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Concepts week 6 notes

by: kmb0095

Concepts week 6 notes SCMH 1010 - 002

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concepts notes
Concepts of Science
Allen Lee Landers
Class Notes
Concepts of Science
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This 3 page Class Notes was uploaded by kmb0095 on Friday February 19, 2016. The Class Notes belongs to SCMH 1010 - 002 at Auburn University taught by Allen Lee Landers in Spring 2016. Since its upload, it has received 34 views. For similar materials see Concepts of Science in Science at Auburn University.


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Date Created: 02/19/16
Week 6 2/15/16  Radiation (cont’d) o Electromagnetic waves (usually IR) o Come about from the charges in the atoms and/or molecules of a material o Essentially light, charges that move around give off these waves that are pure energy The mode of heat transfer that takes advantage of differences in density is: convection Liquid Nitrogen boils at a temperature of 77K. This corresponds to: -321 F (77 – 273 = -196 C, which is 9/5(-196) + 32)  Second law of thermodynamics (tendency for disorder) o More likely to go to disorder than to go to order o 3 statements of the law  heat does not flow spontaneously from cold to hot  no engine can exclusively convert heat to work  when we talk about efficiency of engines, and temperature of various types of fuels, our discussion is based on the fact that every engine reaches a highest and a lowest temp in its working cycle  high temp creates a high temp reservoir (T ) hot  low temp created a low temp reservoir (T cold  Eff (%) = 100*(T hot– Tcold / hot o T hot= 350 C = 623 K Tcold= 100 C = 373 K Eff = (623K – 373K) / 623K *100 = 40% If we were to somehow able to manufacture a heat engine that operated at 100% efficiency, what would we say about the temps of the hot and cold reservoirs? The hot reservoir can be at any temp while the cold reservoir is at 0K  every isolated system tends toward disorder (your room will not clean itself)  ordered system o regular predictable pattern  disordered system o random  entropy o measure of disorder o the entropy of an isolated system remains constant or increases (will always become more disordered) Which of the following is NOT a statement from the Second law? Living things must be able to absorb heat from their environment by radiation Water (H 2) is at lowest entropy (least disordered) when it is in the form of: ice 2/19/16 Ch.5 (not on exam 1)  electricity and magnetism are two different aspects of one force – the electromagnetic force  static electricity o Newton’s First Law – a stationary object will remain at rest, unless acted upon by an unbalanced force  If one rubs a sheet of plastic with a cloth, the plastic will be able to attract small pieces of paper, and lift them off a table. By Newton’s First Law, there has to be a new force acting on the paper o Greek’s Observations  Electrical charge (Thales) o Electricity  Static electricity o Two kinds of electrical charges  Metal spheres with opposite charges are attracted to each other  Metal spheres with same charge are repelled from each other  Science in the making o Benjamin Franklin and the electrical charge  Key on a kite  Did it really happen?  Mythbusters tried to replicate the experiment, and concluded that Franklin would have been fried if he had done the experiment as described  Movement of electrons o Atomic structure  Nucleus, neutrons, protons, electrons To achieve a negative charge, you would most likely: add electrons o Electric charge  Positive  Negative o Behavior  Coulomb  Experiments  Coulomb’s Law o Force is related to charge and distance o F = kq q 1 2 2  q = amount of charge o a charge of 1 Coulomb = 6.3 x 10 18electrons  the electrical field o the force felt by a charge located at a particular point


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