Problem 2 - Mechanical Work This may seem like an abstract "Physics-like" problem – but we are developing skills for later. A 300 kg piston rests on some stops (ledges) just above a quantity of air which is contained in a 200 mm diameter cylinder. At this initial state, the spring is neither stretched nor compressed. After a while, a certain amount of heat is added to the air in the cylinder and the piston rises 50 mm in response. 400 kN/m 300 kg Frictionless piston Air 150 mm 200 mm A. Draw a free body diagram of the piston (only). Identify and label all of the forces acting on the piston. B. Determine the work done on the piston in raising it 50 mm. C. Determine the energy change of the piston in this process. D. Is the energy change of the piston equal to, less than or greater than the heat added to the air in the cylinder? Explain your answer.