Find the acceleration of \(Q\) while \(P\) and \(B\) are in contact.
Determine the coefficient of friction between \(P\) and \(B\).
Given that the coefficient of friction between \(B\) and the horizontal surface is \(\frac { 5 } { 49 }\), determine the least possible value for the mass of \(B\).
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A uniform rod \(A B\) of mass 4 kg and length 3 m rests in a vertical plane with \(A\) on rough horizontal ground.
A particle of mass 1 kg is attached to the rod at \(B\). The rod makes an angle of \(60 ^ { \circ }\) with the horizontal and is held in limiting equilibrium by a light inextensible string \(C D . D\) is a fixed point vertically above \(A\) and \(C D\) makes an angle of \(60 ^ { \circ }\) with the vertical. The distance \(A C\) is \(x \mathrm {~m}\) (see diagram).
Find, in terms of \(g\) and \(x\), the tension in the string.
The coefficient of friction between the rod and the ground is \(\frac { 9 \sqrt { 3 } } { 35 }\).