Remainder of Todays Agenda 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 kilogram second ampere kelvin candela mole (m) (kg) (s) (A) (K)
(cd) (mol) length 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 G M k tera giga
mega kilo 1012 109 106 103 d c d n p deci centi milli micro nano pico
10-1 10-2 10-3 10-6 10-9 10-12 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 Chapter 1
Respond to the senders questions by writing a letter. Check all 4 parts to a letter are there including your questions and information. Early Finishers: Draw and colour a picture that goes with your letter.
SEG 2100 Software Design II Author: Timothy C. Lethbridge Last modified by: Stephanie Ludi Created Date: 8/30/2000 4:59:35 PM Document presentation format: On-screen Show Company: University of Ottawa Other titles
They came first for the Communists,and I didn't speak up because I wasn't a Communist.. Then they came for . the trade unionists, and I didn't speak . up because . I wasn't a trade unionist. Then they came for...
Unang Antas Ang korido [Esp., corrido] ay isang anyo ng tulang Espanyol Isang awit o sayaw na isinasagaw sa saliw ng gitara katulad ng pandanggo (dela Costa) Binalbal na salitang Mehikano na buhat sa "occurido" o isang pangyayaring naganap 8...
Strategy: Student to Student Feedback Activity: Conga Line. Pick an Instructional Strategy that we have used today. On a single post it note - write down a math or science activity using one of the strategies on the left to...
A cluster expansion in 3 simple steps. 1) Start with the probability of two nodes being connected (or not) 2) Multiply over the complete graph to get the probability of all possible combinations giving 2N(N-1)/2 terms
This research will help us to build on the strengths of our current specification and to identify the skills students need to progress to further study in Religious Studies. ... We will go through it on the board as part...