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Consider a heat engine which does 500 MJ of work over a 3 hour period and...

Consider a heat engine which does 500 MJ of work over a 3 hour period and operates between a hot reservoir of Th = 1250°C and a cold reservoir of Tc = 30.0°C. The engine is ideal and therefore running at its maximum efficiency.

  1. Show that the efficiency is 80.0%?
  2. How much heat:
    1. Comes from the hot reservoir?
    2. Is added to the cold reservoir?
  3. What is the rate of entropy change of the hot reservoir?
  4. Comment, with reasons, on the effect this engine has on the entropy of the surrounding universe.
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