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Power up and incline with friction

  1. Sep 29, 2008 #1
    1. The problem statement, all variables and given/known data
    A 1400 kg block of granite is pulled up an incline that has an angle of inclination θ = 29 ° with a constant speed of 1.13 m/s by a steam winch (see Figure). The coefficient of kinetic friction between the block and the incline is 0.12. How much power must be supplied by the winch?


    2. Relevant equations
    T= uW/cos(theta)+u*sin(theta)
    P=Fv


    3. The attempt at a solution
    T= .12(1400*9.8)/cos(29)+.12*sin(29)
    T= 1765.0 N

    P= FV
    P= 1765*1.13
    P= 1994.5 W
     
  2. jcsd
  3. Sep 29, 2008 #2

    LowlyPion

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    That equation does not look correct
     
  4. Sep 29, 2008 #3
    wait do you mean the equation itself or I put in the values wrong?
     
  5. Sep 29, 2008 #4

    LowlyPion

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    That equation is incorrect.
     
  6. Sep 29, 2008 #5
    Figured that much, but I was hopeful.

    Could you give me a hint or something, I think I might now the equations I need but my notebook is at my dorm right now and my next class is about to start.
     
  7. Sep 29, 2008 #6

    LowlyPion

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    Tension is going to equal the frictional resistance and the weight down the incline.

    You don't need your notebook.
     
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