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Homework Help: Hooke's law

  1. May 7, 2010 #1
    1. The problem statement, all variables and given/known data
    Hey, i need some help here
    I'm trying to figure out the spring constant for bungee jump

    Say, I'm 735N and the rope will apparently double in length when i jump off it.
    I don't know the length of the rope thought.
    but i do know it does have a spring constant.
    we are trying to find its N/m ratio.
    How to find out is the spring constant using the Hooke's Law F=-KX

    Please help :)


    2. Relevant equations
    F=-KX
    EPE=1/2KX^2
    EPE=GPE
    mgh=1/2kx^2


    3. The attempt at a solution

    i can't find the spring constant
     
  2. jcsd
  3. May 7, 2010 #2

    rl.bhat

    User Avatar
    Homework Helper

    Fall of potential - mgx.
    PE stored in the spring is 1/2kx^2
    -mgx = 1/2kx^2
    2mg = -kx
     
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