A hollow copper sphere has an external radius of and an internal radius of

MATHEMATICS · Subjective · CBSE · Mathematics · Surface Areas and Volumes · Surface Areas and Volumes

Problem

A hollow copper sphere has an external radius of

10\,\text{cm}

and an internal radius of

9\,\text{cm}

. If the density of copper is

8.9\,\text{g/cm}^3

, determine the mass of the sphere in kilograms.