题目内容
在同一轨道平面上的几个人造地球卫星A、B、C,在某一时刻恰好在同一直线上,则
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241306381581849.png)
A.根据
,可知
<
<![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824130638314379.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824130638330168.png)
B.向心加速度
>
>![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824130638517389.png)
C.根据万有引力定律,有
>
>
D.运动一周后,A先回到原点
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241306381581849.png)
A.根据
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824130638221509.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824130638252355.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824130638283355.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824130638314379.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824130638330168.png)
B.向心加速度
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824130638424359.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824130638455361.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824130638517389.png)
C.根据万有引力定律,有
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824130638564375.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824130638642375.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824130638658392.png)
D.运动一周后,A先回到原点
BD
由
推得
,可知
>
>
,A错误;
可知B正确;F=G
,不知道卫星的质量关系,所以万有引力无法比较大小,C错误;
可知A的周期最小,A先回到原点,D正确。
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824130638689902.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824130638704742.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824130638252355.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824130638283355.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824130638314379.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824130638814723.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824130638829563.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824130638860981.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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