Determine what speed an artificial Earth satellite must have to hover above its surface at an altitude of 100 km.
November 11, 2020
The earth makes a revolution on its axis in 24 hours, or 24 hours × 3600 s = 86 400 s.
The speed is determined by the formula: V = S: t
S = 2 πr = 2 × 3.14 × (6371 + 100 km) = 40 637.88 km
V = 40 637.88 km: 86 400 s = 0.47 km / s
Answer: 0.47 km / s
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