Problem 2.84 The magnitudes of the two force vectors are |FA| = 140 lb and Fal = 100 lb. Determine the mag- nitude of the sum of the forces F₁+F₂. Problem 2.85 Determine the direction cosines of the vectors FA and FB. Answers FA+Fal= 217 lb F₁: cos, -0.587, cos8,-0.643, cos8,-0.492 Fa: cose,=-0.250, cos 6,=0.866, cos=0.433 60 30 50°
Plane Trusses
It is defined as, two or more elements like beams or any two or more force members, which when assembled together, behaves like a complete structure or as a single structure. They generally consist of two force member which means any component structure where the force is applied only at two points. The point of contact of joints of truss are known as nodes. They are generally made up of triangular patterns. Nodes are the points where all the external forces and the reactionary forces due to them act and shows whether the force is tensile or compressive. There are various characteristics of trusses and are characterized as Simple truss, planar truss or the Space Frame truss.
Equilibrium Equations
If a body is said to be at rest or moving with a uniform velocity, the body is in equilibrium condition. This means that all the forces are balanced in the body. It can be understood with the help of Newton's first law of motion which states that the resultant force on a system is null, where the system remains to be at rest or moves at uniform motion. It is when the rate of the forward reaction is equal to the rate of the backward reaction.
Force Systems
When a body comes in interaction with other bodies, they exert various forces on each other. Any system is under the influence of some kind of force. For example, laptop kept on table exerts force on the table and table exerts equal force on it, hence the system is in balance or equilibrium. When two or more materials interact then more than one force act at a time, hence it is called as force systems.
Answer both
![Problem 2.84 The magnitudes of the two force vectors
are FA 140 lb and F = 100 lb. Determine the mag-
nitude of the sum of the forces FA + FB-
Problem 2.85 Determine the direction cosines of the
vectors FA and F.
Answers
FA+Fal= 217 lb
F₁: cos,=0.587, cos 0, 0.643, cos 8, = 0.492
Fa: cos, -0.250, cos 6,
0.866, cos = 0,433
Problem 2.90 In Example 2.9, suppose that the metal
loop at A is moved upward so that the vertical distance to
A increases from 7 ft to 8 ft. As a result, the magnitudes
of the forces FAB and FAC increase to FAB = FAC=
240 lb. What is the magnitude of the total force F =
FAR+FAC exerted on the loop by the rope?
44
|--6-
B
210-
The magnitude is F=440 lb
म
60
30° 50
7 ft
-68-
FAR
10 ft
40](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F4fb926f3-6605-4817-8967-13d0592888bb%2F23c6d3e9-8729-489f-8c6d-71b455a7ce98%2F3bpsrlo_processed.jpeg&w=3840&q=75)
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