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Physics 13 Online
OpenStudy (anonymous):

A spacecraft is in an elliptical orbit around the Earth. At time t=0 hours, it is at its apogee d=1000 km about the Earth's surface. Fifty minutes later it is at its perigee d=100 km above the surface. Assuming that d varies sinusoidally with time, wirte and equation expressing d in terms of t.

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