Quandaries
and Queries 

The radius of a copper sphere is 3cm. If a wire of 0.4 diameter is drawn by melting it,what is the length of this wire? 

Hi, When you change the shape of the copper from a sphere to a long cylindrical wire, the amount of copper doesn't change. By the amount I mean the volume so the volume of the copper sphere and the volume of the cylinder are the same.
The volume of the sphere is
The volume of the cylinder is
Since the volume is unchanged
Solve for L. Penny 

