12. Determine the resultant of the forces shown in the frame and indicate where its line of action intersects member AB measured from point A. 2.5 ft 3 ft SUMMARY OF ANSWERS 45° 2 ft 300 lb R 200 Ib 4 ft 250 lb y

Q: А B

A:

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A:

Q: On the bending moment, between A and B...what is that? 2 raised to an exponent?

A: Given data: Bending moment diagram

Q: 3-N 200 N 200N 300N

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Q: Express the force as a Cartesian vector.

A:

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A:

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.