novop
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Homework Statement
Homework Equations
The Attempt at a Solution
First off this isn't really homework, just a problem I can't seem to wrap my head around. I worked through the questions in the frame of the Earth and got the right answers:
a) 12:50
b) 7.2 x 10^11 m
c) 1:30
d) doesn't matterSolving (c) in the Earth frame is easy. The rocket is moving away from the Earth with v = 0.8c, emits a pulse at v=c at a distance 7.2 x 10^11 m away, so time is just d/v.
My question is in solving part (c) in the frame of the rocketship. In this frame, the Earth is moving away from the rocketship with v=-0.8c, so now there is a relative speed (-0.2c) between the pulse emitted from the rocket (stationary in this frame) and the Earth moving away with v=-0.8c.
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