Frictionless rollers support the side blocks vertically. The side blocks in turn support the 8lb block viafriction.A. At what friction coefficient is the motion of the 8 lb block impending?B. What is the friction force on the left side of the 8 lb block when μ = 0.8?C. Given your result from part B, at μ=0.8 is the 8 lb block:a. Static but not impendingb. At impending motionc. Moving against kinetic friction16 lb·μ=?16 lb8 lbupudu u än pääs *ɔ 'q = =

Answered: Frictionless rollers support the side…

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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PROBLEMS 237. The lower ends of the three bars in the figure are at the same level before the rigid homogeneous 18Mg block is attached. Each steel bar has an area of 600mm² and E=200GPa. For the bronze bar, the area is 900mm² and E-83GPa. Find the stress developed in each bar. BRONZE 1.6M STEEL 1M 18Mg STEEL 1M ТЕСНА
a) Transform the beam into one made entirely of steel. b) The steel channel is used to reinforce the wood beam. Determine the maximum stress in thesteel and determine the maximum stress in the wood if the beam is subjected to a moment of M=1.2kN.m Est = 200GPa, Ew12GPa. (please give explanations and step by step solutions if possible)
A two pinned end bars AB (Copper), ? = 850 ??2, ? = 120 ??? and BC (Aluminum), ? = 1000??2, ? = 70 ??? is subjected to a horizontal force of 100 ?? applied at pin B as shown in the figure, determine the horizontal displacement of pin B.
Q4) Determine the maximum shear stress acting in the fiberglass beam at the section where the internal shears force is maximum. (tı=15 mm, t2=20 mm, h=150 mm, b=50 mm) 。王! 20 kN/m A |-b-| to 2 m 2 m - 2 m
امتحان الشهر الثا. . . -> The lower ends of the three steel bars in Figure are at the same level before the applied concentrated force 15 kN. Determine the force in the steel bars if the temperature is increased by 40°C. Neglect the weight of bar ACE. Bars AB,CD and EF each have a cross- sectional area of 25 mm ? and a =11.7 *10 m/ m-°C. 715 KN 0.2 m 0.4 m
The center post B of the assembly has an original length of 124.7 mm, whereas posts A and C have a length of 125 mm. If the caps on the top and bottom can be considered rigid, determine the average normal stress in each post. The posts are made of aluminum and have a cross-sectional area of 400 mm Eal = 70 GPa. |800 kN/m +100 mm -100 mm A B 125 mm I800 kN/m Answer: 0A = 0c = 189 MPa, oB 21.4 MPа
A line is recorded as 472.90 m long. It is measured with a 0.65 kg tape which is 30.005 m long at 20oC under a 50 N pull supported in both ends. During measurement, the temperature is 5oC and the tape is measured under a 75 N pull. The line is measured on 3% grade. E = 200 GPa, cross sectional area of tape is 3 mm2 and the coefficient of linear expansion is 0.0000116 m/oC Compute the actual length of tape during measurement Compute the total error to be corrected for the inclined distance What is the horizontal distance?
A:Y 211O 2_531929016114... -> A rod is composed of an aluminum section rigidly attached between steel and bronze sections, as shown in Figure below. Axial loads are applied at the positions indicated. If P = 11 KN and the cross sectional area of each rod is 312.5 mm, determine the stress in each section. 4P Steel Bronze |Aluminum 609.6 mm 914.4 mm 762 mm
500 MPa 0.006 120 kN 100 mm - 20 mm 120 kN The tensile load is now removed, and the ends are now subject to a shear force of 10 KN in the same plane as the cross-section (i.e., the force is acting "horizontally"). Assume elastic behavior. d) Determine the shear strain resulting from this shear force (ignoring any bending effects) e) What is the horizontal displacement of one end of the rod relative to the other end under this shear force?
A solid steel shaft in a rolling mill transmits 30 kW of power at 2 Hz. If the shear stress is not to exceed 40 MPa and the angle of twist is limited to 6° in a length of 3m. Use G = 83 GPa. Determine the torque may produce by the mill. If the shearing stress be considered, what is the required to diameter of the shaft? Determine the smallest safe diameter of the shaft.
4. A copper bar 250 mm long and 50mmx50mm in cross-section is subjected to an axial pull in the direction of its length. If the increase in volume of the bar is 37.5 mm', find the magnitude of the pull. Take p-0.25 and E-100GPA. Answer: P-30 KN. 5. A steel bar 50mmx50mm in cross-section is 1.2 m long. It is subjected to an axial pull of 200 KN. What are the changes in length, width and volume of the bar, if the value of Poisson s ratio is 0.3 ? Take E as 200 GPa. Answer Al-0.48mm, Ab-0.006mm and AV-480 mm'. 6. A reetangular bar 500 mm long and 100mmx50mm in cross-section is subjected to forces as shown in figure. What is the change in the volume of the bar? Take modulus of elasticity for the bar material as 200 GPa and p-0.25. Answer :AV-137.5 mm'. 300 KN 100 KN 50 100 200 KN 500 mm
5. A rigid bar AB, 9 m long is suspended by two vertical rods at its end A and B and hangs in a horizontal position by its own weight. The rod at A is brass, length 3m, cross-sectional area is 1000 mm? and E̟ =1×10°N/ mm? . The rod at B is steel, length 5 m , cross-sectional area is 445 mm?. At what distance 'd' from A may a vertical load P=300ON be applied if the bar is to remain horizontal even after the load is applied? ve stred Steel 5m Brass 3m P = 3000N B 9m

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