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The body in figure shown is pivoted at O...

The body in figure shown is pivoted at O and two forces acts on it as shown

(i) Find an expression of the net torque on the body about the pivot
(ii) If `r_(1)=1.30 m,r_(2)=2.15 m,F_(1)=4.20N,F_(2)=4.90 N,theta_(1)=75^(@)` and `theta_(2) = 60^(@)`, what is the net torque about the pivot ?

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