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The ball bearing made of steel is to be heat treated. It is heated to a temperature of 620C and then quenched in water

The ball bearing made of steel is to be heat treated. It is heated to a temperature of 620C and then quenched in water that is at a temperature of 50C. The ball bearing has a diameter of 5 cm and the convective heat transfer coefficient between the bearing and water is 200W/m.K Determine: a) The length of time that the bearing must remain in water before the temperature at its center drops to 150C [Ans: 119.53s) b) The total heat removal from the bearing during the time interval [Ans:36.13 KJ

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