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Homework Help: Work on a system with friction

  1. Nov 22, 2007 #1
    1. The problem statement, all variables and given/known data

    a. How much work must you do to push a 10 kg block of steel across a steel table at a steady speed of 1.0 m/s for 3 s? The coefficient of kinetic friction for steel on steel is 0.60.

    b. What is your power output while doing so?

    2. Relevant equations

    W = Fd (where d = distance)
    F = (fric. coeff)N (where N=normal force)
    Normal force in this case = weight
    w = mg

    P = Fv


    3. The attempt at a solution

    a) w = mg
    = 10(-9.8)
    = -98

    N = 98

    F = (fric. coeff)(N)
    = (0.6)(98)
    = 58.8

    W = Fd d = 3m
    = (58.8)(3)
    = 176.4 J

    b)
    P=Fv
    = (58.8)(1)
    =58.8W
     
  2. jcsd
  3. Nov 23, 2007 #2
    You got it right. What is your question?
     
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