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A horizontal wooden block has a fixed ro...

A horizontal wooden block has a fixed rod OA standing on it. From top point A of the rod, two wires have been fixed to points B and C on the block. The plane of triangle OAB is perpendicular to the plane of the triangle OAC. There are two identical beads on the two wires. One of the wires is perfectly smooth while the other is rough. The wooden block is moved with a horizontal acceleration (a) that is perpendicular to the line OB and it is observed that both the beads do not slide on the wire. Find the minimum coefficient of friction between the rough wire and the bead.

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The correct Answer is:
`mu_("min") = ("sin"theta)/(sqrt(cos^(2)theta + tan^(2)theta))`
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