ES2501: Introduction to Static Systems (2004E) Quiz #5 Name:__________ A truss is pin-supported at points A1 and B1 and subjected to an end load, P, at point B7, as shown. Assume that each section, say, A2B2B3A3, is a square of side of a. Note that all nodes are pin-connecter, Free-body diagrams are required in your answers. 1. (5 pts) Identify all zero-force bars in the truss. Note that the internal force of a zero-force bar is zero. There are five zero-force bars: A2B2, A2B2, A2B2, A2B2, and A2B. 2. (15pts) Find the internal forces of bars B3B4, A3A4 and A3B4, respectively. Indicate id they are tension or compression, Verification: 3. (10pts) Find the internal force of bars B4B5 and B4A5, respectively.