How Is the Effective Stiffness of an Interatomic Bond Calculated in Iron?

[magma_saber]

Homework Statement

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":

Homework Equations

Y= (F/A)/(dL/L
Y=ks/d

The Attempt at a Solution

Y=[(151*9.8)/(0.12e-2)²]/[(1.03e-2)/2]

 

[magma_saber]

nvm i solved it