問題詳情
5. A space craft is launched from the surface of the Earth with a heliocentricspeed of 42 km/s (the speed relative to the Sun). What is its speed whenit reaches a distance of 5 AU from the Sun? Note: you have to include thegravitational potential of the Earth as well as the Sun in the calculation.
(A)12 km/s；
(B) 15km/s；
(C)18 km/s；
(D) 21 km/s；
(E) 24km/s.
參考答案
答案：B
難度：計算中-1
書單：沒有書單，新增