When an automobile moves with constant speed down a highway, mostof the power de

Question

When an automobile moves with constant speed down a highway, mostof the power developed by the engine is used to compensate for themechanical energy loss due to frictional forces exerted on the carby the air and the road. If the power developed by the engine is195 hp, estimate the total friction forceacting on the car when it is moving at a speed of 33 m/s. One horsepower equals 746 W.


I dont particullary want the answer, although that would begood too. I just want to know what equation to use and the stradegyfor solving this problem.

Explanation / Answer

   Power   P   =   Force(F) * velocity (v)    195 hp   =   F* v    195 *746   =   F * 33    Frictionalforce   F   =   195 *746 / 33                                     =   4.408* 103   Newton

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