Assume a combustion chamber with 0.5 in steel wall is lined with 4 in firebrick to protect the steel. The wall has 3 in of magnesia insulation on the outside. The thermal conductivity of magnesia is 0.034 Btu/ft.h.F. When the gas temperature is 1,400F, the inside wall of the firebrick is at 1,200F. The outside temperature of the magnesia is 120F. a)What is the temperature of the steel wall in F? b)What is q/A in Btu/ft2? c)What would be the thickness of magnesia insulation (in) to raise the temperature of the inside wall of the firebrick to 1,300F? q/A will now be slightly reduced but assume it's unchanged from the one calculated in part b. Make sure to indicate the source(s) of the thermal conductivities and show work for any needed interpolation