Questions
When an automobile moves with constant speed down a highway, most of the power developed by the engine is used to compensate for the energy transformations due to friction forces exerted on the car by the air and the road. If the power developed by an engine is 175 hp, estimate the total friction force (approx.) acting on the car when it is moving at a speed of 25 m/s. One horsepower equals 746 W.
detailed solution
Correct option is D
When the car moves at constant speed on a level roadway, the power used to overcome the total friction force equals the power input from the engine, or Poutput = ftotalv = Pinput. This givesftotal = Pinputv = 175 hp25 m/s(746 W1 hp) = 5.22 × 105 N or about 5 ×105N or 500 kN(aprrox.)Talk to our academic expert!
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