Air is contained in a vertical cylinder fitted with a frictionless piston and a set of stops as shown in the sketch (distance between the piston and the stops is 0.6 m and distance between the stops and the bottom of the cylinder is also 0.6 m). The cross-sectional area of the piston is 0.05 m^2. The air is initially at 400 C and 0.2 MPa. The air is then cooled by heat flow to the surroundings.
A) Determine the temperature (C) of the air inside when the piston reaches the stops.
B) Determine the final pressure (MPa) if the cooling is continued until the temperature reaches 20 C.