1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

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
    F=-κθ
    ω=sqrt(κ/I)
    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

    SammyS

    User Avatar
    Staff Emeritus
    Science Advisor
    Homework Helper
    Gold Member

    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)
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted



Similar Discussions: Torsional hollow ball
Loading...