Physics

posted by Kevin Fung

The maximum torque output from the engine of a new experimental car of mass m is τ. The maximum rotational speed of the engine is ω. The engine is designed to provide a constant power output P. The engine is connected to the wheels via a perfect transmission that can smoothly trade torque for speed with no power loss. The wheels have a radius R, and the coefficient of static friction between the wheels and the road is µ.
What is the maximum sustained speed v the car can drive up a 30 degree incline? Assume no frictional losses and assume µ is large enough so that the tires do not slip.

  1. Damon

    Normal force = m g cos 30
    max friction force = mu m g cos 30

    power in = power out
    P = (mu m g cos 30) v

  2. NotDamon

    It says that mu is large enough that the tires don't slip
    the answer is v = 2P/mg
    of why there is not root(3) in the denominator i am not sure but that is what the USAPho test solution says.

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