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There's a spaceship that's traveling at 0.900c relative to earth. The astronaut’s heart rate is measured...

There's a spaceship that's traveling at 0.900c relative to earth. The astronaut’s heart rate is measured on the spaceship at 60 beats/minute.

* What is the heart rate measured by an observer in the moving reference frame?

* What's the heart rate measured by an observer able to view this time interval from Earth?

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