An alarm clock is set to sound in 20 h at t 0 the clock is
An alarm clock is set to sound in 20 h. At t = 0, the clock is placed in a spaceship moving with a speed of 0.72c (relative to Earth). What distance, as determined by an Earth observer, does the spaceship travel before the alarm clock sounds?
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an alarm clock is set to sound in 20 h at t 0 the clock is placed in a spaceship moving with a speed of 072c relative
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