题目内容
如图所示,AO绳和BO绳共同悬挂一个重物,现将绳子AO由如图所示的位置缓慢移到竖直方向, O点位置不变,OB绳始终保持水平,该过程中,下列说法中正确的是( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241234533481230.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241234533481230.png)
A.OA绳子拉力减小 | B.OA绳子拉力先减小后增大 |
C.OB绳子拉力减小 | D.OB绳子拉力增大 |
AC
本题考查物体的平衡。对O点受力分析,设OA与竖直方向夹角为
,
,
,AO由如图所示的位置缓慢移到竖直方向
减小,
减小,
减小,选AC。
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824123453364297.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824123453395811.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824123453457750.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824123453364297.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824123453520373.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824123453551373.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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