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## Homework Statement

A Carnot cycle, shown in Fig. 20-7, has the following conditions: V

_{a}= 7.5 L, V

_{b}= 15 L, T

_{H}= 470°C, and T

_{L}= 260°C. The gas used in the cycle is 0.50 mil of a diatomic gas, y = 1.4. Calculate (a) the pressures at a and b; (b) the volumes at c and d.

*(The rest of the problem...)*

## Homework Equations

PV

^{y}= Constant

## The Attempt at a Solution

I already solved part (a), with P

_{a}= 4.1 x 10

^{5}Pa and P

_{b}= 2.1 x 10

^{5}Pa.

For part (b), I tried

PV

^{y}= constant

nRT⋅V

^{y-1}= constant.

Annnnd then I get lost. I don't understand what constant represents or if I am even on the right track. The book says V

_{c}= 34 L and V

_{d}= 17 L.