Two kilograms of air within a piston-cylinder assembly execute a Carnot power cycle within maximum and minimum temperature of 750 K and 300 K, respectively. The heat transfer to the air during the isothermal expansion is 60 kJ. At the end of the isothermal expansion the volume is 0.4 m3 . Assuming the ideal gas model for the air, determine (a) the thermal efficiency. (b) the pressure (in kPa) and volume (in m3 ) at the beginning of the isothermal expansion. (c) the work and heat transfer for each of the four processes (in kJ). (d) Sketch the cycle on p-V coordinates