lecture1_09 - College Physics 1: Phy 2053 Chapter 1:...

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1 College Physics 1: Phy 2053 Chapter 1: Numbers and Things ~ 10 21 m From Astronomical scales. . ..to planetary scales. . ~ 10 6 m ..to the microscopic and smaller ~ 10 -10 m Atomic scale image of graphite taken in the Biswas lab. Newton Quantum http://www.videosift.com/video/IBM-Powers-Of-Ten-amazing-9-minute-science-video ± you will need a few more defined units in PHY 2054 ± Units can be treated as algebraic quantities ± add, subtract, multiply, divide Time remaining = 50 min – 20 min = 30 min Area = width x height = 4 cm x 5 cm = 20 cm 2 ± e.g., SI unit of area: meter 2 (m 2 ) SI Unit of speed: meter/second (ms -1 ) ± To convey certain physical property of an object. ± Units of length: meter, foot, inches, lightyears…. ± SI - S ystéme I nternational (MKS=Meters-Kilograms-Second) ± CGS – Gaussian system (Centimeters-Grams-Second) ± US Customary (foot-slug-second) Units Dimensions ± Length [ L ] ± Mass [ M ] ± Time [ t ] ± Temperature [ T ] Dimensional Analysis ± Technique to check the correctness of an equation.
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