A spaceship moving relative to an observer with a speed of.70c shines a beam of

Question

A spaceship moving relative to an observer with a speed of.70c shines a beam of light in the forward direction, directlytoward the observer. Use equation 29-4 to calculate the speed ofthe beam of light relative to the observer. eq 29-4 : v21+v13 / 1 +(v21v13/c2) A spaceship moving relative to an observer with a speed of.70c shines a beam of light in the forward direction, directlytoward the observer. Use equation 29-4 to calculate the speed ofthe beam of light relative to the observer. eq 29-4 : v21+v13 / 1 +(v21v13/c2)

Explanation / Answer

   Speed of spaceship   v21   =   0.70c    speed oflight   v13   =   c    relativespeed   v   =    (v21+v13)/ {1 + (v21v13/c2)}                                  =   (0.70c   +   c)/{1   +   0.70c* c / c2)                                  =   1.70c/ 1.70                                  =   c                                                                    

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