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INTRODUCTION, MEASUREMENT, ESTIMATING. - Coggle Diagram
INTRODUCTION,
MEASUREMENT,
ESTIMATING.
Unit, Standards &
SI System
Quantity & Unit
Lenght ---> Meter
Time ---> Second
Prefixes for Power of 10
kilo (k) ---> 10^2
mega (M) ---> 10^6
giga (G) ---> 10^9
Dimensions & Dimensional
Analysis
Technique
physical quantity
Expressed in term of
conbination of basic
quantity
Example:
Velocity = L/T
Order of Magnitude:
Rapid Estimating
Round off all number to one S.F
Then calculate
Result:
at least be right order
of magnitude
Round off to
nearest power of 10
785981.63 ---> 7.85 × 10^6
Measurement & Uncertainty;
Significant Figure
Percent
Uncertainty
Ratio of uncertainty
× 100
Significant Figure
Example:
23.21
4 S.F
0.062
2 S.F
14 × 10²
2 S.F
80 km
Could be
1 S.F
2 S.F
Estimated Uncertainty
+/- sign
Models,
Theories,
Laws
Models
Understanding phenomena
Theory
Testable prediction
Law
Describe how nature
behaves.
In a broad set of circumstances
Principle
Similar to law
Narrower range of phenomena
Nature of Science
Observation
1st step toward scientific theory
Accuration of prediction
Agree better with data
Theory
To explain observation
Can be :
Absolutely verified
Proven false
Converting Unit
Example
1 in. = 2.54 cm
8000 m = 26.25 × 10^3 feets
1m = 3.28 feets