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B) A speedometer which is accurate on a level road is read on a rough road. (c) An object is weighed many times with a chipped or worn weight. (6) A clock which is losing time at a constant rate is used to time a chemical reaction. (e) A farmer looks at a field and says its area is 40 acres. Mensuration shows the field to be 35 acres. cf> A metal tape measure correct at 68 OF is used at 85 O F . (9) An unknown volume is measured several times with an accurate graduate cylinder (neglect water which adheres to the walls of both vessels) with the eyes in line with the liquid level.

1. 15 as a percent. % = 215% Note that percent may be more than 100. This means that more than one complete unit is involved. 2. Express 12 percent as a decimal. 12 To convert a common fraction to percent, convert the fraction so that its denominator is 100. The numerator of the new fraction is the percent. The common fraction may also be converted into its decimal equivalent and Rule 1 above applied. 3. [CHAP. 4 Express 6/25 as a percent. Multiply the fraction by 4/4. 4. Express 3/7 as a percent.

73. 4 x 109 m. How many orders of magnitude is the diameter of the sun greater than the diameter of the moon? 74. 10 x 10-28 g. What is its order of magnitude? 75. 77 x 102*. What is the order of magnitude of this measure? 76. The period of an infrared radiation has an order of magnitude of 10-13 sec and the period of an X-ray is 10-l' sec. How many orders of magnitude is the period of an infrared radiation greater than that of an X-ray radiation? 77. 998 x 108 m/s. 78. 673 x 10-l' N - m2/kg2. What is the order of magnitude of this constant?

### Basic Mathematics with Applns to Science and Technology [Schaum's Outlines] by H. Kruglak, et al.,

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