Carbon steel balls (r = 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 2500 balls are to be annealed per hour, determine the total rate of heat transfer from the balls to the ambient air.

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Fuce Air, 35°C ma 900 C Steel ba 100°C