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A uniform wire has been bent in shape of...

A uniform wire has been bent in shape of a semi circle. The semicircle is suspended about a horizontal axis passing through one of its ends, so that the semicircular wire can swing in vertical plane. Find the angle `alpha` that the diameter of the semicircle makes with vertical in equilibrium.

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The correct Answer is:
`alpha = tan^(-1) ((2)/(pi))`
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