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phys - Chp.1-Measurements Standard 1 Length-the distance...

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Chp.1-Measurements Standard 1. Length-the distance between two points, we use the meter as a standard. a. 1 meter(m)=the distance light travels in a vacuum in 1/299,792,458 seconds. 2. Time-defined by a repetitive motion of an object. a. 1 second(s)=9,192,631,770 vibrations of radiation from a cescium-137 atom 3. Mass-for now,its like weight a. 1 Kilogram(kg)=the mass of a specific cylinder kept in France The powers of Ten Prefix Power Abbreviations Nano 10E-9 n Micro 10E-6 m(mu) Milli 10E-3 m Centi 10E-2 C Kilo 10E3 K Mega 10E6 M Giga 10E9 G Examples: 1Millimeter=1mm,10E-3m 1Kilogram=1kg,10E3g -The quantities length, mass and time are called fundamental quantities. -Other quantities are called derived Examples: Area= 1m[ square ] 1m Area= 1m^2 Volume= 1m x 1m x 1m V=1m^3 4. Density-mass per unit volume a. D=m/V units of kg/m^3 5. Speed-is distance over time speed has units m/s a. Speed is denoted by V,Distance by X, Time by t. V=X/t Dimensional Analysis- Shorthand for analysis of units.
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