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**Quiz**• How many significant figures are there in the number 45.07 cm? (5 points) • Express the operations correctly (5 points each) a. 34.56 cm + 3 cm = b. 34.56 cm X 3 cm =**Dimensions, Units, Metric System, Dimensional Analysis**Homework: Skim Ch. 1. Complete the handout**I. Dimensions.**Physics is a science founded on observation and measurement. Measurements are used to convey information gained about the world around us. ____________ are measurable physical properties.**I. Dimensions.**Physics is a science founded on observation and measurement. Measurements are used to convey information gained about the world around us. Dimensions are measurable physical properties.**Here are a few examples:**Length, Time, Mass, Charge, Temperature, Rate, Speed**Dimensions are divided into two types, ____________ and**____________. Fundamental dimensions are just as their name indicates, these are the basic building blocks used to set the framework of measurements.**Dimensions are divided into two types, fundamental and**derived. Fundamental dimensions are just as their name indicates, these are the basic building blocks used to set the framework of measurements.**We will use only three basic building blocks for the entire**first semester: ______, ____, and ____. Each of these is defined in section one of the text.**We will use only three basic building blocks for the entire**first semester: length, mass, and time. Each of these is defined in section one of the text.**Derived dimensions are made of combinations of fundamental**dimensions. Here are some examples: area = (length)2,volume = (length)3**II. Units. Units are ____________ values given to the**dimensions above. Standardization is necessary; else measurements can easily become meaningless. These are three main systems used today: _____, _____, and the _______ system**II. Units. Units are standardized values given to the**dimensions above. Standardization is necessary; else measurements can easily become meaningless. These are three main systems used today: _____, _____, and the _______ system**II. Units. Units are standardized values given to the**dimensions above. Standardization is necessary; else measurements can easily become meaningless. These are three main systems used today: m k s, c g s, and the british system**The first two are part of the metric system, a system built**off of powers of 10. SI, or mks, is the current standard.**The mks stands for _____, ________, and ______, representing**length, mass, and time**The mks stands for meter, kilogram, and second, representing**length, mass, and time**The other, older system is cgs, which stands for __________,**____, and ______.**The other, older system is cgs, which stands for centimeter,**gram, and second.**Each of the units has the same set of multipliers, allowing**each unit to be increased or decreased in amount by factors of ten. These are the multipliers that you must memorize:**The main benefit of the metric system is that it is ______,**___________, and _____________________. Here are some examples of the usage of the prefixes:**The main benefit of the metric system is that it is simple,**easy to use, and based on powers of 10. Here are some examples of the usage of the prefixes:**The main benefit of the metric system is that it is simple,**easy to use, and based on powers of 10. Here are some examples of the usage of the prefixes: kilogram = 1000 grams millimeter = 0.001 meter decibel = 0.1 bel**III. Dimensional Analysis:**Dimensional analysis refers to the process of converting one set of units into another. Here are a few examples:**The conversions between metric and British units are not as**easy. The conversions are actually definitions, and are considered exact. Highlight these for memorizing! 1 foot = 12 inches, 1 yard = 3 feet = 36 inches, 1 mile = 5280 feet 1 inch = 2.54 cm, 1 liter = 1000 cc = 1000 cm3, 1 gallon = 4 quarts 1 day = 24 hours, 1 hour = 60 minutes = 3600 seconds 1 micron = 1 micrometer = 1 μm, The density of water = 1.000 g/cm3.**Example #1: How many inches are in 0.00435 mile?**Don’t forget proper significant figures!**Example #2: How many firkins can be held in one hogshead?**Since all conversions are exact, this is considered an exact computation.