题目内容
如图(俯视)所示,完全相同的四个足球彼此相互接触叠放在水平面上处于静止状态,每个足球的质量都是
,不考虑转动情况,下列说法正确的是(重力加速度为g)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250012451483308.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001245101337.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250012451483308.png)
A.下面每个球对地面的压力均为![]() |
B.下面的球不受地面给的摩擦力 |
C.下面每个球受地面给的摩擦力均为![]() |
D.上面球对下面每个球的压力均为![]() |
AC
试题分析:据题意,这四个球的总重力为
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001245241714.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001245257768.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001245444663.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250012454601020.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001245491808.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001245678681.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001245694752.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001245803664.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250012459591110.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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