A proposed heat engine operates between a single thermal reservoir and the surroundings as follows:
• It absorbs 200J of thermal energy from a large reservoir whose temperature remains fixed at 300K.
• It delivers 200J of mechanical work to the environment.
• It exhausts no thermal energy to any other reservoir.
(a) Calculate the change in entropy of the 300K reservoir during one complete cycle of the engine.
(b) State the entropy change of the working substance of the engine over one complete cycle and justify your answer briefly.
(c) Determine the total entropy change of the universe (engine plus everything else) for one cycle.
(d) Using your result from part (c), assess whether the proposed engine is feasible. Support your conclusion with clear reasoning based on thermodynamic principles.