Transcription of 1-2 Unit Conversions, and Significant Figures
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1-2 Unit Conversions, and Significant Figures
Answer to Essential Question : A model is simplified version of physical situation. Using a model enables us to focus on the key elements of a particular situation, and is one way of getting a good idea of what is going on without having to consider every fine unit Conversions, and Significant FiguresIt is often necessary to convert a value from one set of units to another. To do this, we need to know the appropriate conversion factors. For instance, in Example we will make use of these conversion factors: 1 hour = 3600 seconds 1 km = 1000 m 1 mile = kmEXAMPLE unit conversionsAt the 2009 World Championships in Athletics, held in Berlin, the Jamaican sprinter Usain Bolt set a world record for the 200-meter dash by running that distance in a time of s. Assuming he ran exactly 200 m in this time, what was Usain Bolt s average speed during the race in (a) m/s; (b) km/h; (c) miles per hour?
We treat conversion factors as having an infinite number of significant figures and we remember that the minimum number of significant figures in …
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