PEARSON ETEXT ENGINEERING MECH & STATS
15th Edition
ISBN: 9780137514724
Author: HIBBELER
Publisher: PEARSON
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The clamp exerts a 145 lb compressive force on the wood blocks. Single-threaded screw BC has lead L = 0.190 in. and mean diameter d
= 0.370 in. It turns in the threaded sleeve at C and pushes against B. The coefficient of static
friction between the screw threads and the threaded sleeve is
= 0.300. Neglect friction at B.
2 in.
2 in.
2 in.
B
2.25 in.
2.40 in.
2.25 in.
(a) Determine the value of the moment M in ft · Ib to increase the clamping force. (Enter the magnitude.)
ft · Ib
(b) Determine the value of the moment M in ft · Ib to decrease the clamping force. (Enter the magnitude.)
ft · Ib
The hand clamp is constructed using a square-threaded screw having a mean diameter of
36 mm, a lead of 4 mm, and a coefficient of static friction at the screw of μ = 0.3. To tighten
the screw, a force of F = 20N is applied perpendicular to the handle. Determine the clamping
force in the board AB.
50 mm
F
F
A
B
The hand clamp is constructed using a square-threaded screw having a mean diameter of
36 mm, a lead of 4 mm, and a coefficient of static friction at the screw of us = 0.3. If the
clamping force in the board AB is 300 N, determine the reversed force −F that must be applied
perpendicular to the handle in order to loosen the screw.
50 mm
F
A
B
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- 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.arrow_forwardThe two homogeneous bars AB and BC are connected with a pin at B and placed between rough vertical walls. If the coefficient of static friction between each bar and the wall is 0.25, determine the largest angle 6 for which the assembly will remain at rest.arrow_forwardThe single-threaded screw of the floor jack has a pitch of 0.5 in. and a mean radius of 1.75 in. The angle of static friction is 8.5. (a) Determine the couple C that must be applied to the screw to start lifting a weight of 4000 lb. (b) What is the couple required to start lowering the weight?arrow_forward
- 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.arrow_forwardThe single-plate clutch transmits the torque C from the input shaft on the left to the output shaft on the right. Compression springs between the clutch housing and the pressure plate provide the necessary pressure on the friction surface. The splines prevent the clutch plate from rotating relative to the output shaft. If Ri=4 in. and R0=9 in., determine the total force that must be applied to the pressure plate by the springs if the clutch is to transmit a torque of C=56lbft when it is new.arrow_forward3. The pulley has a radius of 3". And fits loosely on the 0.5" diameter shaft. If the loadings acting on the belt cause the pulley to rotate with constant angular velocity, determine the frictional force between the shaft and the pulley and compute the coefficient of kinetic friction. The pulley weighs 18lbs 3 in. 5 lb 5.5 lbarrow_forward
- The high strength, square-threaded bolt that holds the three plates together has a nominal diameter of 1 in. The coefficient of friction is us = 0.36. The mean diameter of the thread is 0.94 in. The lead of the bolt is L = 0.160 in. Neglect friction between the nut and the washer. Determine the torque one must apply in in. Ib to the nut to induce a tension of 47,500 lb. (Enter the magnitude.) in. · Ib When that tension is achieved, determine the torque in in. · Ib required to loosen the bolt. (Enter the magnitude.) in. • Ibarrow_forwardDetermine whether the block shown below is in equilibrium, and find the magnitude and direction of the friction force. Draw the Free-body diagram and show all calculations. Given: coefficient of static friction u, = 0.30 and coefficient of kinetic friction u = 0.25. H=0.30 600N H=0.25 700N 30arrow_forwardThe light bar is used to support the 50-kg block in its vertical guides. If the coefficient of static friction is 0.30 at the upper end of the bar and 0.40 at the lower end of the bar, find the friction force acting at each end for x = 75 mm. Also find the maximum value of x for which the bar will not slip 50 kg A 300 mmarrow_forward
- Could you go step by step on how to solve this problem. I've been tackling it for the past few hours and I can't seem to get it quite right.arrow_forwardM. 0.3 m The block brake is used to stop the wheel from rotating when the wheel is subjected to a couple moment. Determine the smallest force P that should be applied as well as the magnitude of the corresponding reaction force at support C. Use the couple moment Mo = 430 N-m, the coefficient of static friction between the wheel and the block of 0.6, a = 1.8 m, b = 0.8 m, and c = 0.075m. Round all answers to the nearest integer. The smallest force P that should be applied is: N. The magnitude of the reaction force at support C is: N.arrow_forwardThe rope running over two fixed cylinders carries the 4-kg mass at one end. Determine the force P that must be applied to the other end to initiate motion. The coefficient of static friction between the rope and the cylinders is 0.15. BISECTION METHODarrow_forward
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