题目内容
如图所示,在同一轨道平面上的几个人造地球卫星A、B、C,在某一时刻恰好在同一直线上,下列正确说法有( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824170959472574.gif)
A.根据
,可知VA<VB<VC
B.根据万有引力定律,FA>FB>FC
C.向心加速度aA>aB>aC
D.运动一周后,A先回到原地点
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824170959472574.gif)
A.根据
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824170959597533.png)
B.根据万有引力定律,FA>FB>FC
C.向心加速度aA>aB>aC
D.运动一周后,A先回到原地点
CD
试题分析:设地球的质量为M,卫星的轨道半径为r,卫星的速度
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824171000002742.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824171000533570.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824171000782834.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824171001079711.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824171001516567.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241710019681098.png)
故选CD
点评:对于卫星的线速度、周期、角速度、向心加速度等物理量的比较,只要抓住卫星的速度公式
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824171000002742.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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