题目内容
⑴若已知地球半径为R,地球表面的重力加速度为g,月球绕地球运动的周期为T,且把月球绕地球的运动近似看做是匀速圆周运动。则月球绕地球运动的轨道半径为
⑵若某位宇航员随登月飞船登陆月球后,在月球表面某处以速度v0竖直向上抛出一个小球,经过时间t,小球落回到抛出点。已知月球半径为R月,万有引力常量为G。则月球的密度为
⑵若某位宇航员随登月飞船登陆月球后,在月球表面某处以速度v0竖直向上抛出一个小球,经过时间t,小球落回到抛出点。已知月球半径为R月,万有引力常量为G。则月球的密度为
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004807797913.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004807828989.png)
试题分析: 设地球的质量为M,月球的质量为m,由万有引力充当向心力,有:
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250048078591293.png)
在地球表面附近有:
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004807875929.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004807797913.png)
小球做竖直上抛运动,则由
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004807906610.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004807937622.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004807953896.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250048079681113.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250048079991181.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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