The rack for storing automobile wheels consists of two parallel rods A and B. Determine the magnitude of the force P required to begin extracting the wheel. The mass of the wheel is m. Neglect all friction. m 26° 67° B 39°
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- The rack for storing automobile wheels consists of two parallel rods A and B. Determine the magnitude of the force P required to begin extracting the wheel. The mass of the wheel is m. Neglect all friction. m 26° 67° B 39°A bicyclist applies a 40-N force to the brake lever of her bicycle as shown. Determine the corresponding magnitude of tension force T transmitted to the brake cable. Neglect friction at the pivot O. Express your answer in units of N. 19 mm- T 88 mm 40 NThe 15-lb bar BC is connected to a disk centered at A, and to a bar DC. If the disk is made to rotate at a constant speed of 180 rpm, determine the vertical components of the force exerted on bar BC at B and at C.
- Q3 / The indicated location of the center of mass of the 1600-kg pickup truck is for the unladen condition. If a load whose center of mass is x = 400 mm behind the rear axle is added to the truck, determine the mass m, for which the normal forces under the front and rear wheels are equal. WL 1125 1675 mm mmThe uniform pole of length l and mass m is placed against the supporting surfaces shown. If the coeffi- cient of static friction is u, = 0.25 at both A and B, determine the maximum angle 0 at which the pole can be placed before it begins to slip. A 105° В 2.The homogeneous bar AB weighs 25 lb. Determine the magnitudes of the forces acting on the bar at A and B. Neglect friction.
- End B of the uniform 2.7-kg bar AB is connected to a small roller that moves in a horizontal slot. The other end of the bar is pinned to the homogeneous 1.8-kg disk that rolls without slipping on the vertical surface. The spring attached to A has a free length of 0.3 m and a stiffness of 58 N/m. After the system is becomes horizontal. Determine the magnitude of the force P that acts on the bar at B. 2.1 m 0.24 m 0.9 m www 1.8 kg 1.5 m 2.7 kg PThe hoist consists of a single rope and an arrangement of frictionless pulleys as shown. If the angle 0 = 33°, determine the force that must be applied to the rope, Frope, to lift a load of 4.7 kN. The three- pulley and hook assembly at the center of the system has a mass of 28.5 kg with a center of mass that lies on the line of action of the force applied to the hook. cc 130 BY NC SA 2013 Michael Swanbom Note the figure may not be to scale. Frope KN B A Fhook FropeGo 0.3 m---0.2 m- 0.2 m 0.4 m 60° 0.5 m The hand truck has a mass of 198 kg and a center of mass at G. Determine the maximum magnitude of the force P (in kN) that can be applied to the crank so that wheels A or B remain in contact with the ground. . Neglect the mass of the wheels.
- Q3 / The indicated location of the center of mass of the 1600-kg pickup truck is for the unladen condition. If a load whose center of mass is x = 400 mm behind the rear axle is added to the truck, determine the mass m, for which the normal forces under the front and rear wheels are equal. |B 1125 1675 mm mmThe uniform 20-lb ladder rests on the rough floor forwhich the coefficient of static friction is s = 0.45 andagainst the smooth wall at B. Determine the horizontalforce P the man must exert on the ladder in order tocause it to move. Answer: P = _____________2. The two 200-lb blocks are pushed apart by the 15° wedge of negligible weight. The angle of static friction is 12° at ali contact surfaces. Determine the force P required to start the blocks moving. 1515 200 lb 200 lb