Use the same approach I used for
http://www.jiskha.com/display.cgi?id=1298623724
One mole of tungsten has a mass of 184 grams, and its density is 19.3 grams per cubic centimeter, so the center-to-center distance between atoms is 2.51×10-10 m. You have a long thin bar of tungsten, 2.2 m long, with a square cross-section 0.16 cm on a side. You hang the rod vertically and attach a 418 kg mass to the bottom, and you observe that the bar becomes 0.983 cm longer. From these measurements, it is possible to determine the stiffness of one interatomic bond in tungsten. What is the spring stiffness of the entire wire, considered as a single macroscopic, very stiff spring?
How many side-by-side atomic chains are there in this wire? Assume that the tungsten atoms are arranged in a cubic lattice.
How many interatomic bonds are there in one atomic chain running the length of the wire?
What is the stiffness of a single interatomic "spring"?
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