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Problem 4: Consider the 12-m-long truss below. The boundary condition at H is a pin. The boundary conditions at I, J, and K are rollers. (a) This truss has how many unknown reaction forces, member forces, and equations of equilibrium? Is the truss statically determinate? If not,what is the degree of indeterminacy? (b) Calculate the axial force in member DE. Hint: using the method of sections, cut the structure through members DE, DK, CK, and JK, then sum the moments about point K. (c) Similarly, calculate the axial force in members EF and FG.

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