(Answered) A 12-lb block b slides without friction inside a slot cut

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A 1.2-lb block B slides without friction inside a slot cut in arm OA which rotates in a vertical plane at a constant rate, theta = 2 rad/s. At the instant when theta = 30 degrees, r = 2 ft and the force exerted on the block by the arm is zero.

Determine, at this instant,

(a) the relative velocity of the block with respect to the arm,

(b) the relative acceleration of the block with respect to the arm.

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