Task: 1. In a closed system, 100 kJ/kg of thermal energy is transferred to the system and 60 kJ/kg of work done by the system. Determine the change in the internal energy of the system if the mass of the system is 4 kg. 2. A fixed amount of water is enclosed in a cylinder and piston assembly. The mass of the water is 10 kg. The initial internal energy of water is: u = 1600 kJ/kg The water is heated. After the heating process, the internal energy of water is as follows: u2=3200 kJ/kg If the amount of work involved in the process is +3000 kJ, determine the heat transfer (in kJ) during the process along with it sign (+/-).