题目内容
在雨后乡间的大道上,有一汽车的后轮陷在湿滑的路面上而抛锚,尽管司机加大油门,后轮仍陷其中.于是司机找出一根长绳,一端系在路旁的树上,另一端系在车上,并使绳绷紧,如图3-5-10所示,然后在绳的中央,沿垂直于绳的方向用力拉绳,就可以把车拉出,试分析原因.
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241204226071742.jpg)
图3-5-10
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241204226071742.jpg)
图3-5-10
可克服车受的阻力.
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241204226231605.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241204226231605.jpg)
分析O点受力图如下图所示,FT=
,在θ→90°时,cosθ→0,则FT很大,即可克服车受的阻力.
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241204226231605.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120422623618.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241204226231605.jpg)
![](http://thumb2018.1010pic.com/images/loading.gif)
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