Determine what speed an artificial Earth satellite must have to hover above its surface at an altitude of 100 km.

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

Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.