A long cylindrical object with diameter D=100cm (k=400 W/mK,CÂp = 400 J/kg K, density = 9000 kg/m3) isput into an oven of 1100 K with convective
heat transfer coefficient h of 50 W/m2 K. The initialtemperature of this object is 300 K. How much time does it take forthe center of the object to reach
700K? How much time does it take for thesurface of the object to reach 700K?