What will this rate be as measured-observer at rest on earth

Reference no: EM13652619

An astronaut at rest on Earth has a heartbeat rate of 72 beats/min. When the astronaut is traveling in a spaceship at 0.90c, what will this rate be as measured by the following:

a) an observer also in the ship
beats/min
b) an observer at rest on Earth
beats/min

Reference no: EM13652619

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