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Potential Energy in Joules

  1. Oct 18, 2009 #1
    1. The problem statement, all variables and given/known data

    A spiral spring is twisted from its equilibrium position through θ = 7° by an average torque of 60 Nm. What is its potential energy in Joules?
    http://schubert.tmcc.edu/res/msu/mmp/kap8/picts/spring2.gif

    2. Relevant equations



    3. The attempt at a solution

    I am not even sure how this is possible without the spring constant.. Any help would be greatly appreciated.
     
    Last edited by a moderator: Apr 24, 2017
  2. jcsd
  3. Oct 19, 2009 #2
    You know the torque and how much the string is twisted. Surely you can find the spring constant?
     
  4. Oct 19, 2009 #3
    In linear motion problems we have a formula for work in terms of force and displacement. You need to find the formula that is analogous to this but used for rotational motion.
     
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