A Carnot cycle, shown in Fig. 20-7, has the following conditions: Va = 7.5 L, Vb = 15 L, TH = 470°C, and TL = 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...)
PVy = Constant
The Attempt at a Solution
I already solved part (a), with Pa = 4.1 x 105 Pa and Pb = 2.1 x 105 Pa.
For part (b), I tried
PVy = constant
nRT⋅Vy-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 Vc = 34 L and Vd = 17 L.