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answers have units! ID 3. 135 points] A 3000-N truck motor is suspended from the entry shown in Figure 3a. Neglect the self-weight of everything but the motor. All member connections are frictionless pins. a) Could the gantry be classified as a truss? Why or why not? b) Compute all forces acting on Member ABC and show them on a sketch in the answer box. Fully labeled FBD(s) are required for full credit c) is this gantry safe or unsafe? Explain d) The cross-section of Member ABC is shown in Figure 3. Compute it's Moment of inertia about its centrodai-axis, I shown in the figure. (Note: the moment of inertia of a rectangle about its centroid is bh /12). Figure 3a 2 m im -2 cm 7.67 cm 8 cm 433 cm 7 cm 1 cm 15 cm Figure 36 a) Truss? Yes - O- No circle one b) OR 39 co c) Safe Uncafe circle one d) her