PHY101 slides

# PHY101 slides - 9/26/2009 Chapter 1. Introduction: Basic...

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9/26/2009 1 Chapter 1. Introduction: Basic Concepts and Math Greek word „ fusis ‟: meaning nature or natural things Branch of science that studies natural Phenomena in terms of basic laws and quantities - Concepts and Quantities : length, time, mass, force, energy, etc. - Measurements/Experiments : Relationship between quantities - Laws/Theories : Measurements obey laws, e.g., F = ma - Predictions and Designs : Laws/theories are used to make predictions and designs Newton’s laws Rocket science Maxwell’s equations Telecommunications

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9/26/2009 2 Questions: 3 cats + 2 dogs = ? + = ?? That was a silly question. But seriously, 5 ft + 6 m = ? 1 slug + 3 kg = ? Need to establish a STANDARD unit system What is “slug”, anyway? SI units (Le Système International d‟Unit és) Established in 1960 Three Fundamental Quantities in Mechanics Quantity Symbol SI Unit Unit Symbol Length L meter m Mass M kilogram kg Time T second s We will be using the SI unit system unless otherwise specified.
9/26/2009 3 Please log on to Ublearns (ublearns.buffalo.edu) for - Syllabus - Lecture slides - Course announcement - Discussion board - much more! What do you need to log on to Ublearns: UBIT account password Don‟t know your UBIT account? http://ubit.buffalo.edu/newstudent/ CIT Help Desk 214 Lockwood (716) 645-3542 [email protected] http://helpdesk.buffalo.edu Meter : distance traveled by light during a time interval of 1/299 792 458 seconds! Kilogram : a specific block of platinum/iridium alloy kept in France Second : 9 192 631 700 oscillations of radiation from the cesium atom Don’t try to remember these crazy numbers.

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9/26/2009 4 Length (m) Mean orbit radius of Earth about Sun 2×10 11 Mean radius of Earth 6×10 6 Length of football field 90 Size of small dust particles 1×10 -4 Size of a typical cell 1×10 -5 Diameter of a hydrogen atom 1×10 -10 Mass (kg) Sun 2×10 30 Earth 6×10 24 Human 70 Mosquito 1×10 -5 Bacterium 1×10 -15 Electron 9×10 -31 Time interval (s) Age of Universe 5×10 17 One year 3×10 7 One day 9×10 4 Period of radio waves 1×10 -6 Period of visible light waves 2×10 -15 Useful Mathematics Review can be found in Appendix A.
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## This note was uploaded on 01/02/2010 for the course PHY 101 taught by Professor Pralle during the Spring '08 term at SUNY Buffalo.

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PHY101 slides - 9/26/2009 Chapter 1. Introduction: Basic...

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