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A steel ball having a radius of 1.0 in. (25.4 mm) is at a uniform temperature of 800F. It is suddenly plunged into a medium

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A steel ball having a radius of 1.0 in. (25.4 mm) is at a uniform temperature of 800F. It is suddenly plunged into a medium whose temperature is held constant at 250F. Assume a convective coefficient of h=2.0Btu/(hft2F) and average physical properties as k=25Btu/(hftF),=490 lbm/ft3, and Cp=0.11Btu/(lbmF). Calculate the temperature of the ball after 1h (3600 s). Assume Biot Number

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