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an observer stands 20 m from the bottom of a Ferris wheel on a line that is perpendicular to the face of the wheel, with her eyes at the level of the bottom of the wheel. the wheel revolves at a rate of πrad/min and the observer's line of sight with a specific seat on the Ferris wheel makes an angle Ø with the horizontal. at what time during a full revolution is Ø changing most rapidly?

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