The mechanism shown is used to lower handicapped persons into a whirlpool tub for therapeutic treatment. In the unloaded configuration, the weight of the boom and hanging chair induces a compressive force of 430 N in hydraulic cylinder AB. (Compressive means that the force which cylinder AB exerts on point B is directed from A towards B.) If 0 = 22°, determine the moment made by this cylinder force which acts on point B about (a) point O and (b) point C. The moments are positive if counterclockwise, negative if clockwise. 115 200 Mo= 625 Answers: Mc= 190 i i 365 160 190 925 B 165 Dimensions in millimeters N-m N•m

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