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Small glass balls of radius 1.1 mm are cooled in an oil bath at 22C. The balls enter the bath at 180C and are moved through on a conveyor belt. The...

Small glass balls of radius 1.1 mm are cooled in an oil bath at 22°C. The balls enter the bath at 180°C and are moved through on a conveyor belt. The estimated heat transfer coefficient is 75 W/m2/K. What should the conveyor speed be so that the balls leave at 40°C? The length of bath is 2.5 m.

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