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A long steel rod 1 i n in diameter is initially at a uniform temperature of 1 2 0 0 F . It is suddenly

A long steel rod 1in in diameter is initially at a uniform temperature of 1200F. It is
suddenly immersed in a quenching bath of oil at 150F. In 4min, its center temperature
falls to 1000F. How long would it take to lower the temperature from 1200F to 1000F
if the diameter of the rod is 2in?
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