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4. Allison twirls an open umbrella around its central axis so that it completes 24.0 rotations in 30.0 s. a. If the umbrella starts from

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4. Allison twirls an open umbrella around its central axis so that it completes 24.0 rotations in 30.0 s. a. If the umbrella starts from rest, calculate the angular acceleration (in rad/s2) of a point on the outer edge. b. What is the maximum tangential speed of a point on the edge if the umbrella has a radius of 55.0 cm

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