A cube $35$ cm on each external side is constructed of fireclay brick. The wall thickness

is $5\mathrm{.}0$ cm$.$ The inner surface temperature is $500$C$,$ and the outer surface temperature

is $80$C$.$ Compute the heat flow in watts. $3\mathrm{.}1$ A cube $35$ cm on each external side is constructed of fireclay brick. The wall thickness is $5\mathrm{.}0$ cm $.$ The inner surface temperature is $\backslash (500^\{\backslash$circ$\}\backslash$mathrm$\{$C$\}\backslash ),$ and the outer surface temperature is $\backslash (80^\{\backslash$circ$\}\backslash$mathrm$\{$C$\}\backslash ).$ Compute the heat flow in watts.