Problem 4: A gas of mass 1.5 kg undergoes a quasi-static expansion which follows a relationship p = a + bV, where a and b are constants. The initial and final pressures are 1000 kPa and 200 kPa respectively and the corresponding volumes are 0.20 m3 and 1.20 m3. The specific internal energy of the gas is given by the relation u = 1.5 pv 85 kJ/kg Where p is the kPa and v is in m3/kg. Calculate the net heat transfer and the maximum internal energy of the gas attained during expansion. (Ans. 660 kJ, 503.3 kJ)