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In the figure a uniform rod of mass 'm' ...

In the figure a uniform rod of mass `'m'` and length `'l'` is hinged at one end and the other end is connected to a light vertical of spring constant `'k'` as shown in figure. The spring has extension such that rod is equilibrium when it is horizontal . The rod rotate about horizontal axis passing through end `'B'`. Neglecting friction at the hinge find `(a)` extension in the spring `(b)` the force on the rod due to hinge.

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