Problem 5 Warm air is contained in a piston-cylinder assembly oriented horizontally as shown. The air cools slowly from an initial volume of 0.003 m to a final volume of 0.002m. During the process, the spring exerts a force that varies linearly from an initial value of 900 N to a final value of zero. The atmospheric pressure is 100 kPa and the area of the piston face is 0.018m . Friction between the piston and the cylinder wall can be neglected. For the air, determine a) the initial and final pressures b) the work