Question: Consider a 2-ft 2-ft thin square plate in a room at 75F. One side of the plate is maintained at a temperature of 130F,

Consider a 2-ft × 2-ft thin square plate in a room at 75°F. One side of the plate is maintained at a temperature of 130°F, 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,

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