Answer: A piston/cylinder assembly containing 2kg of water at 350 kPa and 300C has the piston resting on a set of stops. The mass of the piston and the atmospheric pressure are such that it takes 500 kPa for the piston to start rising. How much heat must be transferred (in kJ) for the piston to start rising? A second set of stops are located 20% higher than the lower stops. How much heat must be transferred (in kJ) for the piston ro reach these stops?
