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![[Post New]](/templates/default/images/icon_minipost_new.gif) 22 Mar 2008 21:36:20 IST
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if for an ideal gas in a process P=kV (k=const.) then prove that C = Cv + R/2 i am really stuck at this!! pls help !!!
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Umang |
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22 Mar 2008 22:04:17 IST
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P=kV PV-1=K so now n=-1 now C=Cv+ R/(1-n) for polytropic process C=Cv+R/2
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22 Mar 2008 22:13:50 IST
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can u pls derive that formula ??? i am stuck at that formula !!! i cant derive it !!!
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Umang |
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22 Mar 2008 22:36:15 IST
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22 Mar 2008 22:47:40 IST
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no need 4 all this...
just remember...specific heat
C= Cv + (P/n)dV/dT *
where P=pressure, n= no. of moles of gas,
dV/dT can be found 4rm the relation P=KV....substitute value of P wid nRT/V and find dV/dT...
put it in *...and there u get ur answer.....
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22 Mar 2008 23:04:53 IST
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Will nip in at times to solve problems :)
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22 Mar 2008 23:16:32 IST
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Please ask if you have doubts
edit - I am dividing throughout by ndT, and not nT 
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Will nip in at times to solve problems :)
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22 Mar 2008 23:30:03 IST
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Always go from first principles for such problems, you'll never go wrong
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Will nip in at times to solve problems :)
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23 Mar 2008 00:10:33 IST
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this might help
http://www.goiit.com/posts/list/heat-thermodynamics-molar-capacity-43950.htm#217049
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Impossible To be Impossible is Impossible |
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23 Mar 2008 20:47:44 IST
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hey guys ! thanks for answering ! doubt cleared !!!
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Umang |
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