2. The Moon orbits Earth each 27.3 days and it has an average distance of 3.84×10⁸ m from the center of Earth. Calculate the period of an artificial satellite orbiting at an average altitude of 1500 km above Earth's surface. The radius of Earth is 6380 km.
(A) 0.57 hr
(B) 1.9 hr
(C) 5.7 hr
(D) 19 hr
(E) 57 hr

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