OAB is a uniform lamina in the shape of a quadrant of a circle with centre O and radius 0.8 m which has its centre of mass at G. The lamina is smoothly hinged at A to a fixed point and is free to rotate in a vertical plane. A horizontal force of magnitude 12N acting in the plane of the lamina is applied to the lamina at B. The lamina is in equilibrium with AG horizontal [Figure 5.1].
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