2 ft F D E -1.5 ft 600 lb 300 lb -3 ft -3 ft-
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- 4-32. For the structure shown, draw free-body diagrams for both the beam ABC and the link BD. The members are weight- 4-34. For the pin-connected frame shown, sketch a free-body diagram of (a) the entire frame, (b) the member AC, and (c) the member DF. Neglect the weight of the members. less. F. 45° Cable Problem 4-32 A D 4-33. A 1200 Ib load is supported by a cable that runs over a small pulley at E and is anchored to a bar DA, as shown. Sketch free-body diagrams of bars EB and DA and of the pulley. The bars are pin connected at each end. Neglect the weights of the mem- bers and the pulley. Problem 4-34 4-5. A weight Wis supported by a flexible cable and an inclined bar, as shown. The bar is pin connected at a vertical wall. Sketch the free-body diagram for the bar. Cable Cable 60° 12 Wall 1200 lb C 30° W 8' Bar - 12 8 Pin Problem 4-33 Problem 4-53-3. Determine the bar force in each member of the trusses shown in Fig. 3-35 by the method of joint. 20 kN 80 kN 30° 50 kN 1.2 m 3.6 m 1,8 m 20 kN 2.4 m 2.4 m 2 at 4.8 m = 9.6 m (b) (a) 20 kN 30 kN 5 m 30 kN 30 kN 5 m 4 m 5 m to B 2 m 3 m m 3 m 4 m 4 m (c) (d) 3 at 3 m = 9 m 2 at 6 m = 12 m |- 2 m 6 m 2 m 3 m 50 kN () 20 kN (e) Fig. 3-35 E E E6-37 A structural member is loaded and supported as shown in Fig. tion and weighs 208 lb. Determine the reactions at supports The member has a uniform cross sec- A and B. 200 lb 2 ft A 2 ft 100 lb 300 Ib -2 ft 4 ft -3 ft -
- 6-45 A rope and pulley system is used to support a body as shown in Fig. the ropes are continuous over the pulleys. Determine the force P required to hold the body in equilibrium if the weight W of the body is 400 lb. Each pulley is free to rotate, and P W3-11 Detormine the forces in cables A and B if block Wof Fig. P3-11 weighs 350 Ib.QI (5-22) : The uniform door has a weight W and a center of gravity at G. Determine the reactions at the hinges if the hinge at A supports only a horizontal reaction on the door, whereas the hinge at B exerts both horizontal and vertical reactions. Given: W := 100N a := 0.3m b:= 0.3m 4y - 33.3N c:= 0.05m By= 33.3N d:= 0.2m By = 100N
- 4-13 Two fores are applied to an angie bracket as shown in Fig. P4-13. Determine the mounents of forces F, and F2 about points A and 71. F, - 325 Ib 30 60 F =425 lb 12 in. -12 in. Fig P4-136-41 A 30-lb force P is applied to the brake pedal of an automobile as shown in Fig. applied to the brake cylinder and the reaction at support A. Determine the force Q P 30° 5 in. B 55 in. 4 in.-6-88* A bar is supported by a ball-and-socket joint, link, and cable as shown in Fig. at supports A (ball-and-socket joint) and B (link) and the Determine the reactions tension in the cable. 1000 mm 750 mm 2.5 kN 900 mm 600 mm 550 mm
- 6-23. The Fink truss supports the loads shown. Determine the force in each member and state if the members are in tension or compression. Approximate each joint as a pin. Problem 6-23 1000 lb 500 lb 2.5 ft eo ec 00 00 30° 1000 lb 2.5 ft B 80.00 GO OC H 1000 lb 2.5 ft 8000 co C 500 lb 2.5 ft G D F E 30°For Probs. 1-3, (a) draw the free-body diagrams for the entire assembly (or structure) and each of its parts. Neglect friction and the weights of the members unless specified otherwise. Be sure to indicate all relevant dimensions. For each problem, (b) determine the total number of unknown forces and the total number of independent equilibrium equations. Problem 1 500 N 500 N 1 m 500 N (b) (c) Figure 1 Problem 2 -- Ift 4 ft -1.8 ft 100 lb F1.8 ft - 100 lb 100 lb (а) (b) (c)Determine the force in each member of the truss shown in the figure below. 600 lb 600 lb 600 lb D 300 lb 300 lb 6 ft B E 6 ft Ao H C| F G -8 t- -8 ft -8 ft -8 ft- 8 ft-