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Homework Help: Problem about pulley system

  1. Sep 28, 2011 #1
    Hi everybody, I was doing my physics homework but I found that I cannot figure out how to do it, here is the question:


    I don't quite understand how to calculate the torsional spring constant, so explanation on part a is enough:D Thanks for your help!!
    Last edited by a moderator: Apr 26, 2017
  2. jcsd
  3. Sep 28, 2011 #2

    rude man

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    Homework Helper
    Gold Member

    If you turn the disk an angle Θ, what restorative torque is applied to the disk by the strings?

    (Both strings can be stretched a certain amount, in general, before you turn the disk).
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