The change in gravitational potential energy is compared to the sum of the rotational kinetic energy of the falling mass and the rotational kinetic energy of the main platter.
(The change in gravitational potential energy; is compared; to the sum of the rotational kinetic energy of the falling mass and the rotational kinetic energy of the main platter)
The change in gravitational potential energy
is compared
to the sum of the rotational kinetic energy of the falling mass and the rotational kinetic energy of the main platter