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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/m2K. The specific heat, thermal conductivity and density of the metal ball are 400 J/kgK, 400 W/mK and 9000 kg/m3, respectively. The ball temperature (in °C) after 90 seconds will be approximately
[2017]
  • a)
    141
  • b)
    163
  • c)
    189
  • d)
    210
Correct answer is option 'A'. Can you explain this answer?
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A metal ball of diameter 60 mm is initially at 220°C. The ball is ...




By solving, we get T = 141.3°C
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A metal ball of diameter 60 mm is initially at 220°C. The ball is ...
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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/m2K. The specific heat, thermal conductivity and density of the metal ball are 400 J/kgK, 400 W/mK and 9000 kg/m3, respectively. The ball temperature (in °C) after 90 seconds will be approximately[2017]a)141b)163c)189d)210Correct answer is option 'A'. Can you explain this answer?
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