Suppose that, while lying on a beach near the equator 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 _x0001_ 1.70 m, and stop the watch when the top of the sun again disappears. if the elapsed time is t _x0001_ 11.1 s, what is the radius r of earth?
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radius of earth is 6400 km
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the earth radius is 6400 km
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