题目内容
2013年6月13日13时18分,“神舟10号”载人飞船成功与“天宫一号”目标飞行器交会对接.如图所示,“天宫一号”对接前从圆轨道Ⅰ变至圆轨道Ⅱ,已知地球半径为R,轨道Ⅰ距地面高度h1,轨道Ⅱ距地面高度h2,则关于“天宫一号”的判断正确的是
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250035542375090.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250035542375090.jpg)
A.调整前后线速度大小的比值为![]() |
B.调整前后周期的比值为![]() |
C.调整前后向心加速度大小的比值为![]() |
D.需加速才能从轨道Ⅰ变至轨道Ⅱ |
B
试题分析:根据万有引力提供向心力有:
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250035545171381.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003554549742.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003554564967.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003554580720.png)
所以线速度大小之比为
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003554611880.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250035546271146.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250035546421045.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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