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Lecture_04_100411

# Lecture_04_100411 - Lecture 4 Problem Solving Goal Learn to...

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Lecture 4: Problem Solving Goal: Learn to write conversion factors for two units that describe the same quantity and use the conversion factors to change from one unit to another Outline (Timberlake Chapter 1.6-1.7): - Writing Conversion Factors (1.6) - Problem Solving (1.7) Problems for Extra Practice: 1.45, 1.47, 1.49, 1.51, 1.53, 1.55, 1.57, 1.59, 1.61

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Equalities Equality is a relationship between two units that measure the same quantity Can be written for relationships between units of the metric system, between U.S. units, or between metric and U.S. units 1 m = 100 cm (metric barb2right metric) 1 lb = 16 oz. (U.S. barb2right U.S.) 1 in = 2.54 cm (U.S. barb2right metric) Equalities between units of the same system are definitions with numbers that are exact . Example: 1 cm = 10 mm different systems (metric and U.S.) are measurements with numbers that are significant figures . Example: 1 qt = 946 mL (measured)
Some Common Equalities

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Equalities on Food Labels The contents of packaged foods in the U.S. are listed in both metric and U.S. units indicate the same amount of a substance in two different units
A conversion factor is a fraction obtained from an equality Equality: 1 in. = 2.54 cm is written as a ratio with a numerator and denominator can be inverted to give two conversion factors for every equality Conversion Factors 1 in. 2.54 cm 2.54 cm 1 in. and

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Conversion Factors Conversion factor is a ratio in which the numerator and the denominator are quantities from an equality or a given relationship Equality Conversion Factors 1 km = 1000 m 1 km 1000 m 1000 m 1 km and 1 gallon = 4 qt 1 gallon 4 qt 4 qt 1 gallon and 1 kg = 2.20 lb 1 kg 2.20 lb 2.20 lb 1 kg and
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Lecture_04_100411 - Lecture 4 Problem Solving Goal Learn to...

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