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A steel ball with radius 1.0 inches is at a uniform temperature of 800 °F. It...


A steel ball with radius 1.0 inches is at a uniform temperature of 800 °F. It is suddenly plunged into a liquid whose temperature is held constant at 250 °F. Assuming a heat transfer coefficient of 2.0 btu/(h*ft2°F), calculate the temperature of the ball after an hour. The relevant physical properties are k = 25 btu/ (h*ft°F), ? = 490 lb/ft3, and cp = 0.11 btu/(lb°F).

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