Office Hours Mon: 11:30a to 12:30p & 1:45p to 3:00p Tue: No office hours, unavailable Wed: 11:30a to 12:30p Thr: 9:15a to 12:30p Fri: 10:00a to 12:00p Course Syllabus can be found at: This lecture will be posted AFTER class at:

Chapter 1 Metric Conversions

Types of Conversions Two major sets of units English system ◦ Feet, miles, Fahrenheit, etc. ◦ Used primarily in the U.S. among the public population Metric 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.

S.I. to English

Rounding Always round your answer to the least precise measurement given. e.g. 5.7 cm ÷ 1.75 min = cm/min = 3.3 cm/min What about rounding up or down?

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 becomes? becomes? 25.9

Sample Problems Convert the following metric measurements to English units using exact conversion factors. Round answers to one decimal place ,792,458 meters per second ? feet per second °C ? °F 3.6, kilometers ? Miles?

Chapter 2 Location

Latitude & Longitude Locations 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, 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, cont. From 0 ° to 90° From 0° to 180°

Where is 78 °S, 106°E

Where is 32 °N, 13°E

Latitude & Longitude, 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 46 ° 24’ 30” N, 105° 40’ 24” W