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Q2 A sphere of diameter D which is at a uniform temperature of T is...

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Q2 A sphere of diameter D which is at a uniform temperature of T is suddenly removed from a furnace and suspended in a large room of air at uniform temperature of T There is a heat transfer by radiation determine the time taken by the sphere to cool to some temperature T k 200 W m K Cp 0 9 kJ kg K D 50mm T 800 k T 300 K T 400 K F 67x100 m K

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