A lighthouse sweeps its beam of light around in a circle
A lighthouse sweeps its beam of light around in a circle once every 7.5 s. To an observer in a spaceship moving away from Earth, the beam of light completes one full circle every 15 s. What is the speed of the spacecraft relative to Earth?
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A 2016 survey of undergraduate students considered this further and found that compared with students that did not use cannabis at least once
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