题目内容
如图所示,水平放置的汽缸内壁光滑,活塞厚度不计,在A、B两处设有限制装置,使活塞只能在A、B之间运动,B左面汽缸的容积为V0,A、B之间的容积为0.1V0。开始时活塞在A处,缸内气体的压强为1.1p0(p0为大气压强且保持不变),温度为399.3K,现缓慢让汽缸内气体降温,直至297K。求:![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241710459137630.jpg)
(1)活塞刚离开A处时的温度TA;
(2)缸内气体最后的压强p;
(3)在右图中画出整个过程的p-V图线。
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241710459137630.jpg)
(1)活塞刚离开A处时的温度TA;
(2)缸内气体最后的压强p;
(3)在右图中画出整个过程的p-V图线。
(1)
(2)
(3)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241710472864609.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824171046288638.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824171046896522.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241710472864609.jpg)
试题分析:等容过程中活塞离开A时的温度为TA
(1)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824171047504593.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824171047879840.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824171046288638.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824171049033666.png)
(2)等压过程中活塞到达B处时的温度为TB
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824171049579766.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824171050110839.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824171050624614.png)
等容降温过程
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824171046896522.png)
(3)如图
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241710512954618.jpg)
点评:本题关键在于分析气体发生何种状态变化,考查分析判断的能力.审题时,要充分挖掘隐含的条件.这是高考命题立意的热点.
![](http://thumb2018.1010pic.com/images/loading.gif)
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