Two wheels of moment of inertia 4 kg m? rotate side by side at the rate of 120 rev | min and 240 rev / min respectively in the opposite directions. If now both the wheels are coupled by means of weightless shaft so that both the wheels now rotates with a common angular speed. Find the new speed of rotation.

Two wheels of moment of inertia 4 kg m? rotate side by side at the rate of 120 rev | min and 240 rev / min respectively in the opposite directions. If now both the wheels are coupled by means of weightless shaft so that both the wheels now rotates with a common angular speed. Find the new speed of rotation.