Problem 3. If the resultant moment acting on the beam is to be 12 k kN*m, calculate the requiredmagnitude of force F. Why does the reference point not need to be specified in this case?30 308 kN- 0.3 m1.2 m0.4 m8 kN Problem 4. Calculate the resultant moment produced by the two forces shown:a) about point O.b) about point B.Express both of your answers as vectors.300 mm200 mm150 mm25 NB25 N|- 400 mm200 mm

Problem 3. If the resultant moment acting on the beam is to be 12 k kN*m, calculate the required magnitude of force F. Why does the reference point not need to be specified in this case? -F F \30 8 kN 0.3 m 1.2 m 0.4 m 8 KN

Problem 3. If the resultant moment acting on the beam is to be 12 k kN*m, calculate the required magnitude of force F. Why does the reference point not need to be specified in this case? -F F \30 8 kN 0.3 m 1.2 m 0.4 m 8 KN

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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Concept explainers

System of Forces

A force is an external influence or agent that changes the state of a system. According to Newton's second law, the force applied to a body is proportional to the change in momentum of a body. Hence, whenever a force is applied to a body, its momentum changes. If the body is at rest, under the action of force, its state of rest changes to motion. In other words, the magnitude of the momentum of the body changes from zero to a measurable value. Similarly, if the body possesses some initial velocity, it has some associated momentum, the effect of force can cause the body to halt or come to rest, that is, the momentum reduces to zero.

Question

Problem 3. If the resultant moment acting on the beam is to be 12 k kN*m, calculate the required
magnitude of force F. Why does the reference point not need to be specified in this case?
30 30
8 kN
- 0.3 m
1.2 m
0.4 m
8 kN

Problem 4. Calculate the resultant moment produced by the two forces shown:
a) about point O.
b) about point B.
Express both of your answers as vectors.
300 mm
200 mm
150 mm
25 N
B
25 N|
- 400 mm
200 mm

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