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The 0.1 kg pin Pis constrained to move in the smooth curved groove in a horizontal plane. Its motion is controlled by the rotation of the slotted arm OA which rotates counterclockwise. When 0 = 30⁰, 0 = | 0.4 rad/s and 8 = 0.8 rad/s². Determine the force the slotted arm OA exerts on the pin at this position. r = (0.6 cos 20) m