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

Question

Quizplus · Accepted Answer

The work done against the drag force is equal to the energy content of the fuel. With 40 MJ/L and a drag force of 1000 N, the distance is 40,000,000 J / 1000 N = 40,000 meters, or 40 km.

Suppose a Miracle Car Has a 100 Percent Efficient Engine