A quantity of air undergoes a thermodynamic cycle consisting of three internally reversible processes in series. Process 1-2: Isothermal compression from p1 = 100 kPa to p2 = 475 kPa Process 2-3: Constant-pressure expansion to T3 = 390k Process 3-1: Adiabatic expansion to the initial state. Employing the ideal gas method, determine (a) The work and heat transfer, each in KJ (b) The entropy change, in KJ/K (c) Its thermal efficiency if the cycle is a power cycle or its coefficient of performance if the cycle is a refrigeration cycle.