Question: 5 . 6 8 In a manufacturing process, long rods of different diameters are at a uniform temperature of 4 0 0 C in a

5.68 In a manufacturing process, long rods of different diameters are at a uniform temperature of 400C in a curing oven, from which they are removed and cooled by forced convection in air at 25C. One of the line operators has observed that it takes 280 s for a 40-mm- diameter rod to cool to a safe-to-handle temperature of 60C. For an equivalent convection coefficient, how long will it take for an 80-mm-diameter rod to cool to the same temperature? The thermophysical properties of the rod are =2500kgm3,c=900Jkg*K, and k=15Wm*K. Comment on your result. Did you anticipate this outcome?
5 . 6 8 In a manufacturing process, long rods of

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