题目内容
如图所示,a、b、c是地球大气层外圆形轨道上运行的三颗人造地球卫星,a、b质量相同,且小于c的质量,则( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408242027479261835.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408242027479261835.jpg)
A.b所需向心力最大 |
B.b、c周期相等,且小于a的周期 |
C.b、c向心加速度相等,且小于a的向心加速度 |
D.b、c的线速度大小相等,且小于a的线速度 |
CD
试题分析:人造地球卫星做圆周运动的向心力由万有引力提供,根据
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824202748566834.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408242027493921088.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824202750672967.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824202751545848.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824202752544735.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824202753417902.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824202754057742.png)
故选CD
点评:解决本题的关键掌握万有引力提供向心力
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408242027551641376.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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