嫦娥一号奔月成功这一事件极大地提高了同学们对月球的关注程度。

嫦娥一号奔月成功这一事件极大地提高了同学们对月球的关注程度。以下是有关月球知识的几个问题,请解答:(已知月球质量为M,半径为R,万有引力常数为G

(1)若在月球上以初速度v1竖直上抛一个物体,物体上升的最大高度h1为多少?
(2)若在月球上荡秋千,将人视为质点,秋千质量不计、摆长不变、摆角小于90°,若秋千经过最低点位置的速度为v2,人能上升的最大高度h2为多少?
(3)若在月球上发射一颗绕它运行的卫星,则发射卫星的最小速度v3为多少?


答案

(1)G=mg G M =gR2g = h1= = (2)mg h2=mv22 h2= = (3)G=mRv32 = ,v3=

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