Suppose a miracle car has a 100% efficient engine and burns fuel that has a 40-megajoules-per-liter energy content.If the air drag and overall frictional forces on this car traveling at highway speeds total 1000 N,what is the overall limit in distance per liter it could be driven on the highway?

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Quizplus · Accepted Answer

The energy content of the fuel is 40 megajoules per liter. With a 100% efficient engine, all this energy can be used to overcome the 1000 N drag force. The work done is force times distance, so 40,000,000 J = 1000 N * distance. Solving for distance gives 40,000 meters, or 40 km.

Suppose a Miracle Car Has a 100% Efficient Engine and Burns