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Thermodynamic Work

by keemosabi
Tags: thermodynamic, work
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keemosabi
#1
Jan19-09, 11:22 AM
P: 109
1. The problem statement, all variables and given/known data
The pressure and volume of a gas are changed along a path ABCA in the figure. The vertical divisions on the graph represent 2.5 multiplied by 105 Pa, and the horizontal divisions represent 1.5 multiplied by 10-3 m3. Determine the work done (including algebraic sign) in each segment of the path.



(c) C to A
J

3. The attempt at a solution
Isn't it just the area under the curve from C to A? Area of a trapezoid? 5625 J?
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Andrew Mason
#2
Jan19-09, 11:25 AM
Sci Advisor
HW Helper
P: 6,684
Quote Quote by keemosabi View Post
3. The attempt at a solution
Isn't it just the area under the curve from C to A? Area of a trapezoid? 5625 J?
Not quite. Is work being done by the gas or on the gas? What does this do to the sign of the area/work?

AM
keemosabi
#3
Jan19-09, 11:30 AM
P: 109
Quote Quote by Andrew Mason View Post
Not quite. Is work being done by the gas or on the gas? What does this do to the sign of the area/work?

AM
Ahh. I see. Since the volume is decreasing the work done by the gas is negative.

Thank you for the help.


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