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Homework Help: Rotesional kenitic energy

  1. Nov 29, 2008 #1
    Hi I have some question on rotational kenitic energy.here is my question

    If someting rolling motion the total kinetic energy is the translation kinetic energy and the rotational kinetic
    Energy.where I am confuse is what if someting rotating in the air like a fan,air conditioner
    What would be the kinetic energy would that be 1/2Iw^2.......for circle.
  2. jcsd
  3. Nov 29, 2008 #2


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    Homework Helper

    Your fan blades would have rotational kinetic energy only if the fan is at rest.

    And yes that would be ½Iω².

    Determining the moment of inertia would be your only problem depending on the shape of the blade.
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