A lighthouse sweeps its ray of light around in a circle
A lighthouse sweeps its ray of light around in a circle once every 7.4 s. To an observer in a spaceship moving away from Earth, the ray of light completes one full circle every 11 s.
What is the speed of the spaceship relative to Earth?
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a lighthouse sweeps its ray of light around in a circle once every 74 s to an observer in a spaceship moving away from
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