3. Find the least value of P required to cause the system of blocks shown to have impending motion to the left. Also find the normal forces on each block. The coefficient of friction under each block is 0.35 and angle alpha is 33 degrees. 30 kN 10 kN 30
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- The block of weight W is pulled by the force P inclined at the angle to the horizontal. Find the smallest force P and the corresponding angle that would cause impending sliding of the block. The angle of static friction between the block and the ground is s.A uniform plank is supported by a fixed support at A and a drum at B that rotates clockwise. The coefficients of static and kinetic friction for the two points of contact are as shown. Determine whether the plank moves from the position shown if (a) the plank is placed in position before the drum is set in motion; and (b) the plank is first placed on the support at A and then lowered onto the drum, which is already rotating.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 screw of the carjack has a pitch of 0.1 in. and a mean radius of 0.175 in. Note that the ends of the screw are threaded in opposite directions (right- and left-handed threads). The coefficient of static friction between the threads is 0.08. Calculate the torque C0 that must be applied to the screw in order to start the 1200-1b load moving (a) upward; and (b) downward.The 2225 N block shown is in contact with 45° incline. The coefficient of static friction is 0.25. Compute the value of the horizontal force P necessary to a. just start the block up the incline b. just prevent motion down the incline c. If P = 1780 N, what is the amount and direction of the friction force?5 Find the Jeast value of P that will just start the system of blocks shown moving to the left. The coefficient of friction under each block is 0,25. 300 N 100 N 30°
- 1.The figure shows 3 blocks. Block C hangs from a rope which passes through a fixed cylinder and is attached to block B. Find the maximum mass of block C so that block B does not move to the right. Take into account that there are frictional forces at all points of contact. Consider the given values of the masses and , the coefficient of static friction between surfaces µ1 and the coefficient of friction static between the cylinder and the uC chord. Here are the values: ma= 72 kg mb= 62 kg u1= 0,47 uC=0,37estion 6 The crate has a weight of 490 lb and a center of gravitY at G rests on the floor for which the coefficient of static friction is equal to 0.3. if the force P=200 lb is applied as shown in the figure below, The force of friction developed between the crate and the ground is. yet aered ered out of L00 Flar -2 ft 2 ft- 3 4 ft 3 ft Figure 1The 20-lb block has friction coefficients of μ = 0.4 and = 0.35, with the inclined surface. Find a. the angle where the 10-lb block begins to slide b. the acceleration of the block at the angle where it first slides c. the acceleration of the block at an angle 10° past the angle in b. If you use cartesian coordinates with x-along the slope, the problem is easier. B A
- 4. The 500KN block is in contact with a 45degree incline. The coefficient of static friction is 0.25. Which of the following most nearly gives the horizontal force P necessary to just prevent the motion down the incline? 1. 970KN 2. 300kN 3. 830kN 4. 640KN1. Find the least value of P required to cause the system of blacks shown to have impending motion to the left. Also find the normal forces on each block. The coefficient of friction under each block is 0.20 and angle alpha is 25 degrees. CIL 30 kN 10 kN 30A 200 lb block is in contact with a plane inclined at 30 degrees to the horizontal. A force P, parallel to and acting up the plane, is applied to the body. If the coefficient of static friction is 0.20, find: a. the value of P to just cause the motion to impend up the plane b. the value of P just to prevent motion down the plane c. the magnitude and direction of the friction force F if P= 80 lbs