A vertical cylinder fitted with a frictionless piston initially contains air at 0.45 MPa and 380 C. As shown in the figure below, the piston is held by the stops so that the piston does not move up. The piston has a mass of 16 kg and diameter of 7 cm. The atmospheric pressure is 100 kPa. The cylinder now cools as heat is transferred to the surroundings. Air 50 cm a) What is the temperature when the piston starts moving down? b) Assume that the stops are removed at the beginning of the cooling process. What would be the final height of the piston when the temperature is decreased to 20 C