Problem 2 A new heat engine cycle can be described by an adiabatic compression (a + 6), an isothermal expansion (6 + e), and an isochoric cooling process (e - a), as shown in the graph. The compression ratio is r. For a diatomic ideal gas: cy = R, cp = 3R. 7 = 14 Assume the processes are reversible. If point a is at room temperature (300K) and atmospheric pressure (100kPa), and the compression ratio is 4. what is the efficiency for this heat engine? Searth = P planet = P 4. ret P= Searth . Rez Splanet = Searth Pressure Splennet = 1. 4 w/m] J = P Vo Volume