QUESTION $4$: Consider a steel wall that has a thickness of $0\mathrm{.}04$ m $.$ The wall is heavily insulated on the outside, and the before the initiation of flow on the surface of the wall, the wall are at uniform temperature of $0$ C $.$ With initiation of the flow, hot oil at $80$ C is flowing from from the surface, creating convective condition corresponding to $h=500\frac{W}{m^2}K$ at the surface. What is the temperature of the steel wall under the insulation