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Units of length

Bob Jones PPT Notes -- Chapter 3a

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Measuring and Units 1 All slides in this section contain: Clipart.com items: 8260752, 7804277 The Dominion Mandate requires us to gain knowledge about God?s creation. To do so, we must take measurements. Measurement measurement the act of comparing an unknown quantity to a standard unit When you write a measurement ? You must have a number. You must have a unit. (How much information does the statement ?I ran 7? give you?) instrument a device to aid in measuring Is accurately subdivided Is calibrated Instrument Has units on a scale Started with the metric system. Expanded to SI. SI System (International System of Units) We will use 5 of these. There are 7 base units. SI System (International System of Units) base units units that do not come from other units Chemistry Base Units

AP Physics

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Presentation of chapter 1 Frank Chen Period 5 1.4 Conversion of Units In 1960, an international committee established a set of fundamental quantities of science which is called SI. There is also a set of U.S. customary units, theses are some examples of convert U.S. into SI: 1 mile = 1609 m = 1.609 km; 1 m = 39.37 in. = 3.281 ft; 1 ft = 0.3048m = 30.48 cm; 1 in = 0.0254m = 2.54 cm Conversion Factors The method to convert the different units into the required unit Ex. 13.0 in. = (15 in.)(2.54 cm/1in.) = 38.1 cm 1.5 Order of magnitude Order of Magnitude is an scientific method use symbol ?~?to estimate a magnitude round into one digit and expressed in scientific notation. Ex. 0.00054m ~ 10^-4m 3600m ~ 10^3m 4 1.6 Uncertainty in Measurements
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