In Example 10.10 (Section 10.6) the angular speed changes,

Chapter 4, Problem 23DQ

(choose chapter or problem)

In Example 10.10 (Section 10.6) the angular speed changes, and this must mean that there is nonzero angular acceleration. But there is no torque about the rotation axis if the forces the professor applies to the weights are directly, radially inward. Then, by Eq. (10.7), must be zero. Explain what is wrong with this reasoning that leads to this apparent contradiction.

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