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- Thread starter johnysmithers
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Simon Bridge

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Welcome to PF;

You use calculus ... divide the disk into narrow rings.

You use calculus ... divide the disk into narrow rings.

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Simon Bridge

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##d\tau = \mu g r \text{d}m##

The limits of the integration depend on how you define dm ...

hint: relate dm to dV (volume) and exploit the symmetry.

Friction

Friction torque always twists the opposite way to the angular velocity.

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