Discuss the following:
Q: A square plate of pure aluminum 0.5 m on a side and 16 mm thick is initially at 300°C and is suspended in a large chamber. The walls of the chamber are maintained at 27°C, as is the enclosed air. If the surface emissivity of the plate is 0.25, what is the initial cooling rate? Is it reasonable to assume a uniform plate temperature during the cooling process?