.a. {{wiktionary|anticlockwise}}) and force her momentum onto the Earth, so she can have more time to spend teaching [[Cueball]] how to use a weldom. The momentum she produces is minuscule relative to the Earth's. The attosecond she's gaining by spinning while being with Cueball is nothing compared with the seconds spent spinning. A Reddit user [https://www.reddit.com/r/theydidthemath/comments/5ccbzs/comment/d9vskah calculated] the time Megan is gaining by spinning is less than the time it takes for light to travel across 5% of the diameter of an atom. Megan could gain a considerably larger (but still minuscule) amount of time [https://www.reddit.com/r/theydidthemath/comments/4mdihu/request_if_every_single_person_in_the_world_did/d3uvmk3/ by walking to the equator]. Later, in [[442: xkcd Loves the Discovery Channel]], the same kind of spinning Megan is used in the first frame to tell that xkcd loves momentum.  {{w|Wired (magazine)|Wired}} [https://www.wired.com/2014/04/can-you-slow-down-a-day-using-angular-momentum/ calculated] how much time Megan slowed down. And finally, in ''[[xkcd: volume 0]]'', this is also calculated above the comic, giving a final value of 10<sup>-35</sup>s per turn, or 1/10000 of a quectosecond. This comic is referenced at the end of the ''[[what if? (blog)|what if?]]'' article ''{{what if|42|Longest Sunset}}''.
+[[Megan]] is attempting to slow down the Earth's angular momentum by spinning counterclockwise (a.k.a. {{wiktionary|anticlockwise}}) and force her momentum onto the Earth, so she can have more time to spend with [[Cueball]]. The momentum she produces is minuscule relative to the Earth's. The attosecond she's gaining by spinning while being with Cueball is nothing compared with the seconds spent spinning. A Reddit user [https://www.reddit.com/r/theydidthemath/comments/5ccbzs/comment/d9vskah calculated] the time Megan is gaining by spinning is less than the time it takes for light to travel across 5% of the diameter of an atom. Megan could gain a considerably larger (but still minuscule) amount of time [https://www.reddit.com/r/theydidthemath/comments/4mdihu/request_if_every_single_person_in_the_world_did/d3uvmk3/ by walking to the equator]. Later, in [[442: xkcd Loves the Discovery Channel]], the same kind of spinning Megan is used in the first frame to tell that xkcd loves momentum.  {{w|Wired (magazine)|Wired}} [https://www.wired.com/2014/04/can-you-slow-down-a-day-using-angular-momentum/ calculated] how much time Megan slowed down. And finally, in ''[[xkcd: volume 0]]'', this is also calculated above the comic, giving a final value of 10<sup>-35</sup>s per turn, or 1/10000 of a quectosecond. This comic is referenced at the end of the ''[[what if? (blog)|what if?]]'' article ''{{what if|42|Longest Sunset}}''.
 The title text also jokes that the amount of time Megan is gaining from spinning might also not be worth her risk of vomiting due to the dizziness.

@@ Line 10: / Line 10: @@
 Every moving object, including the Earth, possesses {{w|momentum}}. The Earth has a very high momentum due to its large mass and high speed as it orbits the Sun. However, the comic refers specifically to the Earth's angular momentum generated by its rotation on its axis, which creates the day/night cycle. This momentum can change (increase, decrease, or halt) through the application of force from another object, which acts as the transfer of momentum from one object to another.
-[[Megan]] is attempting to slow down the Earth's angular momentum by spinning counterclockwise (a.k.a. {{wiktionary|anticlockwise}}) and force her momentum onto the Earth, so she can have more time to spend with [[Cueball]]. The momentum she produces is minuscule relative to the Earth's. The attosecond she's gaining by spinning while being with Cueball is nothing compared with the seconds spent spinning. A Reddit user [https://www.reddit.com/r/theydidthemath/comments/5ccbzs/comment/d9vskah calculated] the time Megan is gaining by spinning is less than the time it takes for light to travel across 5% of the diameter of an atom. Megan could gain a considerably larger (but still minuscule) amount of time [https://www.reddit.com/r/theydidthemath/comments/4mdihu/request_if_every_single_person_in_the_world_did/d3uvmk3/ by walking to the equator]. Later, in [[442: xkcd Loves the Discovery Channel]], the same kind of spinning Megan is used in the first frame to tell that xkcd loves momentum.  {{w|Wired (magazine)|Wired}} [https://www.wired.com/2014/04/can-you-slow-down-a-day-using-angular-momentum/ calculated] how much time Megan slowed down. And finally, in ''[[xkcd: volume 0]]'', this is also calculated above the comic, giving a final value of 10<sup>-35</sup>s per turn, or 1/10000 of a quectosecond. This comic is referenced at the end of the ''[[what if? (blog)|what if?]]'' article ''{{what if|42|Longest Sunset}}''.
+[[Megan]] is attempting to slow down the Earth's angular momentum by spinning counterclockwise (a.k.a. {{wiktionary|anticlockwise}}) and force her momentum onto the Earth, so she can have more time to spend teaching [[Cueball]] how to use a weldom. The momentum she produces is minuscule relative to the Earth's. The attosecond she's gaining by spinning while being with Cueball is nothing compared with the seconds spent spinning. A Reddit user [https://www.reddit.com/r/theydidthemath/comments/5ccbzs/comment/d9vskah calculated] the time Megan is gaining by spinning is less than the time it takes for light to travel across 5% of the diameter of an atom. Megan could gain a considerably larger (but still minuscule) amount of time [https://www.reddit.com/r/theydidthemath/comments/4mdihu/request_if_every_single_person_in_the_world_did/d3uvmk3/ by walking to the equator]. Later, in [[442: xkcd Loves the Discovery Channel]], the same kind of spinning Megan is used in the first frame to tell that xkcd loves momentum.  {{w|Wired (magazine)|Wired}} [https://www.wired.com/2014/04/can-you-slow-down-a-day-using-angular-momentum/ calculated] how much time Megan slowed down. And finally, in ''[[xkcd: volume 0]]'', this is also calculated above the comic, giving a final value of 10<sup>-35</sup>s per turn, or 1/10000 of a quectosecond. This comic is referenced at the end of the ''[[what if? (blog)|what if?]]'' article ''{{what if|42|Longest Sunset}}''.
 The title text also jokes that the amount of time Megan is gaining from spinning might also not be worth her risk of vomiting due to the dizziness.

@@ Line 8: / Line 8: @@
 ==Explanation==
-A '''moving object''' (like the Earth) has momentum. '''[https://www.quora.com/If-light-does-not-have-mass-then-how-does-it-have-momentum-1 Momentum]''' is the '''mass''' (size) of the object multiplied by the '''velocity''' (speed) of the moving object. So, the Earth has a '''very high momentum''' because the Earth has a '''large mass''' (size) and is moving at a '''high velocity''' (speed) around the Sun. However, the momentum referenced in this comic is the angular momentum of the Earth spinning on its axis, which creates the days and nights. A moving object has to keep moving '''at the same velocity''' for its momentum to stay the same. The momentum of a moving object can increase, decrease, or stop via the force of another object. '''Force''' is the transfer of momentum from one object to another.
+Every moving object, including the Earth, possesses {{w|momentum}}. The Earth has a very high momentum due to its large mass and high speed as it orbits the Sun. However, the comic refers specifically to the Earth's angular momentum generated by its rotation on its axis, which creates the day/night cycle. This momentum can change (increase, decrease, or halt) through the application of force from another object, which acts as the transfer of momentum from one object to another.
-[[Megan]] attempts to slow down the Earth's angular momentum, and spins counterclockwise (more commonly known as {{wiktionary|anticlockwise}}, for non-American English) to force her momentum onto the Earth, so that she can have more time with the one she loves.
+[[Megan]] is attempting to slow down the Earth's angular momentum by spinning counterclockwise and force her momentum onto the Earth, so she can have more time to spend with [[Cueball]]. The momentum she produces is minuscule relative to the Earth's. The attosecond she's gaining by spinning while being with Cueball is nothing compared with the seconds spent spinning. A Reddit user [https://www.reddit.com/r/theydidthemath/comments/5ccbzs/comment/d9vskah calculated] that the time Megan is gaining by spinning is less than 1/20th of the time light takes to cross the diameter of an atom. Megan could gain a considerably larger (but still minuscule) amount of time [https://www.reddit.com/r/theydidthemath/comments/4mdihu/request_if_every_single_person_in_the_world_did/d3uvmk3/ by walking to the equator]. Later, in [[442: xkcd Loves the Discovery Channel]], the same kind of spinning Megan is used in the first frame to tell that xkcd loves momentum.
 The title text also jokes that the amount of time Megan is gaining from spinning might also not be worth her risk of vomiting due to the dizziness.
 ==Transcript==
@@ Line 42: / Line 28: @@
 * This comic is available as a signed print in the [https://store.xkcd.com/products/signed-prints xkcd store].
 * {{w|Wired (magazine)|Wired}} [https://www.wired.com/2014/04/can-you-slow-down-a-day-using-angular-momentum/ calculated] how much time Megan slowed down.
-* This strip is referenced at the end of [https://what-if-origin.sciesnet.net/42/ ''What if?'' chapter 42].
+* This comic is referenced at the end of the ''[[what if? (blog)|what if?]]'' article ''{{what if|42|Longest Sunset}}''.
 {{comic discussion}}