题目内容
如图,一根长55cm内径均匀的玻璃管竖直静止放置,管的上端封闭下端开口,管内一段长30cm的水银柱将长20cm的空气柱封闭.现让玻璃管匀加速上升,若大气压强为1.0×
,水银的密度为13.6×
,温度保持不变,要使水银不会从管内流出,则运动的加速度不得超过多少?
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241201178091452.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120117715149.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120117731189.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241201178091452.gif)
2.7m/
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/2014082412011782598.gif)
关键是加速运动中气体压强的确定:以汞柱为研究对象,据牛二定律有:p0s-ps-mg=ma.所以p=p0-ρh(g+a).再据玻意耳定律.便可求出a=2.7m/
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/2014082412011782598.gif)
![](http://thumb2018.1010pic.com/images/loading.gif)
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