Four particles, each of mass 0.200kg, are placed at the vertices of a square with sides of length 0.500m. The particles are connected by rods of negligible masses. This rigid body can rotate in a vertical plane about a horizontal axis that passes through one of the particles (A for example, as shown in figure attached.) (a) What is the rotational inertia I of the body about axis A? (b) What is the net torque Tnet about axis A (due to the gravitational forces), when the rod AB is horizontal? (c) What is the angular acceleration a of the body at the instant rod AB is horizontal?