Question: A steel sphere 10 cm in diameter is suddenly immersed in a tank of oil at 10C. The initial temperature of the sphere is 220C;

A steel sphere 10 cm in diameter is suddenly immersed in a tank of oil at 10ºC. The initial temperature of the sphere is 220ºC; h = 5000 W/m2 · ºC. How long will it take the center of the sphere to cool to 120ºC?

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