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>"I am told to use the SR 'velocity addition' formula >when I want to see how a velocity changes with change >of frame. And I can use it *only if* I expect the >change to be nonzero." > >The second sentence is his own invention, not any >requirement of SR. But I predict he will never >understand this. A point none of you has raised is that it is the numerical value of c which is important in the SR equation. The 'c' in the moving source's frame has the same numerical value as the 'c' in the equation and in the answer. However, in the observer frame, the first 'c' is NOT the same as the second! Get it! |
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Index Original post and context: 3c64892a.4143391@news.bigpond.com |