As a gasoline engine is running, an amount of gasoline containing 13,600 J of chemical potential energy is burned in 1 s. During that second, the engine does 3,400 J of work.

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

(b)The burning gasoline has a temperature of about 4,100F (2,500 K). The waste heat from the engine flows into air at about 90F (305 K). What is the Carnot efficiency (in percent) of a heat engine operating between these two temperatures?