A spiral spring, loaded with a piece os metal, extends by 10.5 cm in air, when the metal is fully submerged in water, the spring extends by 6.8 cm. Calculate the relative density of the metal. ( Assuming Hooke’s law is obeyed).

Answer 1

Fwater = k x = Volume * (density in water) * 6.8
Fair = k x = Volume * (density in air) * 10.5
density in air /density in water =10.5/6.8 = 1.54