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An astronaut at rest has a heartbeat of 60 beats/min. What will the rate be when the astronaut is traveling on a spaceship that moves at 0.89c as measured by (a) by an observer also in the ship? (b) by an observer at rest on the Earth?

An astronaut at rest has a heartbeat of 60 beats/min. What will the

rate be when the astronaut is traveling on a spaceship that moves at 0.89c as measured by
(a) by an observer also in the ship?
(b) by an observer at rest on the Earth?

 
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