ch37-p027 - 27. (a) One thing Einsteins relativity has in...

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27. (a) One thing Einstein’s relativity has in common with the more familiar (Galilean) relativity is the reciprocity of relative velocity. If Joe sees Fred moving at 20 m/s eastward away from him (Joe), then Fred should see Joe moving at 20 m/s westward away from him (Fred). Similarly, if we see Galaxy A moving away from us at 0.35 c then an observer in Galaxy A should see our galaxy move away from him at 0.35 c , or 0.35 in multiple of
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