A reversible heat engine operates between a hot reservoir at temperature TH=500K and a cold reservoir at TC=300K. During each cycle the engine absorbs QH=2000J of heat from the hot reservoir.
(i) Calculate the heat QC rejected to the cold reservoir and the work W obtained per cycle.
(ii) Find the entropy change of the working substance for each of the four processes that make up the Carnot cycle and hence obtain the total entropy change of the substance for one complete cycle.
(iii) Determine the entropy change of the two reservoirs taken together.
(iv) Using your results, state the value of the total entropy change of the universe for the cycle and comment on its significance.