120 Rigid Bodies: Equivalent Systems of Forces 3.74 Two parallel 40-N forces are applied to a lever as shown. Deter- mine the moment of the couple formed by the two forces (a) by resolving each force into horizontal and vertical components and adding the moments of the two resulting couples, (b) by using the perpendicular distance between the two forces, (e) by summing the moments of the two forces about point A. 20 40 N The tw hafts of a sneed.reducer unit are suhiected to couples mag -15 ID ad M It, respectiv y. Ppace couples with ale uivalent couple, specif ats mag- .ude and the dire 40 N 270 mm its axis. 55° 390 mm A O

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