One mole of nickel (6 1023 atoms) has a mass of 59 grams, and its density is 8.9 grams per cubic centimeter. You have a long thin bar of nickel, 2.8 m long, with a square cross section, 0.15 cm on a side.You hang the rod vertically and attach a 231 kg mass to the bottom, and you observe that the bar becomes 1.41 cm longer. Calculate the effective stiffness of the interatomic bond, modeled as a "spring":
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