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1. (4 points). Consider a 0.6 m x 0.6 m thin square plate in a room at 30°C. One side of the plate is maintained at a temperature of 90°C, while the other side is insulated, as shown in the figure below.Determine the rate of heat transfer from the plate by natural convection if the plate is b) horizontal with the hot surface facing up and c) horizontal with the hot surface facing down. Note: Consider In-class problem #29 as part (a). Here you are asked to solve for part b and c (as shown below). You can use the same thermos-physical properties we used in the class.

Fig: 1

Fig: 2