Four particles, each of mass 0.20 kg, are placed at the vertices of a square with sides of length 0.50 m. The particles are connected by rods of negligible mass. This rigid body can rotate in a vertical plane about a horizontal axis A that passes through one of the particles. The body is released from rest with rod AB horizontal (Fig. 10-65).
(a) What is the rotational inertia of the body about axis A?
(b) What is the angular speed of the body about axis A when rod AB swings through the vertical position?