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Unformatted text preview: ciﬁc cylinder kept at the Interna;onal Bureau of Weights and Measures Standard Kilogram Time • Units – seconds, s • The second is currently deﬁned in terms of the oscilla;on of radia;on from a cesium atom 1 second =9,192,631,700 times the period of radiation from the cesium atom Approximate Values • Various tables in the text show approximate values for length, mass, and ;me Note the wide range of values for Lengths, Masses and Time intervals Other Systems of Measurements • cgs – Gaussian system – Named for the ﬁrst leUers of the units it uses for fundamental quan;;es • US Customary – Everyday units – O[en uses weight, in pounds, instead of mass as a fundamental quan;ty Units in Various Systems System Length Mass SI
meter
kilogram
cgs
centimeter gram
US
foot
slug
Customary Time
second
second
second Preﬁxes • Preﬁxes correspond to powers of 10 • Each preﬁx has a speciﬁc name • Each preﬁx has a speciﬁc abbrevia;on Expressing Numbers • Numbers with more than three digits are wriUen in groups of three digits separated by spaces – Groups appear on both sides of the decimal point • 10 000 instead of...
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This document was uploaded on 01/14/2014.
 Winter '14
 Physics

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