An air-standard cycle with variable specific heats is executed in a closed system and is composed of the following four processes: 1-2 Isentropic compression from 100 kPa and 22degree C to 600 kPa 2-3^v = constant heat addition to 1500 K 3-4 Isentropic expansion to 100 kPa 4-1 P = constant heat rejection to initial state (a) Show the cycle on P-^v and T-s diagrams. (b) Calculate the net work output per unit mass. (c) Determine the thermal efficiency