Lecture2, Chapter 2, Section 1-2


Announcements

  1. Roll Call
  2. Questions

Scientific Notation

  1. Large Numbers
    1. 250
    2. 2.5 * 100
    3. 2.5 * 10 * 10
    4. 2.5 * 102
    5. Counting decimal places
    6. More examples

  2. Small Numbers
    1. 0.025
    2. 2.5/100
    3. 2.5/102
    4. 2.5 * 10-2
    5. Counting decimal places
    6. More examples

  3. When to use it
  4. How to use calculator
    1. EE or EXP
    2. (2.0 * 102) * (2.0 * 105) =
    3. (2.0 * 10-2) * (2.0 * 10-5) =
    4. 5 * (2 + 4) =
    5. (2 + 3) * (2 + 3) =

Units

  1. Significance
  2. SI Prefixes.
  3. SI prefixes (Table 5 from NIST Special Publication 811, 1995 Edition)
    FactorPrefixSymbolFactorPrefixSymbol
    1024yottaY10-1 deci*d
    1021zettaZ10-2 centi*c
    1018exaE10-3 milli*m
    1015 petaP10-6 micro*u
    1012 teraT10-9 nano*n
    109 gigaG10-12 pico*p
    106 mega*M10-15 femtof
    103 kilo*k10-18 attoa
    102 hectoh10-21 zeptoz
    101 dekada10-24 yoctoy
  4. Common Units
  5. Property Unit Abbreviation Conversion
    Distance Meter m  
    Angstrom Å 10-10 m
    Mass Gram g  
    Volume cubic meter m3  
    liter l dm3
    cubic cm cc or cm3 10-3 l
    Time second s  
    Temperature Kelvin K °C + 273.15
    Celsius °C K - 273.15
    Force Newton N kg m s-2
    Energy Joule J Nm or (kg m2 s -2)
    calorie cal 4.184 J
    electron volt eV 1.6021 x 10-19 J
    Power Watt W J s-1
    Pressure Pascal Pa N m-2 (kg m-1 s-2)
    torr torr 133.3 Pa
    mm Mercury mmHg 133.3 Pa
    Atmosphere Atm 101325 Pa
    Bars Bar 105 Pa
    Pounds per Square Inch PSI 6893 Pa
  6. Using Units in problem solving



Homework

  1. Questions
  2. Students work on board

Review Problem

Convert the distance to the beach (200 km) into meters, centimeters, inches, feet, and miles.


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Widener University
Chester, PA 19013

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Last Updated 10/26/02