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15 pts. Stainless steel ball bearings (=8085kg/m3 and cp=0.480k/kgC) having a radius of 0.5cm are to be quenched in water at a rate of 780

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15 pts. Stainless steel ball bearings (=8085kg/m3 and cp=0.480k/kgC) having a radius of 0.5cm are to be quenched in water at a rate of 780 per minute. The balls leave the oven at a uniform temperature of 940C and are exposed to air at 25C for a while before they are dropped into the water. If the temperature of the balls drops to 870C prior to quenching, determine the rate of heat transfer from the balls to the air in kW

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