Determine the combined moment about O due to the weight of the mailbox and the cross member AB. The mailbox weighs 4.0 lb and the uniform cross member weighs 11.2 lb. Both weights act at the geometric centers of the respective items. The moment will be positive if counterclockwise, negative if clockwise.

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Moments

There are various practical applications of the concept of moments, like a rotation of the crank due to linear motion of the piston, the moment of inertia and its use in designing beams and columns, bending moment concept, torque, twisting moment, etc.