Mechanical Engineering > GATE 2017 SET-2 > Unsteady Heat Conduction
A metal ball of diameter 60 mm is initially at 220°C. The ball is suddenly cooled by an air jet of 20°C. The heat transfer coefficient is 200 W/m2.K. The specific heat, thermal conductivity and density of the metal ball are 400 J/kg.K, 400 W/m.K and 9000 kg/m3, respectively. The ball temperature (in °C) after 90 seconds will be approximately
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