Objectives:Define: Precision and

AccuracyAnd Life in the Universe

Review Unit Conversion and Dimensional Analysis

Physics ILesson Three

Warm up:-How many years does it take to “Tick Off” 1 BILLION (109 ) Seconds?

Homework:Come up with YOUR VALUES and complete the Drake Equation

Read Study Guide Pg 23 Begin YOUR SUMMARY SHEET Page 24 Problem #’s 31-45 Odd

If the Earth is 1.496 X 1011 meters from the sun, traveling in a circle around the Sun. How fast is the Earth moving through space? In m/s? In Miles per hour?100,000 meters per 62miles. 3.600 X 103 seconds/hr

Split Page Notes Introduction Chapter 1

Read Summary Pg 23Significant Digits (Pg 7)

Scientific NotationAccuracy Vs Precision: Targets pg

12-13

PREVIEW

Warm Up: If the Earth is 1.496 X 1011 meters from the sun, traveling in a circle around the Sun. How fast is the Earth moving through space in m/s?

In miles per hour {mph}?100,000.0 meters per 62.00miles.

3.600 X 103 seconds /hr

Lesson 3 AObjectives:

- Estimation- Deductive

Reasoning- Insight- Are we Alone?

Homework: Come up with YOUR VALUES and complete the Drake EquationRead Study Guide Pg 23 Begin YOUR SUMMARY SHEETPage 24 Problem #’s 31-45 Odd

Warm Up: If the Earth is 1.496 X 1011 meters from the sun, traveling in a circle around the Sun. How

fast is the Earth moving through space in m/s? In miles per hour {mph}?

100,000.0 meters per 62 miles. 3.600 X 103 seconds /hr

O Velocity = distance / timeO Distance = 2πr = 2π {1.496 X 1011 meters}

O = 9.3996 X 1011 meters O Time = 365.26 daysO = 31.56 X 1011 secO Velocity

O = 9.3996 X 1011 meters / 31.56 X 1011 secO = 2.978 3 X 1011 meters / sec

O [2.9783 X 1011 meters / sec] * [3600 sec/hr] *[62 miles/100,000.0 meters]

O = 6.675 46 X 104 mph

Drakes Equation: Is there life out there?

http://www.pbs.org/wgbh/nova/origins/drak-flash.html

Drakes Equation = Nint = Nstars * Fpl * Np * Fl * Fil* Fatc

Where:Nint = Number of advanced technical civilizations

(Capable of radio astronomy)  

Nstars = Number of Stars in the Galaxy

Fpl = Fraction of stars that have planets around themNp = Number of planets “suitable’ for Life to ariseFl = Fraction of Suitable planets that life

ACTUALLY arisesFil = Fraction of those planets that life actually arises,

that develops into “intelligent life” Fatc = Fraction of a planetary lifetime “Graced” by the

Advanced Technical Civilization