statics

Question: A uniform beam of length 2a rests in equilibrium against a smooth vertical plane and over a smooth peg at a distance h from the plane. If $\theta$ be the inclination of the beam to the vertical, then $\sin 3\theta$ is

1) $\frac{h}{a}$

2) $\frac{{{h}^{2}}}{{{a}^{2}}}$

3) $\frac{a}{h}$

4) $\frac{{{a}^{2}}}{{{h}^{2}}}$

Solution:

Explanation: No Explanation

Equilibrium of co-planar forces

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