A 100-kg solid cylindrical disk, 800 mm in diameter, is to be raised over a 200-mm obstruction. A cable is wrapped around the disk and pulled with a constant horizontal force T = 260 N as shown. Knowing that the corner of the obstruction at A is rough, determine the angular velocity of the disk when it has reached the top of the obstruction.

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200 mm T A OG B Fig. P17.25 and P17.26 800 mm