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,转动周期为T,轨道半径分别为
、
且
,引力常量G已知,则下列说法正确的是( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241724054771359.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824172404635362.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824172404931370.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824172405243508.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241724054771359.png)
A.星体A的向心力大于星体B的向心力 |
B.星球A的线速度一定大于星体B的线速度 |
C.星球A和星体B的质量之和为![]() |
D.双星的总质量一定,若双星之间的距离增大,其转动周期也变大 |
CD
试题分析:A、两星体之间的万有引力作为它们做圆周运动的向心力,所以星体A的向心力等于星体B的向心力;错误
B、双星系统具有相同的角速度,
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824172405929551.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824172406210549.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824172405243508.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824172406709471.png)
C、由
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241724071311341.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241724073961247.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241724077861264.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241724079891273.png)
D、由
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241724079891273.png)
故选CD
点评:双星问题中,双星具有相同的周期、角速度、向心力,双星质量不等,满足关系
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824172408644569.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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