题目内容
如图所示,我国国家大剧院外部呈椭球型,一警卫人员为执行特殊任务,必须冒险在椭球型屋顶向上缓慢爬行,他在向上爬的过程中
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408242339294212242.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408242339294212242.jpg)
A.屋顶对他的支持力变大 | B.屋顶对他的支持力变小 |
C.屋顶对他的摩擦力变大 | D.屋顶对他的摩擦力变小 |
AD
试题分析:此人受力分析如图所示,
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408242339297644240.jpg)
此人受静摩擦力:
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824233930310680.png)
屋顶对他的支持力:
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824233931215779.png)
随着向上缓慢爬行,角度
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824233932759297.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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