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A uniform quarter circular thin rod of m...

A uniform quarter circular thin rod of mass M and radius R is pivoted at a point B on the floor. It can rotate freely in the vertical plane about B. It is supported by a smooth vertical wall at its other free end A so that it remains at rest. Find the reaction force of wall on the rod.

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The correct Answer is:
`N = (1 - (2)/(pi)) Mg`
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