The circular plate shown rotates about its vertical diameter at the constant rate 1 = 10 rad/s.

The circular plate shown rotates about its vertical diameter at the constant rate ω1 = 10 rad/s. Knowing that in the position shown the disk lies in the XY plane and point D of strap CD moves upward at a constant relative speed u = 4.5 ft/s, determine

(a) The velocity of D,

(b) The acceleration of D.

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