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why is there no moment at b?

why is there no moment at b?

Elements Of Electromagnetics
Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
ChapterMA: Math Assessment
Section: Chapter Questions
Problem 1.1MA
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why is there no moment at b?

•5-41. Determine the horizontal and vertical components of reaction at the pin A and the reaction of the smooth collar B on the rod. 450 Ib 300 Ib Equations of Equilibrium: From the free - body diagram, Ay and Ng can be 4 ft' obtained by writing the force equation of equilibrium along the y axis and the moment equation of equilibrium about point A. 1 ft 1 ft +1 EF, = 0; Ay – 300– 450 = 0 30016 45016 Ay = 750 Ib Ng (4 sin30°)– 300(1)– 450(3)=0 Ng = 825 Ib Ans. (+ZMA = 0; 30° 4ft Ans. Ax Using the result Ng = 825 lb and writing the force equation of equilibrium along Ay (a) thex axis, EF, = Q Az - 825 = 0 A = 825 Ib Ans.
Transcribed Image Text:•5-41. Determine the horizontal and vertical components of reaction at the pin A and the reaction of the smooth collar B on the rod. 450 Ib 300 Ib Equations of Equilibrium: From the free - body diagram, Ay and Ng can be 4 ft' obtained by writing the force equation of equilibrium along the y axis and the moment equation of equilibrium about point A. 1 ft 1 ft +1 EF, = 0; Ay – 300– 450 = 0 30016 45016 Ay = 750 Ib Ng (4 sin30°)– 300(1)– 450(3)=0 Ng = 825 Ib Ans. (+ZMA = 0; 30° 4ft Ans. Ax Using the result Ng = 825 lb and writing the force equation of equilibrium along Ay (a) thex axis, EF, = Q Az - 825 = 0 A = 825 Ib Ans.
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