题目内容
如图所示,透热的气缸内封有一定质量的理想气体,缸体质量M=200kg,活塞质量m=10kg,活塞面积S=100cm2。活塞与气缸壁无摩擦且不漏气。此时,缸内气体的温度为27°C,活塞正位于气缸正中,整个装置都静止。已知大气压恒为p0=1.0×105Pa,重力加速度为g=10m/s2。求:
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241338140762385.png)
(a)缸内气体的压强p1;
(b)缸内气体的温度升高到多少°C时,活塞恰好会静止在气缸缸口 AB处?
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241338140762385.png)
(a)缸内气体的压强p1;
(b)缸内气体的温度升高到多少°C时,活塞恰好会静止在气缸缸口 AB处?
(a)
(b)327℃
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824133814108706.png)
(a)以气缸为对象(不包括活塞)列气缸受力平衡方程:
(3分)
解之得:
(1分)
(b)当活塞恰好静止在气缸缸口AB处时,缸内气体温度为
,压强为![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824133814248368.png)
此时仍有
,即缸内气体为等压变化。
对这一过程研究缸内气体,由状态方程得:
(3分)
所以
(1分)
故
℃=327℃ (1分)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824133814139805.png)
解之得:
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824133814108706.png)
(b)当活塞恰好静止在气缸缸口AB处时,缸内气体温度为
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824133814217364.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824133814248368.png)
此时仍有
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824133814295804.png)
对这一过程研究缸内气体,由状态方程得:
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824133814326881.png)
所以
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824133814357712.png)
故
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824133814420752.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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