When it is burned, 1 gallon of gasoline produces 1.3 times 10^8 J of energy. 160

Question

When it is burned, 1 gallon of gasoline produces 1.3 times 10^8 J of energy. 1600 kg car accelerates from rest to 39 m/s in 10 s. The engine of this car is only 15 % efficient (which is typical), meaning that only 15% of the energy from the combustion of the gasoline is used to accelerate the car. The rest goes into things like the internal kinetic energy of the engine parts as well as heating of the exhaust air and engine. Part A How many gallons of gasoline does this car use during the acceleration? Part B How many such accelerations will it take to burn up 1 gallon of gas?

Explanation / Answer

Gallons used effectively for acceleratio of car = 1 gallons ( 15 %) = 0.15 gallon

No. of acceleration which will consume entire 1 gallon = 1/ 0,.15 = 6.66 acclerations apprx

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