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 supportreactions at O.120 NA120 N100 N400 N100 NM400 N- X4 m4 m3 m360 N200 NRy360 N200 N4 m4 m -3 m-EF. = 0EF, = 0E Mo = 0Rx360 – 400 = -40 NRy= 200 – 120 – 100 = -20 NM = 800 + 540+ 600 – 960 – 1100 = -120 NmThus, reaction at O is –40i – 20j N and a clockwise couple 120 Nm.

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Mechanics of Materials (MindTap Course List)

9th Edition

ISBN:9781337093347

Author:Barry J. Goodno, James M. Gere

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Chapter5: Stresses In Beams (basic Topics)

Section: Chapter Questions

Problem 5.12.11P: A cylindrical brick chimney of height H weighs w = 825 lb/ft of height (see figure). The inner and...

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Question

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.

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