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3-4 Sketch a free-body diagram of each element in the figure. Compute the magnitude and direction of each force using an algebraic or vector method, as specified. F=400 N. 30 3-6 B D 1.9 m 60 60% E A 5 9 m For the beam shown, find the reactions at the supports and plot the shear-force and bending-moment diagrams. Label the diagrams properly and provide values at all key points. y 500 lbf 40 lbf/in A B C X 8 in 6 in 6 in