# Lecture2, Chapter 2, Section 1-2

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.  Factor Prefix Symbol Factor Prefix Symbol 1024 yotta Y 10-1 deci* d 1021 zetta Z 10-2 centi* c 1018 exa E 10-3 milli* m 1015 peta P 10-6 micro* u 1012 tera T 10-9 nano* n 109 giga G 10-12 pico* p 106 mega* M 10-15 femto f 103 kilo* k 10-18 atto a 102 hecto h 10-21 zepto z 101 deka da 10-24 yocto y
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.