PEARSON ETEXT ENGINEERING MECH & STATS
15th Edition
ISBN: 9780137514724
Author: HIBBELER
Publisher: PEARSON
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The 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 mm
i need the answer quickly
The figure shows a part of a machine used to crush recycled cans. Link ABC is attached to the ground at pin A and link BD is attached to the piston D using also a pin connection. When α=45°, θ=55°, and β=15°, the machine is about to start moving, i.e. impending motion. If the coefficient of static friction and kinetic friction between the piston D and the wall are μs=0.25 and μk=0.2 respectively, find the magnitude of force applied to the cans by the piston for P=200 kN.
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- The 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 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 square-threaded screw 0f the C-clamp has a mean diameter of 8 mm and a pitch of 1.6 mm. The coefficient of static friction between the threads is 0.2. If the torque C=1.50Nm is used to tighten the clamp, determine (a) the clamping force; and (b) the torque required to loosen the clamp.arrow_forward
- The three identical rollers are stacked on a horizontal surface as shown. If the coefficient of static friction ugis the same for all pairs of contacting surfaces, find the minimum value of u, for which the rollers will not slip. Answer: Ps=arrow_forwardI need the answer as soon as possiblearrow_forwardFind the value s so that the worker can climb the ladder without causing it to slip. The weight of the worker is 90-kg and neglect the weight of the ladder. The ladder has a small roller at the top and at the ground the coefficient of static friction is 0.25. The center of mass of the worker is directly above her feet. B 4 m 1.5 marrow_forward
- 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 Barrow_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_forwardI need the answer quicklyarrow_forward
- Show complete solution. Draw FBDarrow_forwardThe three identical rollers are stacked on a horizontal surface as shown. If the coefficient of static friction µ is the same for all pairs of contacting surfaces, find the minimum value of μs for which the rollers will not slip. - Answer: Us=arrow_forwardCalculate the horizontal force P on the light 15° wedge necessary to initiate movement of the 59-kg cylinder. The coefficient of static friction for both pairs of contacting surfaces is 0.39. Also determine the friction force FB at point B. (Caution: Check carefully your assumption of where slipping occurs.) P Answers: P= i 596 FB = i 366 159 59 kg B N N Aarrow_forward
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