HW-6(ii) A gas (m = 5 kg) is contained in a closed, rigid tank. A stirrer and an electric resistor inside the tank are switched on for a period of 10 minutes. The stirrer rotates at 10 rpm with a torque of 10 N-m while 5 A of current flows through the electric resistor across a voltage difference of 1.5 V. The specific internal energy of the gas increases by 3 kJ/kg during this period. Calculate the heat transfer during the process, in kJ.