Question: A lead sphere with d = 1.5 mm and initial temperature of 200C is suddenly exposed to a convection environment at 100C and h =

A lead sphere with d = 1.5 mm and initial temperature of 200ºC is suddenly exposed to a convection environment at 100ºC and h = 5000 W/m2 · ºC. Calculate the time for the center temperature to reach 120ºC.

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