The motor on the car wash sprayer in Figure P7.38 rotates counterclockwise at a constant rate of

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Step 1: Identify the given information. The motor rotates counterclockwise at a constant rate of

The motor on the car wash sprayer in Figure P7.38 rotates counterclockwise at a constant rate of 120 rpm . At the instant when $\theta=40^{\circ}$, use the relative acceleration method to graphically determine the angular velocity and angular acceleration of the nozzle arm. (FIGURE CAN'T COPY)