Determine the magnitude of FA . (Figure 1) Express your answer with the appropriate units. Four coplanar forces act on a beam. The forces FB and Fc are vertical. The vector sum of the forces is zero. The magnitudes FB = 21 kN and FC = 6 kN . ? FA= Value Units Figure 1 of 1 Submit Request Answer V Part B 30 FD Determine the magnitude of FD. F Express your answer with the appropriate units. Fc ? FD = Value Units