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(Solved): (a) Calculate the moment of the \( 90-\mathrm{N} \) force about point \( \mathrm{O} \) for the con ...
(a) Calculate the moment of the \( 90-\mathrm{N} \) force about point \( \mathrm{O} \) for the condition \( \theta=90^{\circ} \). Also, determine the value of \( \theta \) for which the moment about \( \mathrm{O} \) is (b) zero and (c) a maximum.