- #1

- 933

- 56

## Homework Statement

## Homework Equations

no

## The Attempt at a Solution

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I assumed the path from c to a to be a straight line and I'm unable to find the work as the area in the image above. (sorry my poor english).

The book's answer is -2460 J. The answer I found is ≅ -1112 J.

My calculations:

V

_{a}/ T

_{a}= V

_{b}/ T

_{b}

V

_{b}= 3 V

_{a}/ 2

P = n R T

_{a}/ V

_{a}

ΔU

_{from a to c}= -800J - P V

_{a}/ 2 = n (3/2) R (T

_{c}- 200K)

T

_{c}= 101.26K

Here is the problem. The area in the graph above should be the work done, and it would be equal to (P

_{a}+ P

_{c}) (V

_{a}-

**V**) / 2

_{b}I've used V

_{b}because V

_{c}is equal to it. But solving this expression I cant find the answer of the book.

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