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Bars in Equilibrium Question

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

    The bars are in equilibrium, each l = 3 m
    long, and each weighing W = 90 N. The
    string pulling down on the two bars is at-
    tached a = 0.8 m from the fulcrum on the
    lower bar and b = 0.7 m from the left end
    of the upper bar. The spring, of constant
    k = 28 N/cm is attached at an angle [tex]\theta[/tex] = 36 degrees at
    the left end of the upper bar.

    If the suspended mass is m = 3 kg, by how
    much will the spring stretch? Answer in units
    of cm.

    It is problem 4 in this link (includes picture and answer): http://webphysics.iupui.edu/152/152Sp08/homework/tp19s.pdf [Broken]

    2. Relevant equations

    Force of a spring(N) = -k(N/m) x(m)

    3. The attempt at a solution

    I really have no idea where to begin. I'm not trying to just get an answer the answer is inlcuded in the file I would just like a step-by-step explanation of how to get to the answer. Thanks
    Last edited by a moderator: May 4, 2017
  2. jcsd
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