4. A satellite is on a circular orbit 3600km above ground. How much speedincrease is needed for it t
問題詳情
4. A satellite is on a circular orbit 3600km above ground. How much speedincrease is needed for it to escape from Earth's gravity? (A) 11.2 km/s； (B)3.3 km/s； (C)6.4 km/s； (D) 2.6 km/s； (E) 1.0 km/s.