PEARSON ETEXT ENGINEERING MECH & STATS
15th Edition
ISBN: 9780137514724
Author: HIBBELER
Publisher: PEARSON
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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=
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. • Ib
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
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- The pressure distribution at the pivot bearing's surface of contact changes, as indicated. Determine the torque M necessary to overcome friction if the shaft sustains an axial force P and the coefficient of static friction is.arrow_forwardThe uniform cylindrical drum weighs 250 lbs and is supported by a frictionless roller at A and the frame at C. The coefficients of friction between the frame and the drum at C are as follows, static coefficient u: = 0.3 and kinetic coefficient uk = 0.25. If the drum is at rest, find M required to start the drum moving? For full credit show a labeled free-body diagram. 2' 30°arrow_forwardanswer all the question with the steps pleasearrow_forward
- 3. 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_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_forwardThe 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_forward
- 2. Determine the smallest horizontal force P required to pull out wedge A. The crate has a weight of 300 kb and the P coefficient of static friction at all contacting surfaces is s = 0.3. Neglect the weight of the wedge B 15°arrow_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_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 cylinder with mass, m = 30 kg, and 400 mm diameter rests against the surfaces as shown in the figure. Assume that the coefficient of static friction is = 0.25. Determine the minimum value of the moment, M, to apply so to make the cylinder slip. 30°arrow_forwardCalculate the horizontal force P on the light 14° wedge necessary to initiate movement of the 58- kg cylinder. The coefficient of static friction for both pairs of contacting surfaces is 0.23. Also determine the friction force Fg at point B. (Caution: Check carefully your assumption of where slipping occurs.) 58 kg B P > 149 Answers: P = i FB = i Narrow_forwardI want also the reference please.if you knowarrow_forward
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