# lecture02 - Announcements • Reminder class participation...

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Unformatted text preview: Announcements • Reminder- class participation starts on wednesday • Students with last names starting with A-BAR should pick up name tags at the start of class on wednesday, and sit in the front row • Prof. Barth will not be having ofFce hours this Tuesday Units of Measurement • Length : meter (m) • 1 m = 39.37 inches • Mass : gram (g) • 1000 g weighs 2.2 pounds (on earth) • Time : second (s) • Temperature : Kelvin (K) • K = Celsius (or Centigrade) temperature + 273 • 0 K = absolute zero Prefxes For large and small numbers • (G) Giga = 1,000,000,000 = 10 9 • (M) Mega = 1,000,000 = 10 6 • (k) kilo = 1000 = 10 3 • (c) centi = 1/100 = 10-2 • (m) milli = 1/1000 = 10-3 • ( μ ) micro = 1/1,000,000 = 10-6 • (n) nano = 1/1,000,000,000 = 10-9 Prefxes For large and small numbers • (G) Giga = 1,000,000,000 = 10 9 • (M) Mega = 1,000,000 = 10 6 • (k) kilo = 1000 = 10 3 • (c) centi = 1/100 = 10-2 • (m) milli = 1/1000 = 10-3 • ( μ ) micro = 1/1,000,000 = 10-6 • (n) nano = 1/1,000,000,000 = 10-9 Learn and remember these defnitions: we will use them oFten. Units for Large Distances Units for Large Distances • 1 Astronomical Unit = mean distance between earth and sun • 1 AU = 1.496 × 10 11 m • Eris, the most distant detected object in our Solar System, is currently 97 AU away from the Sun • The nearest star to the sun (Proxima Centauri) is 266,000 AU away! Units for Large Distances • 1 Astronomical Unit = mean distance between earth and sun • 1 AU = 1.496 × 10 11 m • Eris, the most distant detected object in our Solar System, is currently 97 AU away from the Sun • The nearest star to the sun (Proxima Centauri) is 266,000 AU away! Note: For exams, you don’t need to memorize numerical values for quantities like this, but you do need to know what they mean and how to use them. Units for Large Distances Units for Large Distances • 1 light-year = distance traveled by light in 1 year • 1 LY = 9.46 × 10 15 m Units for Large Distances • 1 light-year = distance traveled by light in 1 year • 1 LY = 9.46 × 10 15 m • 1 parsec (1 pc) = 3.26 LY (we’ll Fnd out why later on) Units for Large Distances • 1 light-year = distance traveled by light in 1 year • 1 LY = 9.46 × 10 15 m • 1 parsec (1 pc) = 3.26 LY (we’ll Fnd out why later on) Units for Large Distances...
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lecture02 - Announcements • Reminder class participation...

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