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Power of Elevator

  1. Oct 25, 2008 #1
    1. The problem statement, all variables and given/known data
    An elevator has a mass of 956 kg and car-
    ries a maximum load of 764 kg. A constant
    frictional force of 4150 N retards its motion
    The acceleration of gravity is 9.8 m/s2 .
    What power must the motor deliver at a
    instantaneous speed of 4.69m/s if the elevator
    is designed to provide an upward acceleration
    of 1.07 m/s2? Answer in units of W.

    3. The attempt at a solution

    F=N-frictional force

    I was wondering if this progression of the problem would be logical to solve for the power.
    Last edited: Oct 25, 2008
  2. jcsd
  3. Oct 25, 2008 #2
    I got it:

    N=(me+ml)(g+a) + friction

    P= Nv

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