题目内容
如图所示,A、B、C三颗人造地球卫星绕地球做匀速圆周运动,已知mA=mB<mC,则三颗卫星
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250053205624920.png)
A.线速度大小关系:vA<vB=vC B.加速度大小关系:aA>aB=aC
C.向心力大小关系: FA=FB<FC D.周期关系:TA>TB=TC
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250053205624920.png)
A.线速度大小关系:vA<vB=vC B.加速度大小关系:aA>aB=aC
C.向心力大小关系: FA=FB<FC D.周期关系:TA>TB=TC
B
试题分析:人造卫星绕地球做匀速圆周运动,万有引力提供向心力,设卫星的质量为m、轨道半径为r、地球质量为M,由图示可知:rA<rB=rC,由题意知:mA=mB<mC;由牛顿第二定律得:
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250053205931525.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825005320593763.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825005320608753.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825005320624897.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250053206401003.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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