A stainless-steel rod (18% Cr, 8% Ni) 6.4 mm in diameter is initially at a uniform temperature of 25◦C and is suddenly immersed in a liquid at 150◦C with h= 120 W/m2 · ◦C. Using the lumped-capacity method of analysis, calculate the time necessary for the rod temperature to reach 120◦C.

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