PROBLEM 3. The elevation and tilt angle of table AB are controlled by an operator's hand at point D applying a horizontal force. The table supports a box of weight 100 N, with center of gravity at point G. Points A, B, C, E are pin connections. Notice that the two members EB and ACD do not touch each other. (1) (ii) (iii) Is this a truss, a frame, or a machine? Explain briefly. Are there any 2-force bodies? Explain. Draw free body diagrams of the member EB, the member ACD and of the table. (iv) Determine the horizontal force required by the operator's hand for equilibrium. (v) What are the reactions at the pin C? 30 cm- A 20 cm E 8 cm mp. B C D +30 cm 25 cm -