A rough horizontal rod AB of length 0.45 m rotates with constant angular velocity 6 rad s⁻¹ about a vertical axis through A. A small ring R of mass 0.2 kg can slide on the rod. A particle P of mass 0.1 kg is attached to the mid-point of a light inextensible string of length 0.6 m. One end of the string is attached to R and the other end of the string is attached to B, with angle RPB = 60° (see diagram). R and P move in horizontal circles as the system rotates. R is in limiting equilibrium. [Figure 7.1]

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