Steel rods (ρ = 7832 kg/m3 , cp = 434 J/kg·K. and k = 63.9 W/m2 ·K) are heated in a furnace to 850°C and then quenched in a water bath at 50°C for a period of 40 seconds as part of a hardening process. The convection heat transfer coefficient is 650 W/m2 ·K. If the steel rods have diameter of 40 mm and length of 2 m, determine their average temperature when they are taken out of the water bath.
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