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A mass attached to a cord around a disk

  1. Mar 10, 2009 #1
    1. The problem statement, all variables and given/known data

    Imagine a frictionless pulley (a solid cylinder) of unknown mass M and radius r = 0.200 m which is used to draw water from a well. A bucket of mass m = 1.50 kg is attached to a massless cord wrapped around the pulley. The bucket starts from rest at the top of the well and falls for t = 3.00 s before hitting the water h = 9.99 m below the top of the well.

    What is the tension in the cord?
    What is the torque that is applied to the pulley due to the cord?

    2. Relevant equations
    Torque=force*radius
    Tension=mass*g?


    3. The attempt at a solution
    1. The problem statement, all variables and given/known data



    2. Relevant equations



    3. The attempt at a solution
     
  2. jcsd
  3. Mar 11, 2009 #2

    tiny-tim

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    Science Advisor
    Homework Helper

    Hi disque! :smile:
    Yes :smile:
    No … use conservation of energy to find the speed, differentiate for the acceleration, then use good ol' Newton's second law to find the tension :wink:
     
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