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Homework Help: Rotational Inertia of a Pulley System

  1. Apr 16, 2015 #1
    1. The problem statement, all variables and given/known data

    2. Relevant equations

    Kinetic Energy = 0.5 I w^2
    v = r * w
    torque = Inertia * angular acceleration
    3. The attempt at a solution

    That's the problem. I have no idea where to start. I assume that the end goal is to find the angular velocity, and convert to linear velocity, but I don't know how to go about doing that. Any hints are appreciated.
  2. jcsd
  3. Apr 16, 2015 #2


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    Science Advisor
    Homework Helper
    Gold Member

    Not exactly. Both are unknown, but they are related by the equation you quote.
    What will be the loss in PE as the pulley executes one revolution?
    If the linear speed of the masses is v, what is the angular speed of the pulley?
    In terms of v, what are the KEs of the masses and the pulley?
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