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An interesting fire escape possibility involves a platform attached to a rope th

ID: 1362165 • Letter: A

Question

An interesting fire escape possibility involves a platform attached to a rope that is wound around a massive, solid cylindrical flywheel that is free to rotate about its central axis. (See the not-to-scale diagram below.) A person steps out of a window onto the platform and falls at increasing speed to the ground below, causing the flywheel to angularly accelerate at the same time. The massive flywheel constrains the rate at which the person falls to the ground. Assume a safe landing speed to be 2.00 m/s on the ground, 10.0 m below the starting position. Your task is to determine the flywheel mass needed, using three different techniques. The person and platform mass is 80.0 kg; the flywheel's radius is 0.800 m.

Explanation / Answer

An interesting fire escape possibility involves a platform attached to a rope th

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