In problems 5 - ll], divide The flat plate in each Figure inTh rectangles and semicircles, calculate The mass, Imments and centers of mass of each piece, and use These results to nd The center cfmass cf the plate. Assume That the density of the plate is l gleam: . Plot The location of the center of mass for each shape. {See Enmple 4 for the ceutmid of a semicircular region.) 7. Fig. 21 Fig. 21