题目内容
如图12-1-6所示,在光滑水平面上放一个质量为M、内外壁都光滑的气缸,活塞质量为m,横截面积为S,外界气压为p.现对活塞施以水平恒力F,当活塞与气缸无相对滑动时,气缸内气体压强为多大?
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241205426192373.jpg)
图12-1-6
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241205426192373.jpg)
图12-1-6
p+![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120542635591.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120542635591.gif)
设缸内气体压强为p气,对活塞应用牛顿第二定律pS+F-p气·S="ma " ①
对整体:F=(M+m)a ②
由①②得p气=p+
.
对整体:F=(M+m)a ②
由①②得p气=p+
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120542635591.gif)
![](http://thumb2018.1010pic.com/images/loading.gif)
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