A solid sphere of mass \( m \) is lying at rest on a rough horizontal surface. The coefficient o...

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A solid sphere of mass \( m \) is lying at rest on a rough horizontal surface. The coefficient of friction between the ground and
\( \mathrm{P} \) sphere is \( \mu \). The maximum value of \( F \), so that the sphere

W will not slip, is equal to
(1) \( \frac{7}{5} \mu m g \)
(2) \( \frac{4}{7} \mu m g \)
(3) \( \frac{5}{7} \mu m g \)
(4) \( \frac{7}{2} \mu m g \)
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