Determine the magnitude of the moment about the OA axis

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Determine the magnitude of the moment of the
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remember to indicate that the M of OA is 72 N*m in the clockwise direction when getting rid of the negative in the answer.

circleofthytyrants
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-200 × -0.2 × 0.6 = 24

Shouldn't it be positive (- × - = +) ?
Making the final answers
Moa= -24?

rtharmon
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why do we choose vector AB x vector F, instead of choosing vector OB x vector F?

celinewong
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How come you didn't cross AB with F, then multiply the result by Uoa?

stepshred