engineering Thermodynamics please show work and complete parts a, b and c

4. A piston-cylinder assembly contains air modeled as an ideal gas with a constant specific heat ratio, k=1.4. The air undergoes a power cycle consisting of four processes in series: Process 1-2: Constant-temperature expansion at 600K from p1=0.5MPa to p2=0.4 MPa. Process 2-3: Polytropic expansion with n=k to p3=0.3MPa Process 3-4: Constant-pressure compression to V4=V1. Process 4-1: Constant-volume heating. a. Sketch the cycle on a p-v diagram. b. Determine the work band heat transfer for each process, in kJ/kg, and c. Determine the thermal efficiency