A Light Triangular Plate OAB Is in a Horizontal Plane

question 40

Multiple Choice

A light triangular plate OAB is in a horizontal plane.Three forces, and act on the plate,which is pivoted about a vertical axes through point O.In the figure, ₂ is perpendicular to OB.Consider the counterclockwise sense as positive.The sum of the torques about the vertical axis through point O,acting on the plate due to forces F₁,F₂,and F₃,is closest to

• A) 4.1 N • m.
• B) 5.4 N • m.
• C) -4.1 N • m.
• D) -5.4 N • m.
• E) zero

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