
#19
Aug2910, 04:10 PM

Sci Advisor
P: 8,470

edit: beaten to it by bcrowell! 



#20
Aug2910, 04:23 PM

P: 19

Yeah 



#21
Aug2910, 05:29 PM

Sci Advisor
P: 8,470

x' = x  c*t t' = t If you pick any event on the light beam's path with coordinates t and x=ct, then according to this coordinate transformation, in the noninertial frame the event always has position coordinate x'=0, regardless of the t' coordinate, so the light beam must be at rest in this coordinate system. But since this coordinate transformation also says the t' coordinate of any event in the noninertial frame is exactly the same as the t coordinate of the event in the inertial frame, there is no time dilation between the two frames! If a clock is ticking at a rate of 1 tick per second of coordinate time in the inertial frame, it's still ticking at a rate of 1 tick per second of coordinate time in the noninertial frame. On the other hand, here's a different noninertial frame where the light is still at rest, but now all clocks are slowed down by a factor of 1000 relative to the inertial frame: x' = x  c*t t' = 1000*t And you could come up with plenty of weirder transformations which gave coordinate systems where the light was at rest, like this: x' = 1.2*(9tc/x)*(x  c*t) t' = 35*(t^2*c/8x + 19x/c) The point is that there is a unique physical procedure for defining an inertial rest frame for a slowerthanlight object moving inertially, but no such uniqueness for noninertial frames. 



#22
Aug2910, 07:03 PM

P: 19

Wow thats a mouthful. I am starting to understand the concept now. Let me just read this over a few times :)
Thanks for all the help on the subject. I appreciate your time. 



#23
Aug2910, 07:22 PM

P: 19

Actually, do you know of any good books i can read on the topic? Relativity i mean.




#24
Aug2910, 07:55 PM

P: 125

http://www.amazon.com/SpecialRelati...3130007&sr=81 



#25
Aug3010, 01:09 PM

Sci Advisor
P: 8,470

Relativity for the Questioning Mind wikibook on SR Another good conceptual introduction is Geroch's General Relativity from A to B, which also has a lot on special relativity. 



#26
Aug3010, 03:10 PM

P: 5,634

A convenient set of discussions on relativity:
http://www.mathpages.com/rr/rrtoc.htm and Ben Crowell's: http://www.lightandmatter.com/genrel/ and a shorter book by a student of Einstein's, easy/light math,inexpensive used via AMAZON THE RIDDLE OF GRAVITATION, Peter Bergmann also, don't let some of the stricter responses above deter you from thinking about moving along with a beam of light if that's what you like...or any other way you'd like...such thoughts can lead to legitimate insights.....after all it got Einstein started.....!!!! Thinking about things the way everyone else says they should be thought about might make new insights difficult.... 


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