Physics

Problem

A thin-walled hollow steel sphere has an outer radius of

5\,\text{cm}

and a mass of

700\,\text{g}

. When placed in glycerine of density

1.26\,\text{g cm}^{-3}

, what will be its behaviour? a) It floats because its average density is

0.95\,\text{g cm}^{-3}

. b) It remains suspended because its average density equals

1.26\,\text{g cm}^{-3}

. c) It sinks because its average density is

1.34\,\text{g cm}^{-3}

. d) It floats because it can trap air inside.