8. (10 points) A rigid tank, filled partly with water, is heated by a burner as illustrated in the figure (right). During this process, the system is being stirred by

a paddle wheel. The initial internal energy of water was 1,000 kJ. The mechanical work transferred into the water by the paddle during the heating process is 200 kJ, the heat loss to the surroundings is 500 kJ, and the heat transfer from the burner to the water is 1,500 kJ. (a) (2p) Please list the forms of energy transfer involved in the process. (b) (2p) Is this a closed system or a control volume system? Explain. (c) (3p) Please write down the First Law of Thermodynamics for this system. (d) (3p) Please calculate the final internal energy of water.