题目内容
(9分)如图所示,上端开口的光滑圆柱形汽缸竖直放置,截面积为40cm2的活塞将一定质量的气体和一形状不规则的固体A封闭在汽缸内.在汽缸内距缸底60cm处设有a、b两限制装置,使活塞只能向上滑动.开始时活塞搁在a、b上,缸内气体的压强为
(
=1.0×105Pa为大气压强),温度为300K.现缓慢加热汽缸内气体,当温度为330K,活塞恰好离开a、b;当温度为
360K时,活塞上升了4cm.
.求:
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250043111311127.png)
①活塞的质量;
②物体A的体积.
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004311084353.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004311084353.png)
360K时,活塞上升了4cm.
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004311115624.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250043111311127.png)
①活塞的质量;
②物体A的体积.
(1)4kg;(2)640cm3
试题分析:(1)物体A的体积为ΔV.
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004311147294.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004311162330.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004311178357.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004311193325.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004311209349.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004311225723.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004311240377.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004311178357.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004311271338.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004311287365.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004311209349.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004311318381.png)
由状态1到状态2为等容过程:
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004311334608.png)
代入数据得:m=4kg (2分)
(2)由状态2到状态3为等压过程:
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004311349618.png)
代入数据得:ΔV=640cm3 (2分)
![](http://thumb2018.1010pic.com/images/loading.gif)
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