Question: A heat engine uses a heat source at 560C and has an ideal (Carnot) efficiency of 26 %.To increase the ideal efficiency to 45 %,

  1. A heat engine uses a heat source at 560C and has an ideal (Carnot) efficiency of 26 %.To increase the ideal efficiency to 45 %, what must be the temperature of the heat source?
  2. The exhaust temperature of a heat engine is 250C. What must be the high temperature if the Carnot efficiency is to be 21 %?

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