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A solid iron sphere with a diameter of 5 mm is initially at a uniform temperature of T=1550 C and is suddenly quenched in

A solid iron sphere with a diameter of 5 mm is initially at a uniform temperature of T=1550 C and is suddenly quenched in a large oil bath for which To0,1 =135 C and h=160 W/m.K. The properties of iron are p=7650 kg/m, c=690 J/kg-K, k-34 W/m.K. The sphere is removed from the oil bath after 30 sec, and it is immersed in another fluid for which Too,295 C and h=210 W/m K during 30 sec. What is the temperature of the sphere in C at the end of this process?

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