Question

Consider a 150-mm-thick steel plate (k = 50 W/m. K,p = 8000 kg/m³ ,c = 500 J/kg. K) that isinitially at a uniform temperature of 30°C and is heated (on both sides) in a gas-fired furnace for which1000°C and hfTo= 400 W/m².K. How long will it take for the minimum temperature in the plate to reach 700°C? Use first four terms in time dependent heat equation.

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