A vertical piston-cylinder arrangement contains air at 27 C and is equipped with an electric resistor. The top of the piston experiences a pressure due to the atmosphere (Patm-100 kPa). While the pressure of the air stays constant, an electric current passes through the resistor, resulting in a gradual increase in the air's volume from initial 1m to 1.2 m3. The air specific internal energy increases by 20 kJ/kg. Determine the heat transfer from the resistor to the air in kJ for the system consisting of the air shown in the figure. The piston has a mass of 25 kg and a surface area of 1 mf. System boundary Air Piston Patm 100 kPa mpiston = Apiston = 1 m 25 kg 0000000 +