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lecture2_09

# lecture2_09 - PHY 2053 announcements January 8 2009...

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1 PHY 2053 announcements: January 8, 2009 •Textbook: College Physics I by Serway/Vuille soft cover with white background •Optional course packet (blue book): available at Target copy on Friday •Webassign: free for 11 more days please logon and enter the code from textbook email me if you have problems with login 1 st assignment not for credit •Clickers: will start practice today please get one! ± 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. Both sides of equation must have the same dimensions ± 1 hour = 3600 s dimension t on both sides ± Area = width x height 4 cm x 5 cm = 20 cm 2 dimension L 2 on both sides Significant Figures ± There is uncertainty in every measurement ± A significant figure is one that is reliably known ± 3.1416 ± All non-zero digits are significant ± 13 2 significant figure ± 13.14

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lecture2_09 - PHY 2053 announcements January 8 2009...

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