题目内容
三个相同的光滑圆柱体a、b、c静止地叠放在两个等高的支架上,其横截面如图所示。a、b,的圆心与左支架的支点在一条直线上;a、c的圆心与右支架的支点在一条直线上。设三个圆柱体的质量均为m,则
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408242252500425243.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408242252500425243.png)
A.两支架对圆柱体b、c的支持力大小均为![]() |
B.两支架对圆柱体b、c的支持力大小均为![]() |
C.b、c之间一定有弹力 |
D.b、c之间可能无弹力 |
AC
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824225254114168.png)
试题分析:以三个光滑圆柱体a、b、c组成的整体为研究对象,受力情况如图,
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/2014082422525500310889.png)
作出两支持力的合力,由平衡条件及几何关系知,
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824225256111503.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824225256797297.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824225257640379.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408242252585131218.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824225259324432.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824225259793372.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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