Engineering Formulas
By Beena Ajmera
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About this ebook
6 page laminated guide includes:
- Statics: Vectors, Forces, Moments, Equilibrium, Centroids, Distributed Loads, Centers of Mass, Moments of Inertia
- Dynamics: Particle Kinematics, Particle Kinetics, Energy & Momentum Methods, Kinetics of Rigid Bodies, Plane Motion, Three Dimensional Kinetics
- Mechanics of Materials: Intro, Static Failure Theories, Variable Loading Failure Theories, Torsion, Beams, Columns
- Fluid Mechanics: Intro, One Dimensional Flows, Steady Incompressible Flow Through Pipes or Conduits, Impulse & Momentum, Multipath Pipelines, Flow in Open Channels, Measurements
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Engineering Formulas - Beena Ajmera
Table of Contents
Statics
Dynamics
Mechanics of Materials
Fluid Mechanics
Statics
Review of Vectors
Definitions
Scalar: A real number that can completely describe a physical quantity
EX: Mass of a person is 200 lbs
Vector: Direction and magnitude are needed to completely describe a vector quantity
EX: The beach is located 30 miles south of your home
Both the magnitude and direction must be equal for two vector quantities to be equal
Typically denoted in boldface or with an arrow over the symbol
Unit Vector: Any vector that has a magnitude of one
Review of Vector Mathematics
Vector Addition: For two vectors, R and S, the sum is vector T = R + S, from the tail of R to the head of S, when R and S are placed head to tail
Known as the triangle rule
Vector addition is both commutative and associative
Products of Scalars and Vectors: The product, uR, of a scalar, u, and a vector, R, is change in the magnitude, denoted by |R|, and direction (if the scalar is negative) of the vector EX: 4R has the same direction and four times the magnitude of R EX: (½)R has the same direction and half the magnitude of R EX: –R = (–1)R has the same magnitude but opposite direction of R
For two scalars, u and v, and two vectors, R and S:
u(vR) = (uv)R
(a + b)R = aR + bR
a(R + S) = aR + aS
Vector Subtraction: For two vectors, R and S, the difference, R – S, is simply the sum of R + (–S)
Converting to a Unit Vector: Divide a vector by its magnitude
Dot Products: θ is the angle between R and S when they are placed tail to tail
R • S = |R||S| cosθ
R • S = S • R
a(R • S) = (aR) • S = R • (aS)
T • (R + S) = T • R + T • S
Dot product of two nonzero vectors is zero if and only if the vectors are perpendicular
Cross Products: e is the unit vector that is perpendicular to both R and S
R × S = |R||S| sinθe
a(R × S) = (aR) × S = R × (aS)
T × (R + S) = T × R + T × S
Components of Vectors
A vector, R, can be written as R = Rxi + Ryj + Rzk where Rx, Ry, and Rz are the scalar components of R, and i, j, and k are the unit vectors