题目内容
(6分)如图所示,在水平地面上有一向右匀速行驶的车,车内用绳AB与绳BC拴住一个小球,BC绳水平,AB绳与竖直方向夹角
为370,小球质量为0.8kg,小球在车中位置始终未变(g取10m/s2,sin370=0.6,cos370="0.8)" 。
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250010182581954.png)
求:(1)AB绳的拉力大小 (2)BC绳的拉力大小
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001018242297.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250010182581954.png)
求:(1)AB绳的拉力大小 (2)BC绳的拉力大小
(1)10N(2)6N
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001018273811.png)
试题分析:(1)取小球为研究对象,其受力分析如图。当车匀速行驶时,合力为零。
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001018289809.png)
则
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001018289987.png)
(2)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001018305818.png)
则
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001018320932.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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