air undergoes three processes in series:
Process 1-2: polytropic compression, with n=1.3, from p1=100 kPa, v1=.04 m^3/kg to v2=.02 m^3/kg
Process 2-3: isobaric process to v3=v1
Process 3-4: isometric process to p4=350 kPa
Sketch the process on a p-v diagram and determine the net work per unit mass of the air.
If you can give a DETAILED answer for one out of two of these, I will give you the points.