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Steel balls 20mm in diameter are annealed by heating to 870C and then slowly cooling to 80C in an air environment for which T=50C and

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Steel balls 20mm in diameter are annealed by heating to 870C and then slowly cooling to 80C in an air environment for which T=50C and h=15W/(m2K). Assuming the properties of the steel to be k=45W/(m.K),=7850kg/m3, and cp=500J/kg.K), estimate the time required for the cooling process

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