Chapter 1, Problem 1.11P

The heat flux that is applied to one face of a plane wall is $q"=20W/m^2.$ The opposite face is exposed to air at temperature $30°\text{C,}$ with a convection heat transfer coefficient of $20{\text{W/m}}^{\text{2}}\cdot \text{K}\text{.}$ The surface temperature of the wall exposed to air is measured and found to be $50°\text{C}\text{.}$ Do steady-state conditions exist? If not, is the temperature of the wall increasing or decreasing with time?