Determine the combined moment about O due to the weight of the mailbox and the cross member AB. The mailbox weighs 3.2 lb and the uniform cross member weighs 9.2 lb. Both weights act at the geometric centers of the respective items. The moment will be positive if counterclockwise, negative if clockwise. 1" 9" 19" 7" 9" 3.5" A 36" Answer: Mo = i 0 B lb-in.

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