Physics

Problem

A concrete wall

0.20\,\text{m}

thick has an area of

10\,\text{m}^2

. The temperature difference between its two faces is

20\,\text{K}

. If the thermal conductivity of concrete is

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

, calculate the rate of heat flow through the wall in watts.