In a piston cylinder assembly 20kj of boundary work is being done on the piston assuming there is heatloss to the surroundings and that change in internal energy is 6 kj what is the amount of heat loss in kj additionally if the cylinder has a diameter of 40 cm determine the axial displacement of the piston the pressure inside the piston is a constant 200kpa and the change in internal energy for the process is plus 12kj

A2-m rigid tank initially contains saturated water vapor at 100 kpa. the tank is connected to a supply line through a valve. steam is flowing in the supply line at 600 kpa and 300 c. the valve is opened, and steam is allowed to enter the tank until the pressure in the tank reaches the line pressure, at which point the valve is closed. a thermometer placed in the tank indicates that the temperature at the final state is 200°c. determine (a) the mass of steam that has entered the tank (b) the amount of heat transfer.