Chapter 8, Problem 60P

The system consists of the two smooth spheres, each weighing 3 lb and connected by a light spring, and the two bars of negligible weight hinged freely at their ends and hanging in the vertical plane. The spheres are confined to slide in the smooth horizontal guide. If a horizontal force F = 10 lb is applied to the one bar at the position shown, what is the accelera- tion of the center C of the spring? Why does the re- sult not depend on the dimension b?

Weight of the refrigerator is 880 N. The coefficient of static friction is 0.22 for all surfaces. When the force F is removed the system is not in static equilibrium. Determine the force F to hold the wedge in position. Draw free body diagram of the wedge!! 18°

Q2/ The 5-kg collar A slides with negligible friction on the fixed vertical shaft. When the collar is released from rest at the bottom position shown, it moves up the shaft under the action of the constant force F=180 N applied to the cable. Determine the stiffness k which the spring must have if its maximum compression is to be limited to d = 70 mm. The position of the small pulley at B is fixed. Take , h = 450 mm and b = 230 mm . (Use the Work-Energy Equation).

Q2/ The 5-kg collar A slides with negligible friction on the fixed vertical shaft. When the collar is released from rest at the bottom position shown, it moves up the shaft under the action of the constant force F=180 N applied to the cable. Determine the stiffness k which the spring must have if its maximum compression is to be limited to 8 = 70 mm. The position of the small pulley at B is fixed. Take ,h = 450 mm and b = 230 mm . (Use the Work-Energy Equation). ***Good Luck ***

When the 0.05-kg body is in the position shown, the linear spring is stretched 10 mm. Determine the force P required to break contact at C. Complete so lutions for (a) including the effects of the weight and (b) neglecting the weight.

The box at B weighs 50-lb. Assume that there is enough friction to prevent slip at B. The plank weighs 25-lb. ? Determine the tension in the rope and the normal force at B. A B W D 3 ft C

Q3/ When the 0.05-kg body is in the position shown, the linear spring is stretched 10 mm. Determine the force P required to break contact at C. Complete solutions for (a) including the effects of the weight and (b) neglecting the weight, 60 mm 60 mm 40 mm www k = 1750 N/m 40 mm

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