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# Stability of the Leaning Tower of Pisa

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The Leaning Tower of Pisa is 55m tall and about 7m in diameter. The top is 4.5m off-center. How much further can it lean before it becomes unstable?

##### Solution Summary

We determine how much further the Tower of Pisa can lean and remain stable.

##### Solution Preview

The tower of Pisa would become unstable if its center of mass were to move to a point which is no longer directly above its base. This would happen if the top were to move another 2.5 m off-center (a total of 7.0 m off-center), because then the center of mass would be 3.5 m off-center assuming the tower were a ...

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