The bar rests against a 6-27 The bar shown in Fig. smooth vertical wall at end D. The support at A is a ball- and-socket joint. The cable is not continuous at B. D

Mechanics of Materials (MindTap Course List)
9th Edition
ISBN:9781337093347
Author:Barry J. Goodno, James M. Gere
Publisher:Barry J. Goodno, James M. Gere
Chapter1: Tension, Compression, And Shear
Section: Chapter Questions
Problem 1.4.10P: A long re Lai nine: wall is braced by wood shores set at an angle of 30° and supported by concrete...
Question
The bar rests against a
6-27 The bar shown in Fig.
smooth vertical wall at end D. The support at A is a ball-
and-socket joint. The cable is not continuous at B.
D
Transcribed Image Text:The bar rests against a 6-27 The bar shown in Fig. smooth vertical wall at end D. The support at A is a ball- and-socket joint. The cable is not continuous at B. D
Expert Solution
Step 1:-Given data

Let 

m=mass of the bar ;a=distance between mass (m) & point A ;

Mechanical Engineering homework question answer, step 1, image 1

Step 2:-Equilibrium condition

Let the system is in equilibrium condition ;

In that condition we can apply equilibrium condition ;

nFY=0 ;

(RA+RD)-m×g+T=0 ;(RA+RD+T)=m×g .............1

 

nFX=0 ;

RDX=0 ;

 

nFZ=0 ;T=0 ;  .................2

 

nMA=0 ;mg×a-RD×2a=0 ;RD×2a=mg×a ;RD=12×m×g ;RD=12×m×9.81 ;RD= 4.905 × m ; ......................3

 

Now putting the equation (2) & equation (3) in equation (1) ;

(RA+RD+T)=m×g ;(RA+4.905 × m+0)=m×g ;RA=mg-4.905 × m ;RA=g-4.905  × m ;RA=9.81-4.905  × m ;RA= 4.905× m ; .............................4

 

 

 

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