By Denis Guedj
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Example text
88 years for Mars to complete one orbit, estimate the orbital speed of Mars in miles per hour. Sun Mars 141,000,000 mi 89. 12 cubic centimeter is spilled onto a lake. The oil spreads out in a circular shape having a diameter of 23 centimeters. Approximate the thickness of the oil film. 90. 16 grams. 3 grams, find the thickness of the gold foil. (Source: U. ) (Not to scale) 86. Size of the Milky Way The speed of light is about 186,000 miles per second. The Milky Way galaxy has an approximate diameter of 6 * 1017 miles.
4 - 5)2 - 32 - 329 55. (5 * 102)(7 * 10-4) 8 - 4 21. 29 - 5 4 - 2 6 - 42 , 23 22. 3 - 4 57. 3 * 10-2 3 * 101 58. 2 * 102 2 * 10-2 23. 213 - 12 13 - 29 + 16 24. ƒ 5 - 7 ƒ2 59. 4 * 10-3 8 * 10-1 60. 8 * 10-7 2 25. 2 4 + 9 -32 # 3 2 + 3 5 27. - 52 - 20 , 4 - 2 26. 10 , 2 , 5 + 10 5 28. 5 - (-4)3 - (4)3 56. (8 * 10-3)(7 * 101) Exercises 61–66: Use a calculator to approximate the expression. Write your result in scientific notation. 5 * 108) 61. 00095 Scientific Notation 62. 87 * 106)(34 * 1011) Exercises 29–40: Write the number in scientific notation.
Then we can determine the thickness T by using the formula T = VA. 8 on the previous page, Volume = Length * Width * Thickness. ('')''* Area It follows that Thickness = Geometry Review To find the area of a rectangle, see Chapter R (page R-1). To find the volume of a box, see Chapter R (page R-3). Volume Area . 4 = 2 cubic centimeters. 7 Area Divide weight by density. The aluminum foil is rectangular with an area of 15 * 35 = 525 square centimeters. 0038 centimeter. 1 Putting It All Together Concept Numbers play a central role in our society.