Here is a cylinder with a piston and electrical heat. the cylinder is insulated.

atmospheric pressure = 1 bar

mass of piston = 45kg

Area of piston = 0.09 m^2

mass of air = 0.27kg

(air) The amount of change in volume is 0.045m^3 where the amount of change in internal energy is 42kJ/kg.

How much is work in this system?(Calculate the work at a and b respectively)

a) Suppose that system has air only. (W = ??)

b) Suppose that system has air and piston. ( W = ??)

piston 11 WMN + lair celedrical heat) insulated