题目内容
某月球探测卫星先贴近地球表面绕地球做匀速圆周运动,此时其动能为
,周期为
;再控制它进行一系列变轨,最终进入贴近月球表面的圆轨道做匀速圆周运动,此时其动能为
,周期为
,已知地球的质量为
,月球的质量为
,则
为
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003953494405.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003953510319.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003953525426.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003953541365.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003953557433.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003953588461.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003953603562.png)
A.![]() | B.![]() | C.![]() | D.![]() |
C
试题分析:卫星绕地球做匀速圆周运动,设卫星质量为m,轨道半径为r1,运动线速度为v1,
因为动能为:
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003953697782.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003953713874.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250039537281170.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250039537441142.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250039537591165.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250039537911327.png)
故C正确,ABD错误.故选C.
![](http://thumb2018.1010pic.com/images/loading.gif)
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A.![]() | B.![]() | C.![]() | D.![]() |