7. Consider an artificial satellite moves in an orbit which is 100-km high from the earth surface. Assume the earth radius is 6400 km and the gravitational acceleration on earth surface is 9.8 m/sec². What is the period of the satellite?
(A) ~8000 sec
(B) ~6400 sec
(C) ~5800 sec
(D) ~5200 sec
(E) ~4600 sec

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