A hanging iron wire with diameter 0.09 cm is initially 2.0 m long. When a 65 kg mass is hung from it, the wire stretches an amount 1 cm. A mole of iron has a mass of 56 grams, and its density is 7.87...

A hanging iron wire with diameter 0.09 cm is initially 2.0 m long. When a 65 kg mass is hung from it, the wire stretches an

amount 1 cm. A mole of iron has a mass of 56 grams, and its density is 7.87 g/cm3.

(a) What is the length of an interatomic bond in iron (diameter of one atom)?

(b) Find the approximate value of the effective spring stiffness of one interatomic bond in iron.