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Lecture2 - Lecture 2 Chapter 1a Math Intro Units Sig Figs...

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Lecture 2 Chapter 1a Math Intro: Units, Sig Figs, Vectors, Estimations
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Announcements There will be problem session tomorrow at 7pm center hall 216 Quiz Info: You have 1 week after quiz results are posted to dispute your grade.
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Standards of Quantities Last time we discussed the vastness of the study of physics. (Subatomic to Galactic) Need standard of units to measure and quantify things. Three basic quantities: Time, Length and Mass Everything we deal with in this class (next quarter you will add more fundamental quantities) can be broken up into these three things. Example: Velocity, Acceleration, Force
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SI – Systéme International Main system used in this text Length SI – meter, m Time Seconds, s Mass SI – kilogram, kg Other unit systems? English => [feet, slugs, seconds] Gaussian => [centimeter, grams, seconds]
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Prefixes The prefixes can be used with any base units They are multipliers of the base unit Examples: 1 mm = 10 -3 m 1 mg = 10 -3 g
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Fundamental and Derived Quantities In mechanics, three fundamental quantities are used Length Mass Time Will also use derived quantities These are other quantities that can be expressed as a mathematical combination of fundamental quantities Density is an example of a derived quantity It is defined as mass per unit volume Units are kg/m 3 V m = ρ
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Unit Conversions Sometimes you need to change your units You can use conversion factors with unit value Example, change 1.5 g/cm 3 to kg/m 3 1.5 1,500 kg/m 3
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Unit Conversions How important are unit conversions? In 1999, $125 millon Mars Climate Orbiter was approaching Mars. Contact was lost as it reached Mars. The Orbiter passed 57 km above the Mars surface, instead of the intended 147 km.
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