A heater composed of Nichrome wire wound back and forth and closely spaced is covered on both sides with 1/8 - in. thickness of asbestos (k = 0.15 Btu/h ft °F) and then with a 1/8 -in. thickness of stainless steel (k = 10 Btu/h ft °F). If the center temperature of this sandwich construction is considered constant at 1000°F and the outside convective heat-transfer coefficient is 3 Btu/h ft² °F, how much energy must be supplied in W/ft² to the heater? What will be the outside temperature of the stainless steel?