Question

1. (-/25 Points) DETAILS NORENGSTATICS1 6.P.021. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER For the truss loaded as shown, determine the member forces in BC, CF, and FG in kilonewtons. Use the method of sections. (Due to the nature of this problem, do not use rounded intermediate values in your calculations- including answers submitted in WebAssign.) ,7 kN 2 kN 25 kN 2 KN 4m DUN H F G 3@3m=9m magnitude 2 sense --Select- FCF magnitude KN sense -Select- FEG magnitude KN sense -Select- Also, identify all zero force members in the truss. (Enter your answers as a comma-separated list.)

Answer 1

Soleen KN 1 25KNA B С. 2 KN 4m H 3m ८ 3m 3m HE 7711 TA {fo=o HE = 25+2= 27KN taking moment about 25*4 + 7x3 + 2x6 = VHx9 1 = 14,778 KN Efy=0 VET 7+2=VH IVE = 5.778 KN method of section a section xx' in two parts by Cutting the frame member passing thorough BC, CF FG 2 KN 7KN foc 25kN BJ A 1 » 2KN Рас K 4m 4m H •FFG 4 3m 3m F FFG E HE Tun HE taking moment about F YEx3 25x4 + FBC x 4 25x4 + Focx 4 = 5.778x3 FBC = -20.6665 KN taking moment about a frax 4 = 4 x3 ffa = 14.77883/4 FFG = 11.0835KN

for left half part Efoc=0 25+ FBc & fic Cosa & ffG THE 25+ (-20.6665) + ffc* 4 11.0835= 27 (ffc = 19.30.5kn theas Fact 20.6665 kn FFG = 11.0835 kr ff c= 19.305 ko (Compression) (Tensile) (Tensile)

toults are zero force members in the CG & DH & AE