determine the largest weight of block D without causing motion.
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- The shaft has a square-threaded screw with a lead of 8 mm and a mean radius of 15 mm. If it is in contact with a plate gear having a mean radius of 30 mm, determine the resisting torque M on the plate gear which can be overcome if a torque of 7 N⋅m is applied to the shaft. The coefficient of static friction at the screw is μB =0.2. Neglect friction of the bearings located at A and B.Determine the weight of block B for the 250N block A not to slidedown in the inclined plane. Given that the coefficient of staticfriction in the 45° inclined plane is 0.25 and in the 30° inclinedplane is 0.3. (Assume frictionless pulley) Answer: WB = _____________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 clamp has a square thread of pitch 0.16 in. and a mean diameter of 0.6 in. The coefficient of static friction between the threads is 0.4. Determine (a) the torque C0 that must be applied to the screw in order to produce a 28-lb clamping force at A; and (b) the torque required to loosen the clamp.When the 100-lb block is at h = 3 ft above the cylindrical post and spring assembly, it has a speed of = 20 ft>s. If the post is made of 2014-T6 aluminum and the spring has the stiffness of k = 250 kip>in., determine therequired minimum diameter d of the post to the nearest 1/8 in. so that it will not yield when it is struck by the blockThe tractor has a weight of 13500 lb and the coefficient of rolling resistance is a = 1.9 in . Determine the force P needed to overcome rolling resistance at all four wheels and push it forward.
- The wheel is subjected to a torque of M 50 N m. If the coefficient of kinetic friction between the band brake and the wheel rim is equal to 0.3, determine the smallest horizontal force P that must be applied to the lever to stop the wheel.The wheel is subjected to a torque of M = 50 N If the coefficient of 0 kinetic friction between the band and brake and the rim of the wheel is 4k=0.3, determine the smallest horizontal force P that must be applied to the lever to stop the wheel.The driver of the sports car applies his rear brakes and causes the tires to slip. If the normal force on each rear tire is 1800lb and the coefficient of kinetic friction between the tires and the pavement is { { \mu }_{ k }=0.5 }μk=0.5, determine the average shear stress developed by the friction force on the tires. Assume the rubber of the tires is flexible and each tire is filled with an air pressure of 225 kp.
- If spring is found to extend 20mm for each 2kg of mass, the defelaction of spring carrying a mass of 10kg is A)200mm B)1m C)0.1m D)10mThe block brake is used to prevent the wheel from rotating when it is subjected to a torque moment M0. If the coefficient of static friction between the wheel and the block is us, determine the minimum force P that must be applied.A 60-kg cabinet is mounted on casters that can be locked to prevent their rotation. The coefficient of static friction between the floor and each caster is 0.35. 3. If h = 600 mm, determine the magnitude of the force P (in N) required to move the cabinet to the right if the casters at A are locked and the casters at B are free to rotate. (ANSWER: 72.5)