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Homework Help: Rotational Inertia, Torque and Angular Acceleration (1Q)

  1. Jan 19, 2016 #1
    1. The problem statement, all variables and given/known data

    . What is the angular acceleration if a force of 3 N is applied perpendicular to the radius of a 5 kg solid sphere that has a radius of 0.6 meters?
    2. Relevant equations
    tauv.gif = r x F
    I = mr^2

    3. The attempt at a solution
    I used 9be08b9254aaacbc0386b26bf137f2ae.png
    tried solving for angular acce.
    3N/(5kg)(0.6) =10rad/sec^2

    Also, if the question had said "hollow sphere" would the moment of inertia be different..(2/3)mr^2 ?
  2. jcsd
  3. Jan 19, 2016 #2


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  4. Jan 19, 2016 #3


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    For a solid sphere, I ≠ mR2; I = (2/5) M ⋅ R2

    Here is a list of the mass moments of inertia for a variety of different shapes:

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