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2011 EESA Assignment 3 Presentation - Assignment 3...

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Assignment 3: Mathematical Conversions of Quantities and Units EESA01 Fall 2011
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Agenda Quantities, Dimensions and Units Prefixes Scientific Notations Precision and Accuracy Significant Digits Rounding
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Quantities, Dimensions and Units Quantities: Distinguished as ‘basic’ and ‘derived’ measuring variables Dimensions: Arbitrary initials assigned to quantities International System of Units S.I. units are used so basic and derived quantities are standardized and defined in terms of grams, meters, and seconds,
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Basic Quantities Basic quantities, dimensions and units - Mass (M): kg - Length (L): m - Time (T): s - Temperature (t): K Basic quantities can be derived into more complex quantities, dimensions and units ex. Area (L2): m2 and Volume (L3): m3
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Derived Quantity: ENERGY Definition: is the capacity or ability to do work. Energy = Work =Force x Distance What does this really mean? the more energy you have, the more work you can do (e.g. walking, doing school work, etc.) another way to see it is that work (energy you put into an activity) is the measure of the force you exert multiplied by the distance, or W = F x D. If you push a really heavy object a certain distance, you do more work than if you push a lighter object that same distance.
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DIMENSIONS OF ENERGY Energy or Work = Force X Distance = (Mass x Acceleration) X Length = (Mass x Length x Time-2) X (Length) = (M x LxT-2) X L = M x L2 x T-2 OR = kg x m2 x s-2 = 1 Joule (S.I. Unit) What is a Joule?? A Joule is the S.I. unit for Energy and is therefore defined by the equation, J = kg x m2 x s-2 A Joule is the measure of the amount of work or energy expended. 1 Calorie = 4.1868 Joules Note: Calorie is not the SI Unit for energy
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Derived Quantity: PRESSURE Definition: For an object sitting on a surface, the force pressing on the surface is the weight of the object, and therefore the object exerts pressure on the surface.
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