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Question: 57 wp steel balls 10 mm in diameter are annealed...

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5-7 WP Steel balls 10 mm in diameter are annealed by heating to 1150 K and then slowly cooling to 450 K in an air environment for which T-325 K and h -25 W/m2 K. Assuming the properties of the steel to be k-40 w/m K, ρ-7800 kg/m3, and c-600 kg estimate the me required for he cooling process.

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