The physical pendulum is a heterogeneous disk mounted on an axis. The pendulum performs small oscillations around a horizontal axis with a frequency of 15 rad / s. If a small load of mass m = 50 g is attached to it at a distance l = 20 cm below the axis, the oscillation frequency becomes equal to 10 rad / s. Determine the moment of inertia of this pendulum relative to the axis of swing.

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