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Carbon steel balls (ρ = 7833 kg/m3 and cp = 0.465 kJ/ kg·°C) 8 mm in diameter are annealed by heating them first to 900°C in a furnace and then allowing them to cool slowly to 100°C in ambient air at 35°C. If 1200 balls are to be annealed per hour, determine the rate of heat transfer from the balls to the air.

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