5. A piston/cylinder contains 1.5 kg of air at 300 K and 160 kPa. It is now heated to 900 K. There is a linear spring mounted on the piston such that when the air is heated, the final volume is twice the initial volume. Assume air is an ideal gas with constant specific heat (a) Find the work. (5%) (b) Find the heat transfer. (5%) (c) Plot the process in a P-V diagram. (3%)