The 4-ft slender bar AD weighs 40 lb with mass center at B and is released from

Question

The 4-ft slender bar AD weighs 40 lb with mass center at B and is released from rest in the position for which is essentially zero. Point B is confined to move in the smooth vertical guide, while end A moves in the smooth horizontal guide and compresses the spring as the bar falls. 

-Locate the Instantaneous Center of Zero Velocity (IC) when = 30

-Determine the angular velocity of the bar as the position = 30° is passed, and determine the velocity with which B strikes the horizontal surface if the stiffness of the spring is 30 lb/in

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