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3. a) What is the maximum efficiency of a heat engine that operates between a high thermal reservoir at 500°C and a low thermal reservoir at 10°C? [5 marks] b) Consider a heat engine operating between a high thermal reservoir at 500°C and a low thermal reservoir at 10°C, and producing 325 kW of work while rejecting 200 kW of waste heat to the low thermal reservoir. What is the second law efficiency of this heat engine? I [5 marks) c) In a condenser, saturated water vapour flows through cool water pipes, condenses on the surface of the cooling pipes and leaves the condenser as saturated liquid. Cooling water enters the 4-cm-diameter thin copper tubes at an average velocity of 3m/s and at 10°C, and leaves the condenser at 25°C. Saturated vapour at the inlet is at 80°C. What is the mass flow rate of the saturated vapour? [10 marks] steam Water 3 m/s ooooooo