P4-7. Determine the force P needed to cause impending motion of the block. W = 200 N Fim-
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- P4-7. Determine the force P needed to cause impending motion of the block. 1m w = 100 N EIm . = 0.4P4-6. Determine the force P to move block B. W = 100 N A,-02 W = 100 N H,- 0.2 w = 200 N 4.-0.13-38. The sling BAC is used to lift the 100-lb load with constant velocity. Determine the force in the sling and plot its value T (ordinate) as a function of its orientation 6 where 0S0S 90°. *3-40. The load has a mass of 15 kg and is lifted by the pulley system shown. Determine the force F in the cord as a function of the angle 0. Plot the function of force F versus the angle 0 for 0 s0 s 90°. 100 lb 45° Be Prob. 3-40
- Identify the zero force members (if any) in the trus P 4 m -3m3-40. The load has a mass of 15 kg and is lifted by the pulley system shown. Determine the force F in the cord as a function of the angle 0. Plot the function of force F versus the angle 0 for 0 ≤ 0 ≤ 90°.P4-4. Determine the friction force at the surface of contact. 500 N W = 200 N H = 02
- *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
- Based 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 B4-44. The tongs are used to lift the 150-kg crate, whose center of mass is at G. Determine the least coefficient of static friction at the pivot blocks so that the crate can be lifted. 275 mm 500 mm 500 mm 300 mm*4-48. The pipe of weight Wis to be pulled up the inclined plane of slope a using a force P. If Pacts at an angle d, show that for slipping P = W sin(a + 0)/cos(6 - 6), where e is the angle of static triction; 8 = tan '-