题目内容
已知月球绕地球运动周期T和轨道半径r,地球半径为R求(1)地球的质量?(2)地球的平均密度?
(1)地球的质量为![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824134520846943.png)
(2)地球平均密度为![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241345208931366.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824134520846943.png)
(2)地球平均密度为
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241345208931366.png)
解:设月球质量为m,月球绕地球做匀速圆周运动,
则:
(3分)
(4分)
(2)地球平均密度为
(7分)
则:
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241345210651128.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824134520846943.png)
(2)地球平均密度为
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241345208931366.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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