Stainless steel ball bearings (p=8085 kg/m^3 and Cp=0.480 kJ/kg*C) having a diameter of 1.2 cm are to be quenched in water at a rate of 800 per minute. the balls leave the oven at a uniform temperature of 900 C and are exposed to air at 25 C for a while before they are dropped into the water. If the temperature of the balls drops to 850 C prior to quenching, determine the rate of heat transfer from the balls to the air.