Air in a piston-cylinder assembly, initially at 290 K and 100 kPa, undergoes two internally reversible processes in series.
Process 1-2: Polytropic compression (n = 1.19) to pressure P2 = 500 kPa.
Process 2-3: Adiabatic expansion back to initial pressure of 100 kPa.
(a) Sketch the two processes in series on a T-s diagram.
(b) Determine the temperature at state 2 (K).
(c) Determine the net specific work (kJ/kg) for the overall Process 1-2-3.