A 255-lbr block is suspended from an inextensible cable which is wrapped around a drum of 1.75-ft radius rigidly attached to a flywheel. The drum and flywheel have a combined centroidal moment of inertiaī = 12 Ib . ft.s2. At the instant shown, the velocity of the block is unknown directed downward. Knowing that the bearing at A is poorly lubricated and that the bearing friction is equivalent to a couple M of magnitude 65 Ib .ft, determine the velocity of the block before it has moved 3.5 ft downward if at S2 speed is 13.5ft/s. +1.5ft. 255-lbf.

A 255-lbr block is suspended from an inextensible cable which is wrapped around a drum of 1.75-ft radius rigidly attached to a flywheel. The drum and flywheel have a combined centroidal moment of inertiaī = 12 Ib . ft.s2. At the instant shown, the velocity of the block is unknown directed downward. Knowing that the bearing at A is poorly lubricated and that the bearing friction is equivalent to a couple M of magnitude 65 Ib .ft, determine the velocity of the block before it has moved 3.5 ft downward if at S2 speed is 13.5ft/s. +1.5ft. 255-lbf.

Glencoe Physics: Principles and Problems, Student Edition

1st Edition

ISBN:9780078807213

Author:Paul W. Zitzewitz

Publisher:Paul W. Zitzewitz

Chapter8: Rotational Motion

Section: Chapter Questions

Problem 93A

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