5. [-/2 Points] DETAILS OBINPHYS8 5.P.029. MY NOTES ASK YOUR TEACHER PRACTICE ANOTH As a gasoline engine is running, an amount of gasoline containing 15,500 J of chemical potential energy is burned in 1 s. During that second, the engine does 3,100 j of work. (a) What is the engine's efficiency (in percent)? % (b) The burning gasoline has a temperature of about 4,200F (2,600 K). The waste heat from the engine flows into air at about 820F (301 K). What is the Carnot efficiency (in percent) of a heat engine operating between these two temperatures? % Need Help? Read It