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State the principle of moments....

State the principle of moments.

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The algebric sum of clockwise and anticlockwise moments about a point is equal to zero for a mechanical equilibrium
CW moment `=-F_2OB`
ACW moment`=+F_1OA`
Moment of R about O=0
Hence `+F_1AO-F_2OB=0`
i.e `(F_1)/(F_2)=(OB)/(OA)`
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