题目内容
内径均匀的U形管截面积为5
。管右侧上端封闭,左侧上端开口。管内装入适量水银。左侧管内装有光滑的、质量可以不计的活塞。两管中分别封入L=11cm长的空气柱A和B。活塞上下气体压强相等,都是
=76cmHg,这时两管内水银面高度差h=6cm。现在用细绳缓慢地拉活塞向上,使两管中水银面相平,求:
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241200525681502.gif)
(1)活塞向上移动的距离是多少?
(2)应该用多大的力才能使活塞静止在这一位置?(g取10m/
)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120052553121.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120052568105.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241200525681502.gif)
(1)活塞向上移动的距离是多少?
(2)应该用多大的力才能使活塞静止在这一位置?(g取10m/
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/2014082412005258496.gif)
(1)7.2cm (2)14N
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241200525993150.gif)
![](http://thumb2018.1010pic.com/images/loading.gif)
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