4. A piston-cylinder arrangement initially contains air at 250 kPa, 320 °C and with a volume of 33 L; at this point the piston pushes against the stops. 200 kPa is required to float the piston. The air is now cooled to 40 °C. Determine the final volume, work done, and heat transferred. DATA for air: R=0.287 kPa-m³/kg-K, Cvo=0.718 kJ/kg-K. ait