A flag pole is held in the ground with a pair of steel cables (see Figure 5.3). The forces acting along the cables AB and AC are shown in the figure as arrows with their corresponding magnitudes. (1) Find the equation of the plane passing through A, B & C (ii) Express the force FAV400 N (Figure 5.3) acting perpendicular formed by the points ABC at point O as a cartesian vector. (iii) Find the moment of the forces F and Fc about O. [4 marks] to the plane [2 marks] [7 marks] F = 400N 10m 2m 3 m 600N Figure 5.3 761 Fc = 400N 6m B