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Homework Help: Potential Energy of Spring

  1. Nov 9, 2009 #1
    1. The problem statement, all variables and given/known data

    The force exerted by an unusual spring when it's compressed a distance 20cm from equilibrium is given by F= -kx-cx3, where k= 233 N/m and c= 4.0kN/m3

    Question: Find the energy stored in this spring when it's been compressed 20cm.

    2. Relevant equations
    Equation already given, I think we supposed to use that one. But the equation of spring constant is Us= (1/2)kx02-(1/2)kxf2.

    3. The attempt at a solution.
    I actually just put in the right numbers in the equation given, but was incorrect. Did integrate the function, and was wrong. No clue what to do.
  2. jcsd
  3. Nov 9, 2009 #2
    Force doesn't equal energy. Hope that helps haha :)
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