Find F12 and F21 for the following objects. a) Figure a shows a sphere placed inside a cube. The…

Find F12 and F21 for the following objects. a) Figure a
shows a sphere placed inside a cube. The side of the cube is the same as the
diameter of the sphere. b) Figure b shows a diagonally partitioned long square
duct. c) Figure c shows a pyramid with equal sides. d) Figure d shows quarter
of a cylinder exchanging radiation with the base surface of a half cylinder.