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Torque, etc

  1. Oct 22, 2013 #1
    1. The problem statement, all variables and given/known data
    You wish to buy a motor that will be used to lift a 15-kg bundle of shingles from the ground to the roof of a house. The shingles are to have a 1.5-m/s^2 upward acceleration at the start of the lift. The very light pulley on the motor has a radius of 0.11m. Determine the minimum torque that the motor must be able to provide. Express your answer to two significant figures and include the appropriate units.


    2. Relevant equations
    τ=±Fdsinθ



    3. The attempt at a solution

    ???
     
  2. jcsd
  3. Oct 22, 2013 #2

    Simon Bridge

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    Welcome to PF;
    Start with a free body diagram to work out the minimum force to get the required result.

    Why does it take the trouble to tell you the pulley is light?
    Why is the pulley radius important?
     
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