Question

what is the length of wire of 3.5mm diameter that can be drawn from 7 .7 cu.cm of gold

Answer 1

Diameter = 3.5mm Radius = 3.5/2 mm
Let the length of wire be h
volume of wire = given volume of gold
πr²h = 7.7 cm³ = 7700 mm³
(22/7)×(3.5/2)×(3.5/2)×h = 7700
By solving
h = 800mm = 8cm