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Question: suppose that while lying on a beach near the equator...

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Suppose that, while lying on a beach near the equator of a far-off planet watching the sun set over a calm ocean, you start a stopwatch just as the top of the sun disappears. You then stand, elevating your eyes by a height H = 1.35 m, and stop the watch when the top of the sun again disappears. If the elapsed time is t = 10.1 s, what is the radius r of the planet to two significant figures? Notice that duration of a solar day at the far-off planet is the same that is on Earth.

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