Carbon steel balls (ρ = 7833 kg/m3 and cp =0.465 kJ/kg-°C) 8 mm in diameter are annealed b...

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