Two pulleys are fastened together to form an integral unit. At a certain instant, the indicated belt tensions act on the unit and the unit is turning counterclockwise. Determine the angular acceleration of the unit for this instant if the moment due to friction in the bearing at O is 2.5 N ∙ m.

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1400 N m = 25 kg |ko = 250 mm 1150 N %3D 500 mm 650 N 300 mm 45° 475 N