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Homework Help: Force and motion problem

  1. Jun 30, 2015 #1
    1. The problem statement, all variables and given/known data
    A puck of mass m = 1.00 kg slides in a circle of radius r = 17.0 cm on a frictionless table while attached to a hanging cylinder of mass M = 3.70 kg by a cord through a hole in the table. What speed keeps the cylinder at rest?


    2. Relevant equations
    F=ma, a=v2/r

    3. The attempt at a solution
    I dont see why 0.785m/s is incorrect. thanks.

  2. jcsd
  3. Jun 30, 2015 #2


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    The radius is 17 cm, not 1.7 cm.
  4. Jun 30, 2015 #3
    thanks, what an elementary mistake.
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