Question
(a) A cyclical heat engine, operating between temperatures of $450^\circ\textrm{C}$ and $150^\circ\textrm{C}$ produces 4.00 MJ of work on a heat transfer of 5.00 MJ into the engine. How much heat transfer occurs to the environment? (b) What is unreasonable about the engine? (c) Which premise is unreasonable?
1. $1.00 \times 10^6 \textrm{ J}$
2. The efficiency of 0.80 is greater than the Carnot efficiency of 0.41. This is not possible.
3. Either less work was done, or more heat was input.
Solution Video