2. A piston/cylinder arrangement contains air at 250 kPa and 300 °C. The piston, which initially pushes against the upper stops, weighs 50 kg and has a diameter of 0.1 m. The cylinder then cools as heat is transferred to the ambient, which is at 100 kPa and 20 °C. a. At what temperature does the piston begin to move down? (4 points) b. How far has the piston dropped when the temperature reaches ambient? (4 points) Po Air