To use the method of joints to solve for the forces in a truss. The truss shown in (Figure 1) is subjected to a force PPP = 240 NN and has dimensions L1 = 1.8 mm and L2 = 3.6 mm .   Part A Part complete Since all of the joints have more than two unknowns, begin by finding a support reaction. What is the vertical reaction at C? Let a positive force act up. Express your answer to three significant figures with appropriate units.   Part B Part complete Now joint CC has two unknowns. Use the equilibrium of joint CC to calculate the force in CDCD. Use a negative sign to indicate compression. Express your answer to three significant figures with appropriate units.   Part C Part complete Use the equilibrium of joint CC to calculate the force in BCBC. Use a negative sign to indicate compression. Express your answer to three significant figures with appropriate units.   Part D Part complete Use the equilibrium of joint B to calculate the force in BD. Use a negative sign to indicate compression. Express your answer to three significant figures with appropriate units.   Part E Part complete Use the equilibrium of joint B to calculate the force in AB. Use a negative sign to indicate compression. Express your answer to three significant figures with appropriate units.   Part F Use the equilibrium of joint D to calculate the force in AD. Use a negative sign to indicate compression. Express your answer to three significant figures with appropriate units.

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Equilibrium and Support Reactions

Civil engineers deal with structures that are composed of several members connected or with individual members such as beams and columns. To analyze such structures, the condition of statics must be applied. Under the static condition, the members are considered to be in equilibrium under the action of forces, that is, the members are assumed to be having negligible velocity.