What is the minimum coefficient of friction for a hollow sphere to ...

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What is the minimum coefficient of friction for a hollow sphere to roll without
P slipping down an inclined plane of

W inclination \( \theta \) ?
(1) \( \frac{5}{2} \tan \theta \)
(2) \( \frac{2}{7} \tan \theta \)
(4) \( \frac{7}{2} \tan \theta \)
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