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The 25-lb slender rod has a length of 6 ft. Using a collar of negligible mass,

its end A is confined to move along the smooth circular bar of radius 32√ ft. End B rests on the floor, for which the coefficient of kinetic friction is μB = 0.56. The bar is released from rest when θ = 30∘.


a) Determine the angular acceleration of the bar at this instant, measured clockwise.


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