题目内容
宇宙中,两颗靠得比较近的恒星,只受到彼此之间的万有引力作用互相绕转,称之为双星系统,设某双星系统绕其连线上的O点做匀速圆周运动,如题图所示.若AO<OB,则
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/2014082419171925812906.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/2014082419171925812906.png)
A.双星的总质量一定,转动周期越小,双星之间的距离就越小 |
B.星球A的向心力一定大于B的向心力 |
C.星球A的质量一定小于B的质量 |
D.星球A的线速度一定大于B的线速度 |
A
试题分析:此双星质量分别为
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824191719492372.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824191719757395.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824191720007320.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824191720256349.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824191719492372.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824191720833929.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824191719757395.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824191721395928.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824191721629633.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241917219101002.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824191719492372.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824191720833929.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824191719757395.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824191721395928.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824191723407658.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824191723641440.png)
故选A
点评:解决本题的关键知道双星靠相互间的万有引力提供向心力,具有相同的角速度.以及会用万有引力提供向心力进行求解.
![](http://thumb2018.1010pic.com/images/loading.gif)
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