题目内容
如图所示,有三颗绕地球作匀速圆周运动的人造卫星
、
、
,它们的轨道半径之间的关系是
,它们的质量关系是
。则下列说法中正确的是
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/2014082412530541213219.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824125305272287.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824125305303308.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824125305334252.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824125305350544.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824125305381614.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/2014082412530541213219.png)
A.它们的线速度大小关系是![]() |
B.它们所受到的向心力大小关系是![]() |
C.它们的周期大小关系是![]() |
D.它们的角速度大小关系是![]() |
B
根据万有引力提供向心力可得:
,可得线速度:
,因为
,所以
,故A错误
因为
,
,
,可知
,因为
,
,
,可知
,综合可知
,故B正确
周期
,因为
,所以可得
,故C错误
角速度
,因为
,所以可得
,故D错误
所以选B
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241253055681385.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824125305584732.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824125305600459.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824125305631481.png)
因为
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824125305662407.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824125305693469.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824125305740747.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824125305756449.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824125305834397.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824125305865443.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824125305740747.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824125305927421.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824125305958483.png)
周期
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824125305974966.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824125305600459.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824125306052490.png)
角速度
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824125306130825.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824125305600459.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824125306177525.png)
所以选B
![](http://thumb2018.1010pic.com/images/loading.gif)
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