A hanging iron wire with diameter 0.08 cm is initially 2.5 m long. When a 52 kg mass is hung from it, the wire stretches an amount 1.27 cm. A mole of iron has a mass of 56 grams, and its density is ....

A hanging iron wire with diameter 0.08 cm is initially 2.5 m long. When a 52 kg mass is hung from it, the wire stretches an

amount 1.27 cm. A mole of iron has a mass of 56 grams, and its density is . Find the approximate value of the

effective spring stiffness of the interatomic force.