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Yo you physics problem, please help

  1. Nov 16, 2008 #1
    yo you physics problem, please help!!

    A yo-yo has a rotational inertia of 820 g·cm2 and a mass of 115 g. Its axle radius is 3.9 mm and its string is 120 cm long. The yo-yo is thrown so that its its initial speed down the string is 0.8 m/s.
    (a) How long does the yo-yo take to reach the end of the string?
    (b) As it reaches the end of the string, what is its total kinetic energy?
    J
    (c) As it reaches the end of the string, what is its translational speed?
    m/s
    (d) As it reaches the end of the string, what is its translational kinetic energy?
    J
    (e) As it reaches the end of the string, what is its rotational speed?
    rad/s
    (f) As it reaches the end of the string, what is its rotational kinetic energy?
    J
    Can someone please explain how to do this?
     
  2. jcsd
  3. Nov 16, 2008 #2

    rcgldr

    User Avatar
    Homework Helper

    Re: yo you physics problem, please help!!

    Assume the string is infinitely thin, doesn't stretch, and no slippage. Compute the energy gain from decrease in height and figure out how this increase is distributed between angular and linear energy.
     
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