An ideal gas undergoes the cycle shown in the figure below: it expands isobarically at pressure p from volume V to volume XV, cools isometrically, and then returns isothermally to its initial state. isothermal V AV a) Derive the following expressions for the heat flowing in or out of the system in terms of , p and V. 1-2 212 = p HPV(X - 1) 2-3 Q23 = # PV (1 - X) 3-1 Q31 = -pV log A b) Hence derive that the efficiency is e = 1 - log A A