Question

Water is being heated in a closed pan on top of a range cooker while being stirred by a paddle wheel. During the process, 46 kJ of heat is transferred to the water, and 2 kJ of heat is lost to the surrounding air. The paddle-wheel work in to the water amounts to 780 N - m.By applying an energy balance determine the final internal energy of the system (in kJ) if its initial internal energy is 17 kJ to 1 decimal place.

Fig: 1