题目内容
一个内壁光滑的圆柱形气缸,质量为M,底面积为s,缸内有一个质量为m的活塞,封闭了一定质量的理想气体,不计活塞厚度。当温度为t0时,如果用绳子系住活塞将气缸悬挂起来,如图甲所示,气缸内气体柱的高为L1,如果用绳子系住气缸底,将气缸倒过来悬挂起来,如图乙所示,气缸内气体柱的高为L2,设两种情况下气缸都处于竖直状态,求:当时的大气压强。![](http://thumb.1010pic.com/pic2/upload/papers/20140824/2014082415550824014917.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/2014082415550824014917.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241555086141395.png)
试题分析:
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824155508864816.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824155508973758.png)
根据
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824155509066721.png)
即
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241555091761321.png)
解得
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241555086141395.png)
点评:能够把力学中的受力分析和平衡知识运用到理想气体变化的问题中.根据题目找出气体的变化的物理量和不变的物理量.
![](http://thumb2018.1010pic.com/images/loading.gif)
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