Avertical piston-cylinder device contains nitrogen gas at 2 bar and 0.3 m3 . at this state, a linear spring with a spring constant of 100 kn/m touches the top of the piston but exerts no force on it. the cross-sectional area of the piston is 0.1 m2 . the nitrogen gas is then heated, pushing the piston upwards against the spring, and expands until the volume of the gas doubles show the process on a p-v diagram. b. a determine final pressure (kpa) of the nitrogen gas what is the total work done (kj) during the expansion process? d. what fraction of the total work is done against the spring?