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Homework Help: Power, Work, and an Inclined Angle HELP ME

  1. Oct 28, 2008 #1
    Power, Work, and an Inclined Angle...HELP ME!!!

    1. The problem statement, all variables and given/known data

    A car with a mass of 1900 kg is going up a hill at a constant velocity of 27 meters/second. Later, the same car (mass: 1900 kg) is going down the same hill at a constant velocity of 27 meters/second. The frictional force and air resistence are the same going up the hill and going down the hill. The angle of the hill (inclined) is unknown. The horsepower of the car when it goes down hill is 47 horsepower more than the power going uphill. WHAT IS THE DEGREE OF THE HILL'S ANGLE?

    2. Relevant equations

    Power = K, so mgh = 1/2mv^2

    W = Fdcos*angle*

    Power = Work/time = force(velocity)

    3. The attempt at a solution

    The farthest I got was making two free-body diagrams -- one of the car going uphill and one of the car coming downhill.
  2. jcsd
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