题目内容
如图所示,长为L=4m的传送带的速度是5 m/s,现将m="1" kg 的小物体轻放在左轮正上方的皮带上,物体与皮带间的动摩擦因数μ=0.2,电动机带动皮带将物体从左轮运送到右轮的过程中,下列说法中正确的是
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408242300364681374.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408242300364681374.png)
A.小物体获得的动能为12.5J |
B.小物体获得的动能为8J |
C.摩擦产生的热量为8J |
D.摩擦产生的热量为12J |
BD
试题分析:对小物体运用动能定理:
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824230037809831.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824230038995687.png)
小物体获得的动能
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824230040368833.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408242300413511111.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824230042255568.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824230043644530.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824230045017539.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824230046296769.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824230047528509.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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