Physics

Problem

Calculate the rate of heat flow through a glass window pane of area

0.5\,\text{m}^2

and thickness

5\,\text{mm}

when the inner surface is at

20^{\circ}\text{C}

and the outer surface at

5^{\circ}\text{C}

. (Thermal conductivity of glass

k = 0.8\,\text{W m}^{-1}\text{K}^{-1}

.) a)

6.0\times10^{2}\,\text{W}

6.0\times10^{3}\,\text{W}

1.2\times10^{3}\,\text{W}

2.0\times10^{3}\,\text{W}