|F1 B Н D G F2

Section 3.3 Moment of a Force 3.17 The four forces shown have parallel lines of action. Member AB is perpendicular to the lines of action of these forces. (a) Determine the moment of each force with respect to point A. (b) Compute the algebraic summation of the moments with respect to point A. Be sure to note the sense of the resul- tant moment. A 20 lb PROBLEM 3.17 5' 40 lb + 6' 50 lb 230 lb 2 2x2 8' B TIRSINT

2. The resultant of the three cable forces pulling on A is vertical and equal to the weight, W, of the suspended object. All three cables are in ten- sion. (They pull on the ring at A.) If the angles ß and y, as well as the weight W and forces FAB and FAc in cables AB and AC, respectively, are given, what are the force FADİN cable AD and the angle 8 in terms of given quantities? B D. A