Question: A copper sphere having a diameter of 3.0 cm is initially at a uniform temperature of 50C. It is suddenly exposed to an airstream of

A copper sphere having a diameter of 3.0 cm is initially at a uniform temperature of 50ºC. It is suddenly exposed to an airstream of 10ºC with h = 15 W/m2·ºC. How long does it take the sphere temperature to drop to 25ºC?

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