A long rod of 60-mm diameter and thermophysical properties rho=8000 kg/m^3, c=500J/kgK, and k=50 W/mK is initally at a uniform t
emperature in a forced convection furnace maintained at 750K. The convection coeffiecent is estimated to be 1000 W/m^2K. What is the centerline temperature of the rod when the surface temperature is 550K?