Difference between revisions of "265: Choices: Part 2"
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{{comic | {{comic | ||
| number = 265 | | number = 265 | ||
| − | | date = May | + | | date = May 22, 2007 |
| title = Choices: Part 2 | | title = Choices: Part 2 | ||
| image = choices_part_2.jpg | | image = choices_part_2.jpg | ||
| Line 8: | Line 8: | ||
==Explanation== | ==Explanation== | ||
| − | This is a little sidetrack from the "Choices" narrative. [[Cueball]] is | + | The "Choices" series was released on 5 consecutive days (Monday-Friday). It explores and marvels at human freedom. This is, however, a little sidetrack from the "Choices" narrative. [[Cueball]] is studying {{w|special relativity}}. The {{w|speed of light}} in a vacuum (299,792,458 m/s) is denoted as ''c''. [[Megan]] and the spaceship are shown traveling at 0.2''c'' in opposite directions. This would mean (in Newtonian mechanics) 0.4''c'' relative to each other. But due to relativistic effects, their velocities do not simply add when the spaceship observes Megan; in reality, both would measure only 0.385''c'' ( = (u + v)/(1 + uv/c<sup>2</sup>) ) from the other's point of view. Also, {{w|time dilation}} influences the way time is observed with reference to the two frames of reference. Megan, however, has other concerns. (This text and part of the image were completely reused in the [[1350#Space|space part]] of the interactive [[1350: Lorenz]] (see image [http://www.explainxkcd.com/wiki/index.php/File:lorenz_-_rocket_16.png here]). |
| − | + | In the title text, Megan thinks about writing about this after-worldly place in Wikipedia, but then realizes that the content would be removed, due to the {{w|Wikipedia:No original research|Wikipedia policy on original research}}, meaning that you are discouraged from writing your own thoughts, the preference being that you have a source you're paraphrasing. Even though her claims would be true, she would need reliable written sources to support them. | |
| − | |||
| − | |||
| − | |||
| − | |||
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| − | + | The series was released on 5 consecutive days (Monday-Friday). All parts of "[[:Category:Choices|Choices]]": | |
| − | + | *[[264: Choices: Part 1]] | |
| + | *[[265: Choices: Part 2]] | ||
| + | *[[266: Choices: Part 3]] | ||
| + | *[[267: Choices: Part 4]] | ||
| + | *[[268: Choices: Part 5]] | ||
| + | |||
| + | As this was the second in the series, it was released on a Tuesday. | ||
==Transcript== | ==Transcript== | ||
| − | :[Cueball is doing some | + | :[Cueball is doing some exercises in a book. The clock on the wall says 12:50.] |
| − | |||
:Chapter 15: Special Relativity | :Chapter 15: Special Relativity | ||
:Problem 1: | :Problem 1: | ||
| − | :Two spacecraft transmit messages to each other while passing at constant velocities of... | + | :Two spacecraft transmit messages to each other while passing at constant velocities of... |
| − | :Cueball: | + | :Cueball: ''sigh'' |
| − | + | ||
| + | :Meanwhile: | ||
:[Megan in a bubble and a spacecraft are moving towards each other. Each one has a velocity vector drawn before themselves, each showing a velocity of 0.2c.] | :[Megan in a bubble and a spacecraft are moving towards each other. Each one has a velocity vector drawn before themselves, each showing a velocity of 0.2c.] | ||
| + | |||
:[They pass each other.] | :[They pass each other.] | ||
:Spacecraft: We observe your speed to be 38.5%c, and your time is passing at 92.3% the rate of ours. Does this mirror your observations? | :Spacecraft: We observe your speed to be 38.5%c, and your time is passing at 92.3% the rate of ours. Does this mirror your observations? | ||
:Megan: Please help me. I think I'm lost. | :Megan: Please help me. I think I'm lost. | ||
| + | |||
:[They continue with the same velocity vectors. Megan is looking back at the spacecraft.] | :[They continue with the same velocity vectors. Megan is looking back at the spacecraft.] | ||
| − | {{comic discussion}} | + | {{comic discussion}} |
| − | + | [[Category:Comics with color]] | |
| + | [[Category:Choices]] | ||
| + | [[Category:Comics sharing name|Choices]] | ||
[[Category:Comics featuring Cueball]] | [[Category:Comics featuring Cueball]] | ||
[[Category:Comics featuring Megan]] | [[Category:Comics featuring Megan]] | ||
| − | |||
| − | |||
[[Category:Physics]] | [[Category:Physics]] | ||
| + | [[Category:Space]] | ||
| + | [[Category:Wikipedia]] | ||
Revision as of 20:01, 26 May 2022
| Choices: Part 2 |
 Title text: Maybe someday I'll get to write the Wikipedia article about this place! Wait, damn, original research. |
Explanation
The "Choices" series was released on 5 consecutive days (Monday-Friday). It explores and marvels at human freedom. This is, however, a little sidetrack from the "Choices" narrative. Cueball is studying special relativity. The speed of light in a vacuum (299,792,458 m/s) is denoted as c. Megan and the spaceship are shown traveling at 0.2c in opposite directions. This would mean (in Newtonian mechanics) 0.4c relative to each other. But due to relativistic effects, their velocities do not simply add when the spaceship observes Megan; in reality, both would measure only 0.385c ( = (u + v)/(1 + uv/c2) ) from the other's point of view. Also, time dilation influences the way time is observed with reference to the two frames of reference. Megan, however, has other concerns. (This text and part of the image were completely reused in the space part of the interactive 1350: Lorenz (see image here).
In the title text, Megan thinks about writing about this after-worldly place in Wikipedia, but then realizes that the content would be removed, due to the Wikipedia policy on original research, meaning that you are discouraged from writing your own thoughts, the preference being that you have a source you're paraphrasing. Even though her claims would be true, she would need reliable written sources to support them.
The series was released on 5 consecutive days (Monday-Friday). All parts of "Choices":
- 264: Choices: Part 1
- 265: Choices: Part 2
- 266: Choices: Part 3
- 267: Choices: Part 4
- 268: Choices: Part 5
As this was the second in the series, it was released on a Tuesday.
Transcript
- [Cueball is doing some exercises in a book. The clock on the wall says 12:50.]
- Chapter 15: Special Relativity
- Problem 1:
- Two spacecraft transmit messages to each other while passing at constant velocities of...
- Cueball: sigh
- Meanwhile:
- [Megan in a bubble and a spacecraft are moving towards each other. Each one has a velocity vector drawn before themselves, each showing a velocity of 0.2c.]
- [They pass each other.]
- Spacecraft: We observe your speed to be 38.5%c, and your time is passing at 92.3% the rate of ours. Does this mirror your observations?
- Megan: Please help me. I think I'm lost.
- [They continue with the same velocity vectors. Megan is looking back at the spacecraft.]
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refresh comments!Discussion
Created the "Choices: Part 3" page (its a bit of a fail), Please link it to here. 121.54.48.38 02:11, 14 May 2013 (UTC)
