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A satellite is in circular orbit at an altitude of 1800 km above the surface of...

A satellite is in circular orbit at an altitude of 1800 km above the surface of a nonrotating planet with an orbital speed of 3.7 km/s. The minimum speed needed to escape from the surface of the planet is 8.4 km/s, and G = 6.67 × 10-11 N · m2/kg2. The orbital period of the satellite is closest to

59 min.
83 min.
75 min.
67 min.
51 min.
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