题目内容
一人造地球卫星绕地球做匀速圆周运动,假如该卫星变轨后仍做匀速圆周运动,速度减小为原来的一半,不考虑卫星质量的变化,则变轨前后卫星的( )
A.向心加速度大小之比为4:1 | B.角速度大小之比为2:1 |
C.周期之比为1:8 | D.轨道半径之比为1:2 |
C
试题分析:卫星绕地球做匀速圆周运动
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824165121636902.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241651218551134.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824165122245303.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824165122432338.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824165122635546.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824165122853362.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824165123087513.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824165123306352.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824165123571614.png)
故选C
点评:本题关键根据万有引力提供向心力,求出表达式,再进行比较求解
![](http://thumb2018.1010pic.com/images/loading.gif)
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