题目内容
“天宫一号”某次变轨,离地高度由200km升至362km,假定变轨前后均做匀速圆周运动,变轨后“天宫一号”的
A.加速度增大 | B.周期变小 | C.线速度变小 | D.向心力变大 |
C
根据
,距离变大,万有引力变小,D错;加速度变小,A错;
,r变大,v减小,C正确。T=
=
,r变大,T减小。B错误。![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824130557895169.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824130557801989.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824130557817732.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824130557848547.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824130557863805.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824130557895169.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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题目内容
A.加速度增大 | B.周期变小 | C.线速度变小 | D.向心力变大 |