The two concentric spheres of diameters D_i= 20 cm and D_o= 30 cm are separated by air at 1 atm pressure. The surface temperatures of the two spheres enclosing the air are T_i= 320 K and T_o= 280 K, respectively. Determine the rate of heat transfer from the inner sphere to the outer sphere by natural convection.

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Do= 30 cm T. = 280 K +L= 5 cm D;= 20 cm T= 320 K