Determine the minimum coefficient of static
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- The square-threaded screw with a pitch of 10 mm and a mean radius of 18 mm drives a gear that has a mean radius of 75 mm. The static and kinetic coefficients of friction between the gear and the screw are 0.12 and 0.06, respectively. The input torque applied to the screw is C0=10Nm. Assuming constant speed operation, determine the output torque C1 acting on the gear.The coeffient of static friction between the uniform bar AB of weight W and the ground is 0.45. Find the smallest angle and the corresponding force P that would initiate simultaneous tipping and sliding of the bar.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.
- 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 test specimen AB is placed in the grip of a tension-testing machine and secured with a wedge. The coefficient of static friction at both surfaces of the specimen is s. If the wedge angle is =18, determine the smallest s for which the grip is self-locking (no slipping takes place regardless of the magnitude of the force P). Neglect the weight of the wedge.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 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 0.35. If the force P = 300 lb is applied as shown in the figure below. The static friction force developed between the crate and the ground is. -2 ft. 2 ft -2 ft- 2 ft 4 ft 3 ft A Figure 1 Select one: O a. 234.5-Ib O b. 300-lb O c. 240-lb O d. 610 lb 3.The small roller on the upper end of the uniform rod rests against the vertical surface at A while the rounded end B rests on the platform which is slowly pivoted downward beginning at the horizontal position shown. For a coefficient of static friction , 0.37 at B, determine the angle of the platform at which slipping will occur. Neglect the size and friction of the roller and the small thickness of the platform. Assume = 28° Answer: 8- L H₁ BPROBLEM 1 -s- 10 ft c platform C B ramp 45⁰ 4 ft Data: The box a point A has a weight of 80 lbf. The box at A has an initial speed of 8 ft/sec. The ramp has a coefficient of friction of mamp = 0.1 and the angle of inclination of the ramp is 45 degrees. The platform has a coefficient of friction of mplatform = 0.25. The platform is anchored to the floor (it does not move). Calculate: a. The energy loss between points A and B. b. The speed at the bottom of the ramp (point B). c. What distance does the box travel along the platform and how much energy is lost between points B and C.
- Two blocks A and B have a weight of 50 N and 40 N, respectively. They are resting on the incline for which the coefficients of static friction are uA = 0.15 and µB = 0.25. The spring has a stiffness of 30 N/m and is originally unstretched. (Figure 1) Determine the angle 0 which will cause motion of one of the blocks, Express your answer in degrees to three significant figures. vec ? Submit Previous Answers Request Answer X Incorrect; Try Again; 5 attempts remaining Figure 1 of 1 Part B What is the friction force under block A when this occurs? Express your answer to three significant figures and include the appropriate units. k HA ? wwwww FA = Value Submit Previous Answers Request Answer X Incorrect; Try Again; 5 attempts remainingCalculate the horizontal force Pon the light 11° wedge necessary to initiate movement of the 36-kg cylinder. The coefficient of static friction for both pairs of contacting surfaces is 0.40. Also determine the friction force Fg at point B. (Caution: Check carefully your assumption of where slipping occurs.) 36 kg A B P > 119 Answers: P = 108 N FB = i 27.1 NThe coefficient of static friction under the block a and b are the same. If the block is in the verge of sliding, find the tension at each chord. Assume that the pulley is frictionless.Recall [from Physics]:?? = ???Where:?? - is the frictional force?? - is the normal force? -coefficient of static frictiona. Determine the tensile force (lb) on the cable 1.b. Determine the tensile force (lb) on the cable 2. Plsss show complete handwritten solution. Thanksss!!