You are traveling in a spaceship at a speed of0.94 c away from Earth. You send a

Question

You are traveling in a spaceship at a speed of0.94c away from Earth. You send a laser beam toward Earthtraveling at velocity c relative to you. What do observerson the Earth measure for the speed of the laser beam?
c v2 = (v1 - v) / (1 - v1 v /c2 v2 = speed of laser beam measured on earth v1 = speed of laser beam measured in moving frame =-c v = speed of moving frame = .94 c v2 = (-c - .94 c) / (1 - (-1 * .94)) =-c     speed of light = c in all frames c=2.00 You are traveling in a spaceship at a speed of0.94c away from Earth. You send a laser beam toward Earthtraveling at velocity c relative to you. What do observerson the Earth measure for the speed of the laser beam?
c v2 = (v1 - v) / (1 - v1 v /c2 v2 = speed of laser beam measured on earth v1 = speed of laser beam measured in moving frame =-c v = speed of moving frame = .94 c v2 = (-c - .94 c) / (1 - (-1 * .94)) =-c     speed of light = c in all frames c=2.00 v2 = (v1 - v) / (1 - v1 v /c2 v2 = speed of laser beam measured on earth v1 = speed of laser beam measured in moving frame =-c v = speed of moving frame = .94 c v2 = (-c - .94 c) / (1 - (-1 * .94)) =-c     speed of light = c in all frames c=2.00 v2 = (v1 - v) / (1 - v1 v /c2 v2 = speed of laser beam measured on earth v1 = speed of laser beam measured in moving frame =-c v = speed of moving frame = .94 c v2 = (-c - .94 c) / (1 - (-1 * .94)) =-c     speed of light = c in all frames c=2.00 v2 = speed of laser beam measured on earth v1 = speed of laser beam measured in moving frame =-c v = speed of moving frame = .94 c v2 = (-c - .94 c) / (1 - (-1 * .94)) =-c     speed of light = c in all frames c=2.00

Explanation / Answer

v2 = - c means observer on earth measuresspeed of laser beam as c moving               in the -x direction;   v2 is the speedmeasured in the earth frame

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