1. A spaceship moving at 90% of the speed of light (or 0 . 9 c ) passes by a spa

Question

1. A spaceship moving at 90% of the speed of light (or 0.9c) passes by a space station. The ship is 450 m long in its rest frame. (10 points each part)

(a) How long does the spaceship appear to be as viewed from the space station?

(b) The space station sends out a series of light blinks, at a frequency of one blink per second. What apparent speed of these blinks do the crew on the moving spaceship observe?

(c) The space ship launches a probe traveling at 0.8c) relative to the ship, in the same direction that the ship is traveling in. What speed is observed for the probe by the space station?

Explanation / Answer

a) L = 450*sqrt(1 - 0.81) = 196.15m

b) c = speed of light = 3*10^8m/s

c) speed of light

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