Question

A car going at 70 miles per hour and consumes 110 HP. The driver is wondering, what fraction of this energy is consumed due to drag forces? The car has

a Cp= 0.28 and a projected area impacted by air of 25 ft2. Assume the air has no velocity in the direction of the car and an air density of 0.08 lbm/ft³. Calculate the power consumed due to drag (in HP) and the fraction of the power consumed by the car that is due to drag. Hint: Power = Force*distance/time (10 pts)

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