1: Consider the force system exerted on the box as represented in Figure P6.3.1. The force system consists of ten forces with lines of action and magnitudes as listed in Table P6.3.1. Let the dimensions of the box be 12 m, 4 m, and 3 m, as shown. a. Express the forces F,..., F in terms of the unit vectors n, n, and n, shown in Figure P6.3.1. b. Find the resultant of the force system expressed in terms of n, n, and n. c. Find the moment of the force system about O (expressed in terms of n, , and n). FIGURE P6.3.1 A force system exerted on a box. F F F Fa F 10 F6 Magnitude (N) CORRENTE 18 TABLE P6.3.1 Forces, Their Magnitudes, and Lines of Action for the Force System of Figure P6.3.1 Force 25 30 10 12 26 20 25 16 A 24 O 3 12m n BO G Line of Action BA AO CB OC OG DH EO DG CD Fo D H F7 4m 3m E Fa F10