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Torsional hollow ball

  1. Apr 23, 2013 #1
    1. A 560 g hollow ball 18 cm in diameter is suspended by a wire and is undergoing torsional oscillations at a frequency of 0.78 Hz. What is the torsional constant of the wire?

    2. Relevant equations
    3. The attempt at a solution
    tried to use the frequency to get the angular displacement and then just solve for k but I didn't get the answer
  2. jcsd
  3. Apr 24, 2013 #2
    do i have to use the rotational inertia of the hollow sphere? 2/3 M R^2 ??
  4. Apr 24, 2013 #3


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    Can you write the angular displacement of the ball as a function of time ?

    Yes. You will need that.
  5. Apr 24, 2013 #4
    as time... wouldn't it be something as Acoswt ?
  6. Apr 24, 2013 #5
    i already solved it! thanks! it was using this k=(w^2 )(I)
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