An engine manufacturer makes the claim that the engine they have developed will,

Question

An engine manufacturer makes the claim that the engine they have developed will, on each cycle, take 100 J of heat out or boiling water at 100 degreeC, do mechanical work of 80 J, and exhaust 20 J of heat at 10 degreeC. What, it anything, is wrong with this claim? A) There is nothing wrong with this claim because 100 J = 20 J + 80 J. B) This engine violates the first law of thermodynamic because 100 J + 80 J. C) An engine would operate by taking in heat at the lower temperature and exhausting heat at the higher temperature. D) The heat exhausted must always be greater than the work done according to the second law of thermodynamics. E) The efficiency of this engine is greater than the ideal Carnot cycle efficiency.

Explanation / Answer

there is nothing wrong with this claim because the heat supplied = heat rejected +work done

100 = 80+20 J

so option A) is the correct answer

rest all options are incorrect

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