Q1- Consider a 0.6m0.6m thin square plate in a room at 30C. One side of the plate is maintained at a temperature of 90C, while the other side is insulated. Determine the rate of heat transfer from the plate by natural convection if the plate is (a) vertical, (b) horizontal with hot surface facing up, and (c) horizontal with hot surface facing down. Q2- A 10-m-long section of a 6-cm-diameter horizontal hot water pipe passes through a large room whose temperature is 20C. If the outer surface temperature of the pipe is 80C, determine the rate of heat loss from the pipe by natural convection. Q3-A vertical cylindrical container is being cooled in ambient air at 20C with no air circulation. If the initial temperature of the container surface is 80C, compute the surface heat transfer coefficient due to natural convection during the initial cooling period. The diameter of the container is 3m, and it is 10m high