Physics

Problem

Find the radius of the spherical cavity that must be drilled at the centre of a solid copper sphere of radius

5\,\text{cm}

so that the sphere just floats in water. Density of copper

=8.9\times10^{3}\,\text{kg m}^{-3}

, density of water

=1.0\times10^{3}\,\text{kg m}^{-3}

. a)

4.4\,\text{cm}

4.0\,\text{cm}

4.8\,\text{cm}

4.2\,\text{cm}