One mole of nickel has mass of 59 grams and a density of 8.9 g/cm3. A long bar of nickel, 2.6m long, with a square cross section, 0.14 cm on a side is given.

A rod is hung vertically, attached is a 202 kg mass to the bottom.  It's observed that it becomes 1.31cm longer.   Calculate the effective stiffness of the interatomic bond, modeled as a "spring."

ks=   (N/m)


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