The radius of a solid sphere of some metal is 3 cm. How long a wire of diameter 4 mm can be drawn from it?

A solid sphere of radius 3 cm is melted to form a hollow cylinder of height 4 cm and external diameter 10 cm. What is the thickness of the cylinder?

The diameter of a copper sphere is 6 cm. The sphere is melted and is drawn into a long wire of uniform circular cross-section. If the length of the wire is 36 cm, then its radius is

A metal sphere of radius 9 cm is melted and small balls of radius 0.6 cm are being made from it, the number of small balls are :

The surface area of a sphere is 616 sq. cm, then what will be its radius?

The length of a wire is 66 metre, then the number of circles of circumference 1.32 cm that can be made from the wire is :