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A yo-yo-shaped device mounted on a horizontal frictionless axis is used to lift a 26 kg box as shown in the figure. The outer radius R of the device is 0.46 m, and the radius r of the hub is 0.21 m. When a constant horizontal force of magnitude 170 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 0.98 m/s2. What is the rotational inertia of the device about its axis of rotation?

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