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Between 1911 and l990, the top of the leaning bell

Between 1911 and l990, the top of the leaning bell

Between 1911 and l990, the top of the leaning bell tower at Pisa, Italy, moved toward the south at an average rate of 1.2 mm/y. The tower is 55 m tall. In radians per second, what is the average angular speed of the tower's top about its base?

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