2-10 10/21 & 10/24/11 Scientific Notation Ex 1. The sun is 93 million miles from the Earth, yet the next closest star is 270,000 times farther away. How far is the next closest star from Earth?

Scientific Notation – A number greater than 1, but less than 10 multiplied by a power of 10

Light year (lt-yr) – the distance traversed by light in one mean solar year. Approximately 5.88 trillion miles (9.46 trillion km) Ex 2. The sun is 30,000 light years from the center of our galaxy. How many miles is the sun from the center of our galaxy?

Ex 3. Convert each to scientific notation. Speed of Light: 300,000,000 m/sec B) Mass of a dust particle: .000 000 000 753 kg

Ex 4. Write in scientific notation. 48,000,000,000 .000 000 61 Ex 5. Write in standard form. 6.04 x 104 9.7 x 10-4

Homework: p. 132 #’s 2-24 even

10/24/11 Do-Nows a. Write in scientific notation. 75,000,000 .000 000 8 b. Write in standard form. 8.12 x 105 6.4 x 10-3

c. Write each in standard form and scientific notation. 50.2 million 1,567 million

Ex 6. Order the planets from smallest to largest.

Planet Radius (km) Earth 6.38 x 103 Jupiter 7.14 x 104 Mars 3.40 x 103 Mercury 2.44 x 103 Neptune 2.43 x 104 Saturn 6.0 x 104 Uranus 2.54 x 104 Venus 6.05 x 103

Evaluate and write your answer in both decimal and scientific form. Ex 7. (6.2 x 102)(8 x 103) 4,960,000; 4.96 x 106 Ex 8. (3 x 105)(6 x 102) 180,000,000; 1.8 x 108

p. 132-133 #’s 2-32 even, 37, 38

HW: p. 132 #’s 9, 26-32, even 37,38