Physics chp 1 Introduction and mathmatical concepts
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How many centimeters per inch?
2.5 centimeters = 1 inch
What are the "Le Systeme Internation d'Unites." (SI) units of measurement?
Meter (m) for length, kilogram (kg) for mass, second (s) for time.
What are the CGS units of measurement?
Centimeter (cm) for length, gram (g) for mass, second (s) for time.
What are the British Engineering syste (BE) units of measurement?
Foot (ft) for length, slug (sl) for mass, second (s) for time.
Definition of a meter?
The distance light travels in a vacuum in a time of 1/299,792,458 of a second.
Definition of a kilogram?
The mass of a standard cylinder of platinum iridium.
Definition of a second?
The time needed for 9,192,631,770 electronic wave cycles of cesium- 133.
Define base units:
Units used along with various laws to define additional units for other physical quantities.
Define derived units:
Units for physical quantities that are combinations of the base units.
What are the standard prefixes used to denote multiples of ten?
- tera (T) 10^12
- giga (G) 10^9
- mega (M) 10^6
- kilo (k) 10^3
- hecto (h) 10^2
- deka (da) 10^1
- deci (d) 10^-1
- centi (c) 10^-2
- milli (m)10^-3
- micro (μ) 10^-6
- nano (n) 10^-9
- pico (p) 10^-12
- femto (f) 10^-15
Physical nature of a quantity and the unit used to specify it.
Sine theta (sin θ) =
Opposite over hypotenuse (ho / h)
Cosine theta (cos θ) =
Adjacent over hypotenuse (ha / h)
Tangent theta (tan θ) =
Opposite over adjacent (ho / ha)
Theta (θ) =
- Inverse sine of opposite over hypotenuse, (arc sin), sin-1 (ho / h)
- Inverse cosine of adjacent over hypotenuse, (arc cos), cos-1 (ha / h)
- Inverse tangent of opposite over adjacent, (arc tan), tan-1 (ho / ha)
Define Pythagorean Theorem:
The square of th elength of the hypotenuse of a right triangle is equal to the sum of the squares of the lengths of the other two sides (h2 = ho2 + ha2)
Define scaler (A):
- Quantity with a magnitude
- Quantitiy that can be described with a single number, including any units
Define vector (A>):
- Quantity with a magnitude and direction
- Quantity that deals inherently with both magnitude and direction
Define scaler components:
A point on the x (Ax) and y (Ay) axis equal in quantity to the corresponding x and y vectoer components
Define vector components:
The x (Vector>x) and y (Vector>y) elements of a vector that run parallel to the x and y axis and when aded are egual to the vector
Define unit vector (uˆ)
Vector that has a magnitude of 1 but no dimensions
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