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Ancient Domains Of Mystery, forum overview / General / Relativity Question

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Caladriel
Registered user
ReGiStErEd UsEr


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4668 days, 12 hours, 20 minutes and 5 seconds ago.
Posted on Tuesday, May 10, 2011 at 17:02 (GMT -5)

Okay, a thought problem with regards to relativity (Bold Red arrows indicates what direction a point or line is moving. Bold Blue arrows represent the X-Axis and Y-Axis):


              
                    ^ 
                    |
                   
    ^               *A
    |               |
                    |
 <- *  .  .  .  .  .*B
    D               |
                    |
                    |            <- *
                    |               F
                    *C

         * E

                    ^ 
                    |
                    Y-Axis
                 <- X-Axis




1) ABC is moving on the Y-Axis at, say, speed 60 miles/second, relative to E
2) B eventually fires projectile D at 90 degrees from the direction it is moving.
- D's velocity has 2 components: D should move along the X-Axis at, say, speed 70 miles/second , relative to E, but its velocity would also have a Y-Axis component.

Question: Would D continue to move along the Y axis at speed 60 miles/second relative to E (ie. Would the Y component of its velocity, relative to E, be the same as the Y component of ABC's velocity?) or would relativity start messing around with its Y velocity from E's perspective? What about from the perspective of F, which is independently travelling parallel to the X axis at some constant speed, relative to E?


3) Periodically, D fires a small projectile (not included in the picture) back, parallel to the X axis
- I assume this projectile should always strike B (assuming it travels fast enough)
- The projectile's velocity also has 2 components: It should move along the X-Axis at, say, speed 30 miles/second , relative to E, but its velocity would also have a Y-Axis component.

Question: Would the projectile continue to move along the Y axis at speed 60 miles/second relative to E (ie. Would the Y component of its velocity, relative to E, be the same as the Y component of ABC's velocity?) or would relativity start messing around with its Y velocity from E's perspective? What about from the perspective of F, which is independently travelling parallel to the X axis at some constant speed, relative to E?

Question: Can we say that the line DB is always perpendicular to the line ABC, or would relativity start messing around with space? eg. would DB be perpendicular to ABC from the perspective of A, but not from the perspective of E or some such oddness? What about from the perspective of F, which is independently travelling parallel to the X axis at some constant speed, relative to E?






[Edited 1 time, last edit on 5/10/2011 at 20:57 (GMT -5) by Caladriel]
Darren Grey
Registered user

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4210 days, 17 hours, 58 minutes and 25 seconds ago.
Posted on Wednesday, May 11, 2011 at 14:11 (GMT -5)

From E's perspective, relativity would start messing around with things. Same as from F's perspective. However from ABC's perspective D would stay still relative to them along the y-axis at all times, as would its little fired off things, as they are in the same frame of reference.

Exactly how the line would look from E or F's perspective I couldn't exactly say, cause relativity can really feck with your head on these matters :/
Waldenbrook, the dwarven shopkeeper, mumbles: "I'd offer 9 gold pieces for yer dwarven child corpse."

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