A light thread is wound on a disk of mass \( m \) and other end of ...

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A light thread is wound on a disk of mass \( m \) and other end of thread is connected to a
\( \mathrm{P} \) block of mass \( \mathrm{m} \), which is placed on a rough ground as shown in diagram. Find the
W minimum value of coefficient of friction for which block remain at rest.
(1) \( \frac{1}{3} \)
(2) \( \frac{1}{4} \)
(3) \( \frac{1}{2} \)
(4) \( \frac{1}{5} \)
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