Air is compressed adiabatically in a piston-cylinder assembly from 1 bar, 300 k to 10 bar, 600 k. consider air as an ideal gas with variable specific heats. determine: a. entropy produced during the process [kj/kg k] b. minimum possible work [kj/kg] required for adiabatic compression between the given initial state and final pressure (clearly justify your result, that it is the minimum possible)