题目内容
如图所示,足够长的水平传送带AB以v1="2" m/s的速度向左匀速运动(传送带的传送速度恒定),质量为M="1" kg的木块以v0="3" m/s水平向右的速度滑上传送带,木块与传送带间的动摩擦因数
=0.5;则从木块滑上传送带到离开产生的内能为
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241452286642265.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824145228602301.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241452286642265.png)
A.2J | B.4.5J |
C.10.5J | D.12.5J |
D
试题分析:在整个过程中,只有木块相对皮带滑动时才会有摩擦力,才会产生内能,由
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824145228727652.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824145228789566.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824145228898748.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824145228976735.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241452290541091.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824145229117814.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824145229226651.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824145229288874.png)
故选D
点评:难题。本题关键是算出木块相对皮带的路程。
![](http://thumb2018.1010pic.com/images/loading.gif)
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