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Unformatted text preview: Atomic Theory Question of the Day What is energy? What is the relationship of Kinetic Molecular Theory and atoms? How does light express the atomic structure? Before Atomic Theory James P. Joule 1818  1889 Born to a brewery family in Salford, Lanchsire, England Studied at home and published many papers on heat transfer Became the head of the Joule Brewery Combined the effort many scientists to create Kinectic Theory Wikipedia: http://en.wikipedia.org/wikiJames_Prescott_Joule/ Energy First, What is Work? A force through the distance. W = F*d Units of Work 1 unit of work = 1 N * 1m 1 kg m 2 /s 2 = 1 Joule Power 1 unit of power = 1 Work / time 1 Joule/ Second = 1 Watt Power Power is a unit of energy over time. Like water flowing out of a pipe. Power: 1Watt Seconds Joules Power T E Time Energy P = = = = Kinetic Energy 2 2 2 2 2 2 2 2 2 2 2 2 1 2 1 2 1 2 1 2 1 m v W t t v m W t m a W a t m a W t v a t v a a t d m a F F d W = = = = = = = = = Potential Energy m g h W g a m a F h d F d W = = = = = Kinetic Energy of Car The car from last lecture is moving at 30 m/s. What is the kinetic energy of the car? J s k g m W s m k g W m v W s m v k g m 0 0 0 , 9 0 / 0 0 0 , 9 0 ) / 3 0 ) ( 0 0 0 , 2 ( 2 1 2 1 / 3 0 0 0 0 , 2 2 2 2 2 = = = = = = Kinetic Energy of a Plane The plane from the last lecture is going at 65 m/s. What is the kinetic energy of the plane? Potential Energy of a Car What is the potential energy of the above car when it is on a hill of 300 m? J W s k g m W m s m k g W m g h W m h k g m 0 0 0 , 8 8 0 , 5 / 0 0 0 , 8 8 0 , 5 ) 3 0 0 ) ( / 8 . 9 ) ( 0 0 0 , 2 ( 3 0 0 0 0 0 , 2 2 2 2 = = = = = = Potential Energy of a Plane The above plane is traveling at an altitude of 2,000 m above ground level. What is the potential energy of the plane? Conservation of Energy Energy is never created or destroyed. Energy can be converted to one form to another but the total energy remains the same. Work against: Inertia: conserved Gravity: conserved Friction: not conserved, heat released Shape: not conserved, heat transferred Kinetic Molecular Theory Democritus (5 th Century B.C.) Introduced atoms Rejected by Arstotle Elements represented by earth,wind,fire, and air Galileo and Newton suggested he might be right, but not confirmed Kinetic Molecular Theory KMT (cont.) Molecules Made of atoms Compounds like H 2 Smallest compound components...
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 Fall '09
 Howard
 Galaxies

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