ch Equilibrium of rigid bodies -72 3. a. A T-shaped sheet of uniform thickness has a uniform mass density. 15 the center of mass of the sheet located above point R, below point R, or atpoinr R? Explain your reasoning. (Him: Do not assume that this board is identical to the one used in the tutorial Equilibrium of rigid bodies.) b. A different T-shaped sheet of uniform thickness is composed of two different materials designated by the shaded and unshaded regions in the diagram at right. The mass density ofeach piece is uniform throughout its volume. The mass density of the shaded piece is twice as large as the mass density of the unshaded piece. Is the center of mass of the sheet located above paim R. below point R, or at point R? Explain your reasoning. Unshaded region