题目内容
如图所示,水平传送带A、B两端相距S=3.5m,工件与传送带间的动摩擦因数μ=0.1。工件滑上A端瞬时速度VA=4 m/s,达到B端的瞬时速度设为VB ,则:(重力加速度g取10m/s2)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250022117563026.jpg)
A.若传送带不动,则VB=3m/s
B.若传送带以速度V=6m/s逆时针匀速转动,则在到达B端前已返回
C.若传送带以速度V=2m/s顺时针匀速转动,VB=2m/s
D.若传送带以速度V=6m/s顺时针匀速转动,VB=3m/s
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250022117563026.jpg)
A.若传送带不动,则VB=3m/s
B.若传送带以速度V=6m/s逆时针匀速转动,则在到达B端前已返回
C.若传送带以速度V=2m/s顺时针匀速转动,VB=2m/s
D.若传送带以速度V=6m/s顺时针匀速转动,VB=3m/s
A
试题分析:据题意,物体从A运动到B的过程中水平方向受到向左的摩擦力f,则有:
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002211772891.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002211788569.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002211788569.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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