PEARSON ETEXT ENGINEERING MECH & STATS
15th Edition
ISBN: 9780137514724
Author: HIBBELER
Publisher: PEARSON
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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 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 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.
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- 4. Determine the torque M that must be applied to overcome friction if u, = 0.35 and the annular ring bearing is subjected to a thrust of 800 Ibs. M 0.75 in. 2'in. P = 800 lb 1 in.arrow_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_forwardThe block brake consists of a pin-connected lever and friction block at B. The coefficient of static friction between the wheel and the lever is μs = 0.3, and a torque of 5 N ⋅m is applied to the wheel. Determine if the brake can hold the wheel stationary when the force applied to the lever is (a) P = 30 N, (b) P = 70 N Draw the free-body diagram of the lever.arrow_forward
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