Thermal Physics question
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Thermal Physics question

[From: ] [author: ] [Date: 12-11-01] [Hit: ]
A.B.C.D.E.Can you show all working if possible?......
An ideal gas is compressed by cooling it at a constant pressure of 300kPa from an initial volume of 6.00m3 (State A) to 0.20m3 (State B). The gas is then heated at constant volume. The pressure increases until the gas reaches State C in which the temperature has its original value (same temperature as State A). How much work is done by the gas on the surroundings from State A to State C?

A. -170MJ
B. +180MJ
C. -180MJ
D. +240MJ
E. -170MJ

Can you show all working if possible? Thanks for the help

-
300kPa = 300000Pa
From State A to B..
Its constant pressure process..
So
W = p(V2 - V1) = 300000(0.2 - 6.00) = -1740000J...= -1.74MJ...

The second one is Constant volume Process So
W = p(delta V) Since volume does not change there is no work done...
So
W = 0 in B -> C...

Total work = Wab + Wbc = -1.74 MJ..

Is it 300kPa?There is some mistakes in the given values? Or in my calculation :[
1
keywords: Thermal,question,Physics,Thermal Physics question
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