题目内容
(12分)在光滑水平面上静置有质量均为m的木板AB和滑块CD,木板AB上表面粗糙.动摩擦因数为
,滑块CD上表面是光滑的1/4圆弧,其始端D点切线水平且在木板AB上表面内,它们紧靠在一起,如图所示.一可视为质点的物块P,质量也为m,从木板AB的右端以初速度v0滑上木板AB,过B点时速度为v0/2,又滑上滑块CD,最终恰好能滑到滑块CD圆弧的最高点C处,求:
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250052357741845.jpg)
(1)物块滑到B处时木板的速度vAB;
(2)木板的长度L;
(3)滑块CD圆弧的半径R.
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825005235743301.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250052357741845.jpg)
(1)物块滑到B处时木板的速度vAB;
(2)木板的长度L;
(3)滑块CD圆弧的半径R.
(1)
(2)
(3)![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825005235852696.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825005235805449.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825005235821793.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825005235852696.png)
试题分析:(1)对ABC用由动量守恒得
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825005235868780.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825005235883552.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825005235899592.png)
(2)由A到B,根据能量守恒得
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250052359301379.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825005235821793.png)
(3)由D点C,滑块CD与物块P的动量守恒且机械能守恒,得
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825005235961955.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250052359921483.png)
解之得:
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250052360241097.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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