题目内容
如图,有一长为L、右端带有卡口的内壁光滑圆柱形气缸,一个质量不计的5火花塞封闭一定质量的理想气体.开始时活塞处在离气缸左端
处,气体温度微27℃,现对气体缓慢加热.
求:当加热到427℃时,气体的压强(已知外界大气压恒为ρ0 )
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250046333852787.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004633370464.png)
求:当加热到427℃时,气体的压强(已知外界大气压恒为ρ0 )
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250046333852787.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004633416649.png)
试题分析:开始加热活塞移动的过程中封闭气体作等压变化。设气缸横截面积为S,活塞恰移动到气缸右端开口处时,气体温度为t ℃,则对于封闭气体
状态一:T1=(27+273) K,
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004633432677.png)
状态二:T=(t+273) K,V=LS (1分)
由
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004633448553.png)
解得:t=177 ℃ (1分)
说明当加热到427 ℃时气体的压强变为p3,在此之前活塞已移动到气缸右端开口处,对于封闭气体
状态一:T1=300 K,
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004633432677.png)
状态三:T3=700 K,V3=LS, (1分)
由
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004633479779.png)
解得:
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004633416649.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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