2. A bar having a diameter of 10 cm has a uniform temperature of 30 °C. It is placed in a medium at 740 °C with a convective coefficient of 20 W/m²K. Calculate the time required for the bar to reach 340 °C. Take k= 17 W/mK, density = 540 Kg/m' and Cp = 1070 J/Kg K

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