(Solved): can you explain the answer step by step with extra details please? 2) (50 pts) Air is contained ...

can you explain the answer step by step with extra details please?

2) (50 pts) Air is contained in a vertical piston-cylinder assembly fitted with an electrical resistor. The atmosphere exerts a pressure of 1 bar on the top of the piston, which has a mass of $45\mathrm{kg}$ and area of $0,09{\mathrm{m}}^2$. Electric current passes through the resistor, and the volume of the air slowly increases by $0,045{\mathrm{m}}^3$ while its pressure remains constant. The mass of the air is $0,27\mathrm{kg}$, and its specific internal energy increases by $42\mathrm{kJ}/\mathrm{kg}$. The air and piston are at rest initially and finally. The piston-cylinder system is well insulated. Friction between the piston and cylinder wall can be ignored, and the local acceleration of gravity is $\mathrm{g}=9,81\mathrm{m}/{\mathrm{s}}^2$, Determine the electrical work performed by the resistor, in $\mathrm{kJ}$. (See figure 2)