Physics

Problem

A steel rod

0.25\,\text{m}

long is to conduct

120\,\text{W}

of heat between two plates maintained at

150^{\circ}\text{C}

and

50^{\circ}\text{C}

. The thermal conductivity of steel is

45\,\text{W m}^{-1}\,\text{K}^{-1}

. Determine the cross-sectional area the rod should have. Express your answer in

\text{m}^2