A brick wall of area separates a room at from the outside air at

PHYSICS · Subjective · AP · Physics 2: Algebra-based · Thermodynamics · Thermodynamics

Problem

A brick wall of area

2.0\,\text{m}^2

separates a room at

35^{\circ}\text{C}

from the outside air at

15^{\circ}\text{C}

. The thermal conductivity of brick is

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

. Calculate the minimum thickness the wall must have so that the heat flow rate through it does not exceed

30\,\text{W}

. Give your answer in metres.