A household iron has a surface area of 0.05 m2and is made of stainless steel having weight of 1.4 kg and 500 W capacity. If h = 17 W/m2K on the surface and air at 30°C, how long it takes iron to reach 110°C. Take p = 8000 kg/m3, C,, = 500 J/kg°C & k = 20 W/m2C. Find out the Biot number.
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