An ideal gas undergoes two processes in a piston-cylinder device as follows:
1–2 - Polytropic compression from 71, and P, with a polytropic exponent n and a compression ratio of r = V1/V2.
2–3 Constant pressure expansion at P3 = P2until V3=V1.
(a) Sketch the processes on a single P-Vdiagram.
(b) Obtain an expression for the ratio of the compression-to-expansion work as a function of nand r.
(c) Find the value of this ratio for values of n= 1.4 and r =6.
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