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     EduGorilla 
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    A metal ball of diameter 60 mm is initially at 2200C. The ball is suddenly cooled by an air jet of 20o C. The heat transfer coefficient is 200 W/m2.K. The specific heat of metal, thermal conductivity and density of the metal ball are 400 J/kg.K, 400 W/m K and 9000 kg/m, respectively.

    The ball temperature (in oC) after 90 seconds will be approximately

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