A system of three point particles of equal masses 45 gm are initially connected by three rods of negligible mass to an axis of rotation perpendicular to the plane of the particles as shown in the figure-1. (a) What is the moment of inertia of the system of three particles?

(b) If the massless rods are replaced by three rods of equal masses of 65 gm keeping

their lengths unchanged, what is the moment of inertia of the system now?

(c) If the systems rotate at 4.75 rev/s, what are the systems rotational kinetic

energies?