(2) Starting from a support joint, use method of joints to determine the forces in members BC, CH, and GH of the loaded truss. Ans: BC= 75 kN C, CH=48.0 KN C, GH = 112.5 kN T B 4 m D E 5 m 5 m 5 m 5 m A H G F 30 kN 60 kN 30 kN

In this assignment, start from a loaded joint and use the method of joints to calculate the truss member forces. (1) Determine the force in each member of the loaded truss. Ans: AB 900 lb T, AC = 780 lb C, BC = 720 lb T 20 in. 16 in. B 15 in.- 240 lb

(6) A force of 200 N is applied perpendicular to the wrench at its tip as shown. Determine the equivalent force-couple system at center O of the wheel. Ans: F=68.4-187.9 N, Mo = 78.3 N'm CW 650 mm 125 mm 450 mm 20° 200 N

(5) The compound pliers consist of four members: two handles and two jaws pin- connected symmetrically as shown. For the applied forces P = 100 lb, determine the normal gripping force on the jaw at Q. Ans: 62.9 lb B D -3.5"- 1" 2.5"- 5.5"

(4) The 1800 kg uniform square plate is suspended by three cables as shown and remains horizontal. Determine the tension in each cable. Ans: TA=TB 5.41 kN, Tc = 9.87 kN 2400 mm C 1200 mm ak A 2400 mm B 1200 mm 1200 mm

Determine the force in each member of the Gambrel roof truss shown. State whether each member is in tension or compression. Use Method of Sections. The answers are AB = 5 kN C, AC = 4 kN T, BC = 0, CE = 4 kN T, BE = 0.2 kN C, BD = 4 kN C, FH = 5 kN C, HG = 4 kN T, EG = 4 kN T, FG = 0, DF = 4 kN C, EF = 0.2 kN C, DE = 0.24 kN T

A rod AB, hinged at A and at- tached at B to cable BD, supports the loads shown. Knowing that d = 200 mm, determine (a) the tension in cable BD, (b) the re- action at A. A 90 N D 90 N -100 mm-100 mm-1 mm-100 mm 100 mm

(6) The 180 lb uniform rectangular plate is suspended by three vertical cables as shown so that the plate remains in the horizontal position. Compute the tension in each cable. Ans: T₁ =70 lb, TB = 20 lb, Tc = 90 lb 15 in. 45 in. B 15 in. 50 in. 45 in.

Eighteen foot-pounds of work is required to stretch a spring 4 inches from its natural length. Find the work required to stretch the spring an additional 3 inches.Use Hooke's Law to determine the variable force in the spring problem. Work done

A force of 7 pounds compresses a 15-inch spring a total of 3 inches. How much work is done in compressing the spring 9 inches? Use Hooke's Law to determine the variable force. Work done: ft-lb