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![[Post New]](/templates/default/images/icon_minipost_new.gif) 8 Mar 2008 00:12:31 IST
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8 Mar 2008 00:21:02 IST
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in the first question the ratio should be  Q/ U right? instead of V?
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"I a universe of atoms.......an atom in the universe" |
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8 Mar 2008 00:33:30 IST
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edited
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Will nip in at times to solve problems :)
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8 Mar 2008 00:38:17 IST
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no this question is given in MTG:Physics for You:Feb?08
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8 Mar 2008 00:39:53 IST
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Is my ans wrong?
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Will nip in at times to solve problems :)
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8 Mar 2008 00:40:00 IST
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PAGE NO: 27
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8 Mar 2008 00:41:30 IST
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YES........Ans is b for 2 question Ans for 1 is c
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8 Mar 2008 00:45:05 IST
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I am quite sure of my answer for the second one. Don't see how the answer is b)
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Will nip in at times to solve problems :)
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8 Mar 2008 07:53:25 IST
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2)
st line eqn
P = mT + c
P= mPV/nR + c
nRP =mPV + nRc
P=nRc/ (nR - mV)
W = integ PdV
= integ [nRc/ (nR - mV) *dV]
= -nRc/m ln (nR-mV) from 0 to V
= nRc/m * ln nR / (nR - mV)
if my steps are correct then look further--
since
nR >nR-mV
hence nR / (nR - mV) >1 or ln of that is +tive
also
nRc/m is +tive
hence work done is positve
thus
volume increases as we move from A to B
i hope it is correct
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Impossible To be Impossible is Impossible |
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8 Mar 2008 11:32:15 IST
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Mistake, rather, grave mistake made by me was I took P/T to be constant, though that is not the case here. It would be true if the line passed through the origin.
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Will nip in at times to solve problems :)
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13 Mar 2008 14:00:09 IST
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amazing..
if ans to 1) is c.. then dQ/dV = 1..???
as dQ/dW..is itself coming out to be..c..
if it is dQ/dU..then ans is y-1 itself..
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Diamonds r formed under greatest pressures..
so r the champs.
Kriteesh..
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15 Mar 2008 09:05:55 IST
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Kishore first of all, i would like to tell you that in this forum yopu can ask only one question in a post.
The first question posted by you is wrong as deltaQ/deltaV is dimensional and dltaQ/deltaW is not. So there ratio can never be non dimensional.
In general for a isobaric process
deltaQ = nCpdT
deltaU = nCvdT
and delta W = n(Cp-Cv)dT
So if it is ratio of dltaQ/deltaU and dltaQ/deltaW then answer is Cv/(Cp-Cv)
= 1/(gamma-1) which is not an option over here.
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Krishna Gopal Singh
B.Tech Chemical Engg
IIT Delhi 2002
Currently doing PhD from IIT Delhi |
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15 Mar 2008 13:29:54 IST
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yes..i agree..sir.. i was getting the same..
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Diamonds r formed under greatest pressures..
so r the champs.
Kriteesh..
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