A yo-yo-shaped device mounted on a horizontal frictionless axis is used

A yo-yo-shaped device mounted on a horizontal frictionless axis is used

A yo-yo-shaped device mounted on a horizontal frictionless axis is used to lift a 30 kg box as shown in Fig. 10-59. The outer radius R of the device is 0.50 m, and the radius r of the hub is 0.20 m. When a constant horizontal force  of magnitude 140 N is applied to a rope wrapped around the outside of the device, the box, which is suspended from a rope wrapped around the hub, has an upward acceleration of magnitude 0.80 m/s².What is the rotational inertia of the device about its axis of rotation?

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