The figure below shows a rigid structure consisting of a circular hoop of radius R and mass m, and a square made of four thin bars, each of length R and mass m. The rigid structure rotates at a constant speed about a vertical axis, with a period of rotation of 1.0 s.
(a) Assuming R = 0.20 m and m = 3.0 kg, calculate the structure's rotational inertia about the axis of rotation.
kg·m2
(b) What is its angular momentum about that axis?
kg·m2/s