A small sphere of steel having a diameter of 10 cm and initially at 900°C is dropped into a large tank of oil at 50°C. What is the temperature of the sphere after 60 seconds? What is the cooling rate of the ball? Given h = 500 w/m²k, Ksteel = 60.5 W/m k, Csteel = 434 J/m k, Psteel = 7854 kg/m³ (State all assumptions and Show All Work)

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A:

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