The moment of inertia of a cup suspended on a wire with respect to the torsion axis of this wire is I0. The period of torsional oscillations of the system is T0. A load is placed on the cup. At the same time the period of torsional oscillations changed and became equal to T. What is the moment of inertia of the load relative to the same torsion axis? The moment of forces arising during twisting of the wire is proportional to the angle of twist.