Work Done on Thermodynamic Path ABCA: 5625 J

[keemosabi]

Homework Statement

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

The Attempt at a Solution

Isn't it just the area under the curve from C to A? Area of a trapezoid? 5625 J?

 

[Andrew Mason]

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]

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.