# Shared Flashcard Set

## Details

Chapter 6 Physics Dymestified
Units and Constants
54
Physics
Not Applicable
04/11/2007

Term
 Meteric System: what are the units it uses, and the alternate name?
Definition
 Meter-kiligram-second system, International System
Term
 Name the system of unites, from the most common system to least common system.
Definition
 Mertric (International), Centimeter-gram-second, and English.
Term
 English System: what are the units it uses? (3)
Definition
 foot-pound-second
Term
 What is a base unit?
Definition
 Each system has several fundamental units, those are called base units. All other units of measurement are derived from the base units.
Term
 What is SI?
Definition
 SI stands for Systeme International in French. It is the Internation Systems abbreviation.
Term
 When was the SI created, and who defines it now?
Definition
 The SI system was created in the 1800's, and is now defined by the Genral Conference on Weights and Measures.
Term
 What are the units of measure in the SI system?
Definition
 Meter, Kilogram, Second, Kelvin, Ampere, Candela, and Mole.
Term
 What does the meter measure?
Definition
 Distance.
Term
 What does the Kilogram measure?
Definition
 Mass.
Term
 What does the second measure?
Definition
 Time.
Term
 What does the Kelvin measure?
Definition
 Temperature.
Term
 What does the Ampere measure?
Definition
 Electric Current.
Term
 What does the Candela measure?
Definition
 Brightness of Light.
Term
 What does the Mole measure?
Definition
 Amount of Matter in terms of atoms.
Term
 What is the CGS system?
Definition
 Centimeter-gram-second System.
Term
 What are the base units of the CGS?
Definition
 Centimeter, Gram, Second, Celsius, Ampere, Candela, Mole.
Term
 If it is 0 degrees Celcius, what is the tempurature in Kelvin, rounded to the nearest degree?
Definition
 -273 degrees Kelvin.
Term
 What are the four base units used in the three basic unit systems?
Definition
 Second, Ampere, Candela, and Mole.
Term
 What was the origianal meter defined by, and where is this object kept?
Definition
 The meter was designated as the distance between two scratches on a platinum bar on display in Paris, France.
Term
 What was the original IDEA of the meter?
Definition
 There should be a million meters stretching from the north pole and the equator and passed through Paris.
Term
 What is the approximate number of meters it takes to go around the world?
Definition
 40 million.
Term
 What is the meter defined as in terms of light traveling through a perfect vacuum.
Definition
 It takes light (3.33562095)(10^-7) seconds to travel a meter through a perfect vacuum.
Term
 What is the symbol for meter?
Definition
 The lowercase nonitalicized English letter m.
Term
 What is the abbrivation for the kilogram?
Definition
 The lowercase nonitalicized pair of Engish letters kg.
Term
 What was the kilogram originally defined as?
Definition
 The mass of .001 cubic meter of pure liquid water.
Term
 What is the new measurement for a kilogram? Where is it kept?
Definition
 The mass of a sample of plantinum-iridium alloy. It is kept under lock and key at the International Bureau of Weights and Measures.
Term
 What is the difference between mass and weight?
Definition
 No matter where something is, it will always have the same mass, but the weight will very depending on the gravitational pull.
Term
 What is the definition of weight?
Definition
 The force exerted by gravitation or acceleration on a given mass.
Term
 In space, what is the mass of anything?
Definition
 Zero. In space, everything is weightless.
Term
 What is the symbol for second?
Definition
 The symbol for the lowercase nonitalicized English letter s.
Term
 What fraction of a day is a second?
Definition
 1/86,400
Term
 What is the modern day definition of a second?
Definition
 The time it takes for one cesium atom to oscillate through (9.192631770)(10^9) complete cycles.
Term
 What is a way of measuring a second in terms of light?
Definition
 A second is how long it takes a ray of light to travel (2.99792458)(10^8) meters.
Term
 Approximately how many seconds would it take light to reach the moon?
Definition
 1.25
Term
 What is the symbol for Kelvin?
Definition
 The uppercase and nonitalicized letter K.
Term
 What is the kelvin?
Definition
 The Kelvin measures how much heat exists realtive to absolute zero.
Term
 What is absolute zero?
Definition
 It represents the absence of all heat.
Term
 What tempeture does pure what freeze at sea level? Boils? (in Kelvin)
Definition
 273.15, 373.15
Term
 In terms of water, what is a triple point?
Definition
 The point at which it can exist as water, steam, and ice.
Term
 What is the symbol for an Ampere? What is the abbrivation for the Ampere?
Definition
 Teh uppercase nonitalicized English letter A. Abbreviated as amp.
Term
 What is 1 A measured as?
Definition
 1 A is equivalent to the flow of (6.241506)(10^18) electrons per second past a given fized point in an electrical conductor.
Term
 What is the formal definition of the A? (IT'S REDICULUS!)
Definition
 1 A is the amount of constant charge-carrier flow through two straight, parallel, infinitely thin, perfectly conducting media placed 1 m apart in a vacuum that results in a force between teh conductors of 2(10^-7) newtons per linear meter.
Term
 What are the two problems with the definiton of an A?
Definition
 1.) A newton is not defined yet, and 2.) The definition gives an impossible situation to create in the real world.
Term
 What is said about Mathematicans and Physicists?
Definition
 They can't live with each toher and they can't live without each other. Just like men and women.
Term
 What is the symbol for the Candela?
Definition
 The nonitalicized pair of English letters cd.
Term
 What is a cd equivalent to?
Definition
 It is equivalen to 1/683 of a watt of radiant energy emitted at a frequency of 5.4 (10^14) Hertz in a solid angle of one steradian.
Term
 waht is 1 cd approximately equivalent to?
Definition
 The light emitted by a candle.
Term
 What is a more exact defition than the candle, for a cd?
Definition
 1 cd represents the radiation from a surface area of 1.667(10^-6) square meter of a perfectly radiating object called a blackbody at the solidification temperature of pure platinum.
Term
 What is the symbol for a mole?
Definition
 The lowercase nonitalicized English letters mol.
Term
 What is another name for the mole?
Definition
Term
 What is the mole approximately equal to?
Definition
 6.022169(10^23).
Term
 What is significant about 6.022169(10^23), in terms of matter equivalence?
Definition
 It is the number of atoms in precisely .012kg of carbon-12, the most common isotope of elemental carbon.
Term
 In most cases, the italicized letter represents _____, _____, or a _____. When a letter is nonitalicized in almost alway represents a _____ _____.
Definition
 Constant Variable Coefficient Phycial Unit
Term
 What is the radian a standard unit of?
Definition
 Plane angular measure.
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