Question

As a gasoline engine is running, an amount of gasoline containing 18,500 J of chemical potential energy is burned in 1 s. During that second, the engine does 3,700 J of work.

(a) What is the engine’s efficiency (in percent)?

(b) The burning gasoline has a temperature of about 4,400°F (2,700 K). The waste heat from the engine flows into air at about 84°F (302 K). What is the Carnot efficiency (in percent) of a heat engine operating between these two temperatures?

 

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