Office HoursOffice HoursMon: 11:30a to 12:30p & 1:45p to 3:00pTue: No office hours, unavailableWed: 11:30a to 12:30pThr: 9:15a to 12:30pFri: 10:00a to 12:00p

Course Syllabus can be found at:

http://www.wx4sno.com/portfolio/BSU/spring_2012/

This lecture will be posted AFTER class at:

http://www.wx4sno.com/portfolio/BSU/spring_2012/lectures/

Chapter 1Chapter 1Metric Conversions

Types of ConversionsTypes of ConversionsTwo major sets of unitsEnglish system

◦Feet, miles, Fahrenheit, etc.◦Used primarily in the U.S. among the

public populationMetric system

◦Known as the Systeme International or S.I. system

◦Meters, kilometers, Celsius, etc.◦World-adopted◦Entire scientific community uses it!

English to S.I.English to S.I.

S.I. to EnglishS.I. to English

RoundingRoundingAlways round your answer to the

least precise measurement given.e.g.

5.7 cm ÷ 1.75 min= 3.2571429 cm/min= 3.3 cm/min

What about rounding up or down?

Rounding, cont.Rounding, cont.If the first digit to be dropped is less

than 5, then the preceding digit is unchanged.

If the first digit to be dropped is greater than or equal to 5, the preceding digit is rounded up.

e.g.1020.63 becomes?1020.6

25.85 becomes?25.9

Sample ProblemsSample ProblemsConvert the following metric

measurements to English units using exact conversion factors. Round answers to one decimal place.

1.299,792,458 meters per second ? feet per second

2.-273.15 °C ? °F

3.6,356.766 kilometers ? Miles?

Chapter 2Chapter 2Location

Latitude & LongitudeLatitude & LongitudeLocations on earth can be pin-pointed

using a grid system of angular measures known as latitude and longitude

Latitude: location north or south of equator◦Lines of latitude are called parallels◦1° latitude = 111 km

Longitude: location east or west of prime meridian◦Lines of longitude are called meridians◦1° longitude = function of latitude, varies

Use formula: 1° longitude = cos(latitude) x 111 km

Latitude & Longitude, Latitude & Longitude, cont.cont.The prime meridian is located in

Greenwich, England at the Royal Observatory. ◦This is also the starting location of UTC or

GMT time measurements used by meteorologists and other scientists…more on this next week!

Locations east of the prime meridian are considered “degrees east longitude,” while locations west of the prime meridian are called “degrees west longitude.”

Latitude & Longitude, Latitude & Longitude, cont.cont.

From 0° to 90° From 0° to 180°

Where is 78Where is 78°S, 106°E°S, 106°E

Where is 32Where is 32°N, 13°E°N, 13°E

Latitude & Longitude, Latitude & Longitude, cont.cont.More exact measurements of latitude

and longitude are sometimes required.◦ Fractions of degrees in minutes and seconds

1 ° = 60’◦ (one degree equals sixty minutes)

1’ = 60”◦ (one minute equals sixty seconds)

e.g.◦ 40° 11′ 36″ N,  85° 23′ 17″ W

Where is 46Where is 46° 24’ 30” N, 105° 40’ 24” W° 24’ 30” N, 105° 40’ 24” W

Where is 46Where is 46° 24’ 30” N, 105° 40’ 24” W° 24’ 30” N, 105° 40’ 24” W