Exercise 3.31 The forces exerted on the shoes and back of the 72-kg climber by the walls of the "chimney" are perpendicular to the walls exerting them. The tension in the rope is 640 N. What is the magnitude of the force exerted on his back?
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- The tongs shown are designed for lifting blocks of ice. If the weight of the ice block is W, find the horizontal force between the tongs and the ice block at C and D. Neglect the weights of the tongs.Two painters stand on a 10.0m long plank of mass 300 kg. The plank rests on two pillars separated by 6.00m. Danny has a mass of 92.0 kg and stands 3.00m from the left end of the plank and Jerry has a mass of 68.0 kg and stands 1.50m from Danny. Assume that the plank is not nailed to the pillars (the plank only rests on top of pillars). Determine the force which the left pillar exerts on the plank. Determine the force which the left pillar exerts on the plank. Determine the force which the left pillar exerts on the plank.o
- The input piston and output plunger of a hydraulic car lift are at the same level, as shown in the drawing. The cross-sectional area of the input piston is 12 cm2, while that of the output plunger is 1200 cm2. The force F1 applied to the input piston has a magnitude of 160 N. What is the weight W of the car? Neglect the weight of the piston and plungerQ3) A lug wrench is used to tighten a square-head bolt. If 50-lb forces are applied to the wrench as shown, determine the magnitude F of the equal forces exerted on the four contact points on the 1-in. bolt head so that their external effect on the bolt is equivalent to that of the two 50-lb forces. Assume that the forces are perpendicular to the flats of the bolt head. 1"- A 50 lb A C View C Detail (clearances exaggerated) 14" 50 lb 14"45 N Ans. (a) 34 N, 0=280 (b) dRA = 11.64 mm from B to the left; dRc3D62 mm below B 36 Dr. M.S. Meddah 3.116 A 160-N motor is mounted on the floor. Find the resultant of the weight and the forces exerted on the belt, and determine where the line of action of the resultant intersects the floor. 700 N 30° 50 mm -300 N 50 mm Final result: Resultant, R = 925.92 N and 0 = 11.840 x= -582.22 mm i.e. resultant intersects the floor 582.22 mm to the left of the vertical centerline through O. 37
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