Chapter 4, Problem 18P

Metal plates $\text{(k = 180 W/m}\text{.K, }p=2800{\text{ kg/m}}^{\text{3}}\text{, }and{\text{ c}}_{\text{p}}\text{= }880\text{ J/kg}\text{.K)}$ and with a thickness of 1 cm are being heated in an oven for 2 min. Air in the oven is maintained at 800°C with a convection heat transfer coefficient of 200 W/m² K. If the initial temperature of the plates is 20°C, determine the temperature of the plates when they are removed from the oven.