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A disc on an inclined plane

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(Please see the attached file and solve number 4 only)

A uniform disk of mass m=20 lb and radius r=9 inches is placed in contact with an inclined surface and a constant couple M = 7.5 lb.ft is applied as shown (see attachment). The weight of link AB is negligible. Knowing that theta = 30 degree and the coefficient of kinetic friction at D is k = 0.4, determine the angular acceleration of the disc and the force in the link AB.

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A disc on an inclined plane is determined. Step by step solution provided.

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