a) Let\'s say you have 2 cars and each gets driven the US car average of 15,000

Question

a) Let's say you have 2 cars and each gets driven the US car average of 15,000 miles per year. Each car get 25 mpg. (YMMV, literally.) Calculate your energy use per month for the gasoline used. Use 46.5 kJ/gram as the energy density of gasoline, 3.8 L/gal, and 0.72 g/mL as the density. Give your answer in GJ.

b) What if you switched to 1 car under the same conditions as in the earlier problem OR bought cars with 50 mpg instead of 25? What would your energy use per month for your car be then (also in GJ)?

Explanation / Answer

a) miles driven in 1 month= 1250 miles

Gallon consumption for 2 cars= 2 ( 1250/ 25) = 100 gallons of gasoline used

100 gallons= 440488.37999999995 garms

Energy usage = 46.5 kJ ( 440488.37999999995) = 20482709. 67 kJ =20.4829 GJ apprx

b) energy consuption for 1 car = 10.241 GJ ( half of the 2 cars)

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