题目内容
如图所示为粮袋的传送装置,已知AB间长度为L,传送带与水平方向的夹角为
,工作时逆时针运行速度为v,粮袋与传送带间的动摩擦因数为
,正常工作时工人在A点将粮袋轻放到运行中的传送带上,关于粮袋从A到B的运动,以下说法正确的是(设最大静摩擦力等于滑动摩擦力)( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250018447913372.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001844744284.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001844760256.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250018447913372.jpg)
A.只要![]() |
B.粮袋开始运动的加速度为![]() ![]() |
C.无论![]() ![]() |
D.要使货物尽快到达B端,传送带的速度至少![]() |
BC
试题分析:据题意,传送带逆时针转动,物体从A静止释放,两者速度不等一定相对滑动,粮袋必定有加速过程A错;粮袋加速时所受摩擦力沿斜面向下
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250018451811031.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001845212802.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001845306551.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001845321960.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250018453371162.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001845352614.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250018453991226.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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