题目内容
如图所示,一根横截面积S=1
的长管,两端开口,竖直插入水银槽中,有两个质量都是m=20g密闭活塞A、B,在管中封闭两段长都是
=10.0cm的理想气体.开始时A、B都处于静止状态,不计管壁与A、B的摩擦.现在用力F竖直向上缓慢拉动活塞A,当F=4.2N时A、B再次静止.设整个过程中,环境温度不变,g取10m/
,外界大气压强
=1.00×
Pa,水银密度
,求在此过程中:
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241201206641551.gif)
(1)有多高的水银柱进入管内;
(2)活塞A上升的距离.
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120120555969.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120120570951.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120120586936.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120120601952.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120120648961.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241201206641178.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241201206641551.gif)
(1)有多高的水银柱进入管内;
(2)活塞A上升的距离.
(1) 30.9 cm (2)44.7cm
(1)对上部气体:
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241201206792003.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241201206952200.gif)
初状态时管中排开的水银柱高为
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120120711949.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241201207261131.gif)
末状态时进入管中的水银柱高为
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120120757952.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241201207731136.gif)
则进入管中的水银柱的高度为Δh=
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241201207891010.gif)
(2)活塞A上升的高度为:
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241201208201201.gif)
![](http://thumb2018.1010pic.com/images/loading.gif)
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