题目内容
某人造卫星绕地球做匀速圆周运动,设地球半径为R,地面重力加速度为g。下列说法正确的( )
A.人造卫星的最小周期为![]() |
B.卫星在距地面高度R处的绕行速度为![]() |
C.卫星在距地面高度R处的加速度为![]() |
D.地球同步卫星的速率比近地卫星的速率小,所以发射同步卫星所需的能量较小 |
C
试题分析:人造卫星绕地球做圆周运动的向心力由万有引力提供,即
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250014383261092.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001438342967.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001438357873.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001438357767.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250014383881114.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001438357873.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001438404640.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250014384201024.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001438357873.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001438451478.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001438357873.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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