SGCh01

# Method of solution first state the problem h 275 10 9

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Unformatted text preview: m = 2.75 × 10 5 µg _______________________________________________________________________________ EXAMPLE 1.12 The Factor-Label Method The Voyager 2 mission to the outer planets of the solar system transmitted spectacular photographs of Neptune to Earth by radio signals. Radio waves, like light waves, travel at a speed of 3.00 × 10 8 m/s. If Neptune was 2.75 billion miles from Earth during these transmissions, how many hours were required for radio signals to travel from Neptune to Earth? •Method of Solution First state the problem. ? h = 2.75 × 10 9 mi The speed of light can be written as a conversion factor because 1 s of time is equivalent to 3.00 × 10 8 m of distance. 3.0 × 1 0 8 m 1s 1s 3.00 × 1 0 8 m This will convert units of distance into units of time in seconds, but first the distance must be expressed in meters rather than miles. To convert from the U.S. system to the SI, we can use 1.61 km = 1.0 mile. In general, our plan will be: distance → or t ime miles → k m → m → s → min → h Notice that the time in seconds must be converted...
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## This note was uploaded on 09/15/2009 for the course CHEM 102 taught by Professor Bastos during the Spring '08 term at Adelphi.

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