A horizontal copper plate (k= 374 W/m °C,  = 11.23x 10-5 m2/s) 10 cm thick is initially uniform in temperature at 250 °C. The bottom surface of the plate is insulated. The top surface is suddenly...

A horizontal copper plate (k= 374 W/m °C,  = 11.23x 10-5 m2/s) 10 cm thick is initially
uniform in temperature at 250 °C. The bottom surface of the plate is insulated. The top
surface is suddenly exposed to a fluid stream at 80 °C. The convection heat transfer
coefficient is 935 W/m2 °C. What are the temperatures at the top surface (Tt) and bottom
surface (Tb) after 6 minutes?