G = 6.67 × 10-11 N•m2/kg2
Mearth = 5.98 × 1024 kg
R = v2/GM = 40002/(6.67 × 10-11 × 5.98 × 1024) = 24.93 × 106 m.
An earth satellite moves in a circular orbit at a speed of 4000 m/s. What is its orbital period?
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