题目内容
(9分)如图所示,玻璃管粗细均匀(粗细可忽略不计),竖直管两封闭端内理想气体长分别为上端30cm、下端27cm,中间水银柱长10cm。在竖直管如图位置接一水平玻璃管,右端开口与大气相通,用光滑活塞封闭5cm长水银柱。大气压p0=75cmHg。
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250045210642642.png)
①求活塞上不施加外力时两封闭气体的压强各为多少?
②现用外力缓慢推活塞恰好将水平管中水银全部推入竖直管中,求这时上下两部分气体的长度各为多少?
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250045210642642.png)
①求活塞上不施加外力时两封闭气体的压强各为多少?
②现用外力缓慢推活塞恰好将水平管中水银全部推入竖直管中,求这时上下两部分气体的长度各为多少?
①70cmHg 80 cmHg②
试题分析:上部分气体
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250045210791132.png)
下端封闭气体的压强
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250045210951231.png)
(2)对上端封闭气体,等温变化(设玻璃管横截面积为S)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004521126695.png)
对下端封闭气体,等温变化
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004521142706.png)
且
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004521204813.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004521220750.png)
以上四个方程联立解得:
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004521220643.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004521235645.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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