题目内容
如图所示,质量为m的物体用细绳拴住放在水平粗糙传送带上,物体距传送带左端距离为L,稳定时绳与水平方向的夹角为θ,当传送带分别以v1、v2的速度作逆时针转动时(v1<v2),绳中的拉力分别为Fl、F2;若剪断细绳时,物体匀加速运动到达左端的时间分别为tl、t2,则下列说法正确的是( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250009425492884.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250009425492884.jpg)
A.![]() | B.![]() | C.![]() | D.![]() |
BC
试题分析:设物体与传送带之间的摩擦因数为
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000942659301.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000942674700.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000942690884.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000942705575.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250009427211081.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000942612439.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000942752459.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000942768621.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000942627406.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250009427993675.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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A.![]() | B.![]() | C.![]() | D.![]() |