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FEESANC RM No 6 ; Fá | lhe entire frame; (b) the 6.73 The force F = 10 kN. Determine the forces on memt pe the forces and cou- ABC, presenting your answers as shown in Fig. 6.35. freesb Ea A: 6.77 Determine the forces on member BC and the axial force in 6.80 The mass m = 120 kg. Deine the member AC. ABC, presenting your answers as sf in Fig. | , [300 mm +—s00 mm— P6.77 ms | '$ P6.70 + 200 mnt-200m 6.78 A football player works out with a squat thrust machine, To rotate the bar ABD, he must exert a vertical force at A such that the axial force in the two-force member BC is 400 Ib. When bar ABD is on the verge of rotating, what are the reactions on member CDE? 6.81 The tension in cable BD is Sb: Dete at A for cases (1) and (2). Je on member AB for 6.74 Consider the frame in Problem 6.73. The cable CE wi is the same about any safely support a tension of 10 kN. Based on this criterion, wl - he same in cases (1) — the largest downward force F that can be applied to the frame? pt —— 21 —] 6.75 The hydraulic actuator BD exerts a 6-kN force on membe ABC. The force is parallel to BD, and the actuator is in compre sion. Determine the forces on member ABC, presenting answers as shown in Fig. 6.35. qa LtSin. E t fas | | | SftSin. | | | , P6.71 t P6.78 05m—| | tions at the built-in ps Barp, - 8.79 “The frame supports a 1-kN load, Determine the forces on 6.76 The simple hydraulic jack shown in Problem 6.7: member CDE. designed to exert a vertical force at point C. The hydraulic act Jem BD exerts a force on the beam ABC that is parallel to BD largest lifting force the jack can exert is limited by the pin A, which will safely support a force of magnitude 20 kN. the largest lifting force the jack can exert at C, and what R resulting axial force in the hydraulic actuator? , —ãos 6,135 Fc in member 6.136 Th forces in 1 600 1 6137 Fo) forces in m Pave the), Malveso 323 134 Determine the axial forces in members BD, CD, and DE 6.139 The Howe truss helps support a roof. Model the supports b atA and G as roller supports. Use the method of joints to determine the axial forces in members BC, CD. CI, and CJ. 6KN =2m-="2m-=«-2m-=-2m-"=-2m-=+—2m— P6.139 P6.134 6.140 For the roof truss in Problem 6.139, use the method of sec- tíons to determine the axial forces in members CD, CJ, and 1). truss in Problem 6.134, determine the axial forces EF, and FG 6.141 A speaker system is suspended from the truss by cables attached at D and E. The mass of the speaker system is 130 kg, and ss supports a 400-N load at G. Determine the à ; es supports 00 N Joni ato. Deterininee esoaontasisaiO. Determine he axial forces in members BC and bers AC, CD, and CF cp. 400 N 0.5m 0.5m/0.5m G ED im U 300 mm H 300 mm "300 mm 300 mm”. P6.136 nsider the truss in Problem 6.136. Determine the axial ers CE, EF, and EH. ider the truss in Problem 6.136. Which members ESA est tensile and compressive forces, and what are their 6.142 Consider the system described in Problem 6.141. If each member of the truss will safely support a tensile force of 5 kN and a compressive force of 3 KN, what is the maximum safe value of 
