Conduction of Heat: What Is the Steady State Rate of Heat

Multiple Choice

Conduction of heat: What is the steady state rate of heat flow through a pane of glass that is 40.0 cm by 30.0 cm with a thickness of 4.00 mm when the outside temperature of the glass is -10.0°C and its inside temperature is 25.0°C? The thermal conductivity of glass is 0.105 W/(m∙K) , the specific heat of glass is 0.180 cal/(g ∙ °C) , and 1 cal = 4.190 J.

A) 24.2 W
B) 3.81 W
C) 18.6 W
D) 47.3 W
E) 110 W