Does Moving Train See Stationary Observer at .6c? - I'm Not Sure

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Discussion Overview

The discussion revolves around the relativistic effects observed between a moving train and a stationary observer, specifically addressing how each perceives the other's velocity. The scope includes theoretical considerations of special relativity and the application of the Lorentz Transform.

Discussion Character

  • Technical explanation, Conceptual clarification, Debate/contested

Main Points Raised

  • One participant questions whether the moving train perceives the stationary observer as moving at 0.6c from its frame of reference.
  • Another participant asserts that the train sees the observer moving at -0.6c when applying the standard configuration for the Lorentz Transform.
  • A different viewpoint suggests that in terms of "velocity," both the train and the observer see each other moving at 0.6c, but this may differ when considering "speed" in the context of relativity.
  • It is noted that the Lorentz Transform will not yield reciprocal results if 0.6c is used for transformations between frames, indicating that -0.6c must be used for the reverse transformation to maintain consistency.

Areas of Agreement / Disagreement

Participants express differing views on how velocities are perceived between the moving train and the stationary observer, indicating that multiple competing interpretations remain unresolved.

Contextual Notes

There are limitations related to the definitions of "velocity" and "speed," as well as the assumptions underlying the application of the Lorentz Transform, which are not fully explored in the discussion.

goodabouthood
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A stationary observer sees a moving train going at .6c.

Does the moving train see the stationary observer going .6c from his frame of reference as well?

I want to say yes but I'm not sure.
 
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Yes, but if we want to use the standard configuration for the Lorentz Transform, we say that the train sees the observer moving at -0.6c.
 
Yes in terms of "velocity". In terms of the "speed", which is what relativity normally deals with, each sees the other as moving at 0.6c.
 
The Lorentz Transform which is so very important in Special Relativity will not be reciprocal if you use 0.6c when transforming from one frame to the other and back again. If you use 0.6c when transforming an event from the first frame into the second frame then you must use -0.6c when you transform that event back into the first frame if you expect to get the same event you started with.
 

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