Todays Agenda on Units Primary and Secondary Physical Quantities and Units Unit Conversion Standard We Will Use We will follow the International System of Units also known as the SI standard It includes: Distance measured in meters (m) Mass measured in kilograms (kg) Time measured in seconds (s) Charge measured in Coulombs (C) Temperature measured in degrees Kelvin (o K or K) That means well need to convert other measures to our standard
Fundamental or Primary Quantities 7 SI base units: those from which all others are derived meter (m) kilogram second (s) ampere (A) kelvin (K) candela(cd) mole (mol)
length (kg) weight time current temperature luminosity molecular quantity Quick in-class exercise: Identify physical examples, and electrical examples Derived or Secondary Quantities SI derived unit: derived from base units Unlimited number of derived units! Some examples:
meter / second meter / second squared newton pascal joule volt watt ohm
farad henry hertz (N) (Pa) (J) (V) (W) ()) (F) (H) (Hz) m/s m/s2 kgm / s2 N / m2
Nm kgmm2ms3mA1 J/s V/A C/V Vms / A 1/s velocity acceleration force pressure energy voltage power resistance capacitance inductance
frequency Commonly used prefixes T tera 1012 G giga M mega k kilo 103 d deci10-1 c centi m milli 10-3 micro n nano p pico10-12 109 106 10-2
10-6 10-9 What Units Should We Use? Example distance units: Example time units: What Happens If We Mix Units? Consider the Mars Climate Orbiter that was launched in 1998 (see handout). It turns out that someone at NASA forgot to convert English units (pounds) to metric units (Newtons) when calculating the necessary rocket thrust to put the craft in orbit around Mars Guess what happened?
Class Activity #1 a.) A tractor-trailer truck is traveling at 60 miles per hour eastbound on Interstate 195 towards the North Dartmouth exit. Determine the speed of the truck i.) in feet per second ii.) in meters per second iii.) in kilometers per hour. b.) What is the maximum legal speed in centimeters per hour in a 55 miles per hour posted speed zone? Homework for next class In the textbook, Read Chapter I (Introduction) Read Chapters 1 and 2
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Andy Warhol. Andy Warhol lived his life as an American painter, film- maker and author born in 1928 in Pittsburgh and had moved to new York in 1949 to then work as a commercial artist. Andy Warhol also known as...
Chapter 18 Classification The diversity of life Domain Eukarya 4. Kingdom Fungi Absorptive heterotrophs - absorb nutrients through their bodies Feed on dead or decaying organic matter Many are multicellular Yeast is unicellular Domain Eukarya 5.
Medical care was lacking ... importance to the Southern economy Lincoln realized that freeing slaves would cripple the cotton industry Effects of Emancipation Making slavery a focus of the war won respect from Europe Made it less likely that they...
Kevin Brady (R-TX) and Paul Ryan (R-WI) will vie for the Chairmanship. Jim Gerlach (R-PA), Tim Griffin (R-AR) and Allyson Schwartz (D-PA) are retiring. Key Departures from Appropriations Committee include: Both the Chairman (Tom Latham, R-IA) and the Ranking Member...
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