Answer:
0.833 m³/kg
-14.4 kJ
20 kJ/kg
Step-by-step explanation:
= Density = 1.2 kg/m³
= Volume = 0.6 m³
t = Time taken = 1 hour
P = Power = 4 W
Mass is given by

As there is no change in kinetic and potential energy, the specific volume of the tank will be unaffected

The specific volume at the final state is 0.833 m³/kg
Energy is given by

The energy transfer by work is -14.4 kJ
Change in specific internal energy is given by

The change in specific internal energy is 20 kJ/kg