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if the forces are

if the forces are

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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How do I know if the forces are positive or negative 

Problem 4.6: 4.55. The cantilever beam is built into a wall at O. Neglecting the weight of the beam, determine the support reactions at O. 120 NA 120 N 100 N 400 N 100 N M 400 N - X 4 m 4 m 3 m 360 N 200 N Ry 360 N 200 N 4 m 4 m - 3 m- EF. = 0 EF, = 0 E Mo = 0 Rx 360 – 400 = -40 N Ry = 200 – 120 – 100 = -20 N M = 800 + 540+ 600 – 960 – 1100 = -120 Nm Thus, reaction at O is –40i – 20j N and a clockwise couple 120 Nm.
Transcribed Image Text:Problem 4.6: 4.55. The cantilever beam is built into a wall at O. Neglecting the weight of the beam, determine the support reactions at O. 120 NA 120 N 100 N 400 N 100 N M 400 N - X 4 m 4 m 3 m 360 N 200 N Ry 360 N 200 N 4 m 4 m - 3 m- EF. = 0 EF, = 0 E Mo = 0 Rx 360 – 400 = -40 N Ry = 200 – 120 – 100 = -20 N M = 800 + 540+ 600 – 960 – 1100 = -120 Nm Thus, reaction at O is –40i – 20j N and a clockwise couple 120 Nm.
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