3-15. The unstretched length of spring AB is 3 m. If the block is held in the equilibrium position shown, determine the mass of the block at D. - 4 m- 3 m- B. C- kAC = 20 N/m ww 3 m kAB = 30 N/m kAD = 40 N/m De Probs. 3-14/15
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- *3-16. Determine the stretch of each spring for equilibrium of the 20-kg cylinder. Problem 3-16 Ja KAD=400 N/m KAB = 300 N/m KAC = 200 N/m 3 m 4 m 3 m3-21. The 10-lb weight is supported by the cord AC and roller and by the spring. If the spring has an unstretched length of 8 in., and the weight is in equilibrium when d = 4 in , determine the stiffness k of the spring. Problems 3-20/21 A 12 in. B3-23. Determine the unstretched length of spring AC if a force P 80 lb causes the angle 6 60° for equilibrium. Cord AB is 2 ft long. Take k 50 lb/ft. 2 ft 2 ft C B
- 3-14. Determine the stretch in each spring for equilibrium of the 2-kg block. The springs are shown in the equilibrium position. 3-15. The unstretched length of spring AB is 3 m. If the block is held in the equilibrium position shown, determine the mass of the block at D. 4 m- 3 m B C- www kAB = 30 N/m kẠC = 20 N/m %3D 3 m kAD = 40 N/m %3D Do Probs. 3-14/15 www wwwBased on Problem 5-87 from the textbook. Both pulleys are fixed to the shaft and as the shaft turns with constant angular velocity, the power of pulley A is tramsitted to pulley B. Determine the horizontal tension T in the belt on pulley B and the x, y, z components of reaciotn at the journal bearing C and thrust bearing D. The bearings are in proper alignment and exrt only force reactions on the shaft. F₁ = 70 N F2=80 N Unique Values for F 300 mm F3 = 40 N 8= 44 44° 250 mm 200 mm F₁ F2 80 mm A 150 mm B1 m aile Prob. 5-82 ket Inthree di 5-83. Both pulleys are fixed to the shaft and as the shaft turns with constant angular velocity, the power of pulley A is transmitted to pulley B. Determine the horizontal tension T in the belt on pulley B and the x, y, z components of t reaction at the journal bearing C and thrust bearing D if A = 0°.The bearings are in proper alignment and exert only force reactions on the shaft. determine the me each force The Theix established 200 mm 50 N 250 mm LD 300 mm -150 mm B. EGO 80 mm 65 N 80 N Prob. 5-83
- •3-41. A continuous cable of total length 4 m is wrapped around the small pulleys at A, B, C, and D. If each spring is stretched 300 mm, determine the mass m of each block. Neglect the weight of the pulleys and cords. The springs are unstretched when d = 2 m. k = 500 N/m D k = 500 N/mC4-5. The tie rod is used to support this overhang at the entrance of a building. If it is pin connected to the building wall at A and to the center of the overhang B, determine if the force in the rod will increase, decrease, or remain the same if (a) the support at A is moved to a lower position D, and (b) the support at B is moved to the outer position C. Explain your answer with an equilibrium analysis, using dimensions and loads. Assume the overhang is pin supported from the building wall.3-67. Three 10-lb balls and one 15-lb ball are suspended from the pulley-and-cable system. If the pulleys are frictionless and the centers of all of them lie in the same horizontal plane, determine the sag s for equilibrium of the system. 10 lb 20 in. 20 in. 10 lb 15 lb 20 in. 10 lb
- P4-6. Determine the force P to move block B. W = 100 N A,-02 W = 100 N H,- 0.2 w = 200 N 4.-0.13-37. A 4-kg sphere rests on the smooth parabolic surface. Determine the normal force it exerts on the surface and the mass me of block B needed to hold it in the equilibrium position. Problem 3-37 0.4 m A -0.4 m- 60° y = 2.5x² B XIn figure shown, the unstretched length of spring AC is 3 m. If the block is held in the equilibrium position, determine the mass of the block at D. 3 m- 4m- KAc=20 N/m 3m KAB=40 N/m KAD=30 N/m