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Homework Help: Interatomic stiffness

  1. Sep 22, 2009 #1
    1. The problem statement, all variables and given/known data
    One mole of iron has a mass of 56 grams and density of 7.87 g/cm^3. You have a long thin bar of iron, 2.0 m long, with a square cross section, 0.12 cm on a side. You hang the rod vertically and attach a 151 kg mass to the bottom, and you observe that the bar becomes 1.03 cm longer. Calculate the effective stiffness of the interatomic bond, modeled as a "spring":

    2. Relevant equations
    Y= (F/A)/(dL/L

    3. The attempt at a solution
  2. jcsd
  3. Sep 22, 2009 #2
    nvm i solved it
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