As a gasoline engine is running, an amount of gasoline containing 9,600 J of chemical potential energy is burned in 1 s. During that second, the engine does 3,200 J of work. (a) What is the engine's efficiency (in percent)? % (b) The burning gasoline has a temperature of about 4,900OF (3,000 K). The waste heat from the engine flows into air at about 820F (301 K). What is the Carnot efficiency (in of a heat engine operating between these two temperatures? %