Thermodynamics: P,V,T graphs and other misc. questions.by fractal01 Tags: graphs, misc, thermodynamics 

#1
Aug1411, 11:34 AM

P: 14

Basically I found your tips on things that you need to include when solving the question really helpful, and I was wondering, should you sketch graphs of specific volume against pressure, temperature, etc, or should you just use regular volume, or both? And I was wondering, how do you identify a isentropic problem? 



#2
Aug1411, 12:08 PM

P: 16

An isentropic problem can be identified in a couple ways: 1) they tell you it's isentropic 2) they tell you its reversible AND adiabatic (need both!) 3) they tell you it's an ideal gas with n=k. 



#3
Aug1411, 07:23 PM

P: 14

Also, I've been trying to work out how you would see that, in the last part of all of the questions the value would always be positive and I got to the point where it must be that (T1+T2)/2 > sqrt(T1 T2). I think that there must be some mathematical proof that you should be able to use to prove that this is true, but I've been trying for hours now and I can't think of what it would be. Any ideas appreciated!! 



#4
Aug1411, 07:30 PM

P: 14

Thermodynamics: P,V,T graphs and other misc. questions. 



#5
Aug1411, 11:23 PM

P: 16





#6
Aug1511, 08:05 PM

Mentor
P: 11,985

Moderator's note  the above posts have been moved here from a previous (and unrelated) thread:
http://www.physicsforums.com/showthread.php?t=520307 


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