PEARSON ETEXT ENGINEERING MECH & STATS
15th Edition
ISBN: 9780137514724
Author: HIBBELER
Publisher: PEARSON
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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
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
If the clamping force at G is 900 N, determine the horizontal force F that must be applied
perpendicular to the handle of the lever at E. The mean diameter and lead of both single square-
threaded screws at C and D are 25 mm and 5 mm, respectively. The coefficient of static friction
is μ = 0.3.
-200 mm-
OA
200 mm
B.
C
D
E
125 mm
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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 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_forward
- The 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_forwardThe 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 · Ibarrow_forwardThe 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_forward
- I need the answer quicklyarrow_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_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
- I need the answer as soon as possiblearrow_forwardCouple forces of F= 35N are applied to the handle of the machinist's vise. The guid at B is smooth. The Single square threaded screw has a mean radius of 6 mm and a lead of 8 mm, and the coefficient of static friction is us=0.27arrow_forwardDetermine the angle of contact () in degrees of the belt supported on a pulley if the belt is having a load of 98 N on the tight side and a load of 60 N on the slack side. Take the coefficient of friction as 0.25.arrow_forward
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