The figure below depicts an amusement park ride, looking down from above. The lo

Question

The figure below depicts an amusement park ride, looking down from above. The long arm rotates counter-clockwise at a constant rate ? about point O. At the end of the arm, there is a large disk centered at point P. A motor, which is mounted to the arm, spins the disk clockwise at a constant rate of 412, relative to the arm 2R The disk has radius R, and the arm has length 2R. Four of your friends (Alice, Bart, Caroline, and Dexter) are seated on this ride, at the edge of the disk, at locations labeled A. B, C, and D, respectively. Notice that the questions below are about kinematics, not kinetics. Therefore, you should NOT use the problem solving checklist. However, you should make rigorous arguments, based on kinematic definitions.

Explanation / Answer

Ans 7- At a point P on the the velocity is zero because point p is at the center of the disk and radius is zero. Therefore velocity at an instant is zero on the point p.

Ans 8 - All friends are accelerating away from the point O.

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