Apiston-cylinder arrangement contains air modeled as an ideal gas with constant specific heat ration of k =1.4. the air undergoes a power cycle consisting of four processes in series: process 1 to 2: constant temperature expansion at 600 k from p_1 = 0.5 mpa to p_2 = 0.4 mpa. process 2 to 3: polytrophic expansion with n = k to p_3 = 0.3 mpa process 3 to 4: constant pressure compression to v_4 =v_1 process 4 to 1: constant volume heating. sketch the cycle on a p-v diagram. determine (a) the work and heat transfer of each process in kj/kg and (b) the thermal efficiency.