a A bar of PQ of weight $W$ is supported as shown in fig and a force…

Question

a A bar of PQ of weight $W$ is supported as shown in fig and a force $F$ is acting on the bar, Using the principle of virtual work, derive an expression in terms of $W$ and $F$ for the effort $R$ applied at $Q$ for equilibrium. Friction may be neglected. Take $W=500N, F=700N, \theta=60^{\circ}$

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