Problem 1.244

The ends of thin threads tightly wound on the axle of radius $r$ of the Maxwell disc are attached to a horizontal bar. When the disc unwinds, the bar is raised to keep the disc at the same height. The mass of the disc with the axle is equal to $m$, the moment of inertia of the arrangement relative to its axis is $I .$ Find the tension of each thread and the acceleration of the bar.