Determine the force P required to force the 16° wedge under the 99-kg uniform crate which rests against the small stop at A. The coefficient of friction for all surfaces is 0.47. 4° 16° Answer: P = i 1.5 m 99 kg 0.7 m A 16° N
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- A wedge is used to prop up the 6000-lb block of marble. The wedge angle is =30, and the angle of static friction is s=12 between all contact surfaces. Determine the smallest force P that would prevent the wedge from sliding out.The leather rein used to fasten the horse to the hitching rail weighs 3.5 oz per foot. The coefficient of static friction between the rail and the rein is 0.6. If a 34-lb force acting on the bridle is sufficient to restrain the horse, determine the smallest safe length L for the free end of the rein.The 600-lb cable spool is placed on a frictionless spindle that has been driven into the ground. If the force required to start the spool rotating is F = 160 lb, determine the coefficient of friction between the ground and the spool. Neglect the diameter of the spindle compared to the diameter of the spool.
- The normal pressure acting on the disk of the sander is given by p=(4/3)+(r2/6), where p is the pressure in pounds per square inch (psi) and r represents the radial distance in inches. Determine the torque C required to operate the sander at constant speed if the kinetic coefficient of friction for the surface being sanded is 0.86.The end A of the beam needs to be raised slightly to make it level. If the coefficient of static friction of the contact surfaces of the wedge is 0.2, determine the smallest value of the horizontal force P that will raise end A. The weight and size of the wedge are negligible. 250 N/m 10° 3 mThe coefficient of friction between 200 Ib homogeneous cylinder and the horizontal plane is 0.4 as shown in figure. The vertical plane is smooth. Determine the frictional force exerted on the cylinder by the horizontal surface. 40ft-lb
- Two identical wood blocks with weight W are being pushed apart by a wedge. The coefficient of static friction for all surfaces is 0.325. Determine the weight of the wedge, P, required to start the blocks moving. The wedge is symmetrical about the vertical, and 0 = 24°. Use the triangle method or the component method. urgenttt thank youTwo blocks with masses ma = P kg and mg = 100 kg are connected with a flexible cable that passes over a frictionless pulley as shown in Fig. The coefficient of friction between the blocks is 0.2. If motion of the blocks is impending, determine the coefficient of friction between block B and the inclined surface and the tension in the cable between the two %3D blocks. the force for P is 78kg A B 40°The 81-lb force Pis applied to the 190-lb crate, which is stationary before the force is applied. Determine the magnitude and direction of the friction force Fexerted by the horizontal surface on the crate. The friction force is positive if to the right, negative if to the left. Assume 4, = 0.41, Hx = 0.33. Answer: F= i 77.9 Ib
- P (N) * 2. The force P is applied to the block m kg, which is stationary before the force is applied. Determine the magnitude and direction of the friction force f exerted by the horizontal surface on the block. m kg 30° H = 0.80 H = 0.60 %3D Figure 2. 25 kg m = .... ..... .... .. P = 245.25 newton ....... ..... .......A uniform ladder of length 3.25 m and weighing 250 N is placed Against a smooth vertical wall with its lower end 1.25 m from theWall. The coefficient of friction between the ladder and floor is0.3. The frictional force acting on the ladder at the point of contactWith floor is O 70 O 68 O 65 O 79 O 75 N.A 40- kg block is placed on the uniform 10-kg beam, that is supported by the cable, which is attached to the end of the beam. The cable wraps around the pulley, and the cable is connected to the block. If the coefficient of the static friction between the block and the beam is u,-0.6. Neglecting friction forces in the pulley. Determine the maximum distance that the block can be placed from 0 and still remain in eqilibrium. Assume the block will not flip. Distanc Fig. (6) m B Pulley 30 cm