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Topic: Action (physics)

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In the News (Tue 20 Aug 19)

  Info and facts on 'Action (physics)'   (Site not responding. Last check: 2007-11-07)
In physics (The science of matter and energy and their interactions), the action principle is an assertion about the nature of motion, from which the trajectory of an object subject to forces can be determined.
The action is a scalar (A variable quantity that cannot be resolved into components) (a number) with the unit of measure (additional info and facts about unit of measure) for Action as energy time.
The action principle is a scalar theory, with derivations and applications that employ elementary calculus.
www.absoluteastronomy.com /encyclopedia/a/ac/action_(physics).htm   (1915 words)

 Action at a distance (physics) - Open Encyclopedia   (Site not responding. Last check: 2007-11-07)
In physics, action at a distance is the instantaneous interaction of two objects which are separated in space; the term was coined as "spooky action at a distance" by Albert Einstein.
Current physical theories incorporate the principle of relativity as one of their basic building blocks, hence ruling out action-at-a-distance.
At the same time however, action at a distance appears to be an essential feature of some very fundamental quantum mechanical effects like entanglement and quantum nonlocality.
open-encyclopedia.com /Action_at_a_distance_(physics)   (205 words)

 Encyclopedia: Action at a distance (physics)   (Site not responding. Last check: 2007-11-07)
In physics, action at a distance is the interaction of two objects which are separated in space with no known mediator of the interaction.
At the same time however, instantaneous action at a distance appears to be an essential feature of some very fundamental quantum mechanical effects like entanglement and quantum nonlocality.
The question of whether this 'spooky action' at a distance constitutes a violation of the relativistic upper limit on the propagation of interaction is not straightforward.
www.nationmaster.com /encyclopedia/Action-at-a-distance-(physics)   (433 words)

 Action (physics)   (Site not responding. Last check: 2007-11-07)
The principle is also called the principle of stationary action and also Hamilton's principle or (less general and in fact incorrect) the least-action principle and the principle of minimal action.
The Principle of Least Action was first formulated by Maupertuis [1] in 1746 and further developed (from 1748 onwards) by the mathematicians Euler, Lagrange, and Hamilton.
More generally, an action is a functional from the configuration space to the real numbers and in general, it needn't even necessarily be an integral because nonlocal actionss are possible.
www.sciencedaily.com /encyclopedia/action__physics_   (1430 words)

 Action - Wikipedia, the free encyclopedia
Action (comic), a British comicbook of the 1970s.
Action movie, a film genre that focus on spectacle and violence over complex plotting.
Action, the name of a single by the band Powerman 5000 from the album Transform.
www.wikipedia.org /wiki/Action   (162 words)

 theology > white paper > 3 physics > 1 action
Actions of one kind pass out to external matter, as to heat or to cut; whilst actions of the other kind remain in the agent, as to understand, to sense and to will.
Finally, and this is one of the foundations of physics, action is quantified, the quantum of action being represented by Planck's constant.
Physics still has far to go to come to terms with this amazing fact and what it means for man and his relation to the universe.
www.physicaltheology.com /Theory/T03_Physics/phys01Action.html   (1954 words)

 Action (physics)   (Site not responding. Last check: 2007-11-07)
The action is a scalar (a number) with the dimension of Energy time.
In Lagrangian mechanics, the trajectory of an object is derived by finding the path for which the action integral is stationary (a minimum or a saddle point).
The action integral is a functional (a function depending on a function, in this case).
www.brainyencyclopedia.com /encyclopedia/a/ac/action__physics_.html   (1513 words)

 Call for action on physics decline   (Site not responding. Last check: 2007-11-07)
Entry statistics accompanying this year's exam results showed that 28,119 students had opted for physics this year, a 2% drop on last year when 28,698 pupils chose the subject.
The fall in the number of pupils studying physics, and the small rise in other science subjects, showed there was work still to be done.
He said he felt a combination of factors was responsible for the decline and urged the Government to pay maths and physics teachers more while improving the careers advice offered to students.
www.tiscali.co.uk /news/newswire.php/news/pa/2005/08/18/technology/callforactiononphysicsdecline.html&template=/technology/feeds/pa_story_template.html   (312 words)

 AllRefer.com - momentum (Physics) - Encyclopedia
When no external force acts upon a body in motion or a system of bodies there is no change in the total momentum even though, as in the case of a system of bodies, there may be an internal disturbance of the system resulting in changes in the momenta of individual bodies.
This conclusion is commonly known as the principle of the conservation of momentum (see conservation laws, in physics).
The distance to which the pile is driven depends upon its kinetic energy; the length of time required for the action to cease, upon its momentum.
reference.allrefer.com /encyclopedia/M/momentum.html   (411 words)

 Action (physics) - Wikipedia, the free encyclopedia   (Site not responding. Last check: 2007-11-07)
The action is a scalar (a number) with the unit of measure for Action as Energy × Time.
ymmetries in a physical situation can better be treated with the action principle, together with the Euler-Lagrange equations which are derived from the action principle.
For example, Noether's theorem which states that with every continuous symmetry in a physical situation there corresponds a conservation law (and also the converse).
www.wikipedia.org /wiki/Action_%28physics%29   (1618 words)

 Pipe organs: physics in an action (December 2002) - Physics World - PhysicsWeb
One of the most crucial parts of the organ is the "action" ­ the mechanism that links the keys and the pipes.
If the action is badly designed, then the instrument can be difficult to play or may even be unplayable.
However, the spring is often not strong enough to overcome the inertia of the action, which prevents the pallet from closing quickly enough.
www.physicsweb.org /article/world/15/12/5   (449 words)

 Modeling Instruction Program
Modeling Instruction in Physics was recognized in 2000 by the U.S. Department of Education as one of the seven best K-12 educational technology programs out of 134 programs evaluated.
Modeling Instruction in Physics was recognized in 2001 by the U.S. Department of Education as one of two exemplary programs in K-12 Science Education.
A proposal to stimulate action by the physics community submitted by David Hestenes to the AAPT.
modeling.asu.edu   (426 words)

 Physics Blog   (Site not responding. Last check: 2007-11-07)
Physics World asked readers to send them their nominations for the "greatest equations ever." You may be surprised by the results.
Professor Tony Leggett was announced as the 2003 Nobel Laureate in Physics "for pioneering contributions to the theory of superconductors and superfluids".
The physics of water polo is cool for sports enthusiasts, and the physics of water resistance may interest those who like water aerobics, but the physics of water pistols is more like the summer fun happening in my neighborhood.
www.physics.uiuc.edu /blog.htm   (9794 words)

 [No title]   (Site not responding. Last check: 2007-11-07)
Visual physics links to see physics explained using computer graphics and animations.
A Physics dictionary that you can contribute to.
Are you a student in a physics class?
www.fearofphysics.com   (61 words)

 Physics   (Site not responding. Last check: 2007-11-07)
Physics majors seek to understand the laws that govern the universe.
Physics is the scientific study of matter and energy.
In addition to lectures, you’ll attend labs where you’ll see physics in action and discussion sections where you’ll solve word problems with the rest of the class.
www.collegeboard.com /csearch/majors_careers/profiles/majors/100609.html   (315 words)

 Frederick Guthrie: a man of action (November 1999) - Physics World - PhysicsWeb
Guthrie's strong belief in the importance of exchanging ideas and his enthusiasm for communicating physics led directly to the founding of the Physical Society of London, the forerunner of the present-day Institute, in 1874.
A man of action rather than words, Guthrie became the Society's demonstrator and was only persuaded to assume the presidency ten years before his death.
In the November issue of Physics World magazine, Dianne Stilwell of the Institute of Physics recalls the life and times of Frederick Guthrie.
physicsweb.org /article/world/12/11/10   (216 words)

 bader   (Site not responding. Last check: 2007-11-07)
Feynman had first come on the principle of least action in Far Rockaway, after a bored hour of high-school physics, when his teacher, Abram Bader, took him aside.
At any particular moment the action might rise or fall, but when the ball arrived at its destination, the path it had followed would always be the path for which the total action was least.
It is almost impossible for a physicist to talk about the principle of least action without inadvertently imputing some kind of volition to the projectile.
www.physics.utoledo.edu /~ljc/bader1.html   (663 words)

 The Physics Classroom
In the second unit of The Physics Classroom, Newton's third law of motion was introduced and discussed.
This is a common misconception that has been addressed elsewhere in The Physics Classroom.
The male figure skater experiences a backwards (you might say "negative") force which causes his backwards (or "negative") acceleration; that is, the man slowed down while the woman sped up.
www.physicsclassroom.com /Class/momentum/U4L2a.html   (1392 words)

 Physics In Action   (Site not responding. Last check: 2007-11-07)
One clear example of PHYSICS IN ACTION was the record for power lifting.
There is a lot of physics involved in weight lifting.
This problem is a great one to show how physics is applied to many everyday things such as weight lifting.
www.glenbrook.k12.il.us /gbssci/phys/projects/frig/piabycbu/pia1.html   (249 words)

 A Glossary of Frequently Misused or Misunderstood Physics Terms and Concepts.
Unfortunately the word action persists in textbooks in meaningless statements of Newton's third law: "Action equals reaction." This statement is useless to the modern student, who hasn't the foggiest idea what action is. See: Newton's 3rd law for a useful definition.
In physics and chemistry the word specific in the name of a quantity usually means divided by an extensive measure that is, divided by a quantity representing an amount of material.
In physics a theory usually takes the form of an equation or a group of equations, along with explanatory rules for their application.
www.lhup.edu /~dsimanek/glossary.htm   (9783 words)

 Apr 08: Newtonian physics, electromagnetism, action at a distance   (Site not responding. Last check: 2007-11-07)
Newtonian or classical physics is reductionist, holding that all physical reality can be reduced to a few particles and the laws and forces acting among them.
Newtonian physics is free of spiritual or psychological forces = emphasis on objectivity.
However, this attempt to resolve the action at a distance paradox uses a particle nature to light, when observation of interference patterns clearly shows that light has a wave-like nature.
blueox.uoregon.edu /~karen/astro123/lectures/lec04.html   (363 words)

 Gourt :: Science :: Physics
Physics and Astronomy Classification Scheme (PACS): Hierarchical numbering scheme, developed by the American Institute of Physics, used to identify fields and sub-fields of physics.
Physics Central: A page on modern physics, such as quantum mechanics and fl holes, and some mathematics.
Physics on MathPages: Articles, leaning towards a mathematical description, on a wide range of topics in physics.
science.gourt.com /Physics.html   (462 words)

 DerKeiler Directory - /Science/Physics   (Site not responding. Last check: 2007-11-07)
We describe the latest research and the people who are doing it and show you physics in action.
Hierarchical numbering scheme, developed by the American Institute of Physics, used to identify fields and sub-fields of physics.
Serves information from physics departments and institutes worldwide: departmental information, locally stored documents, authoring tools, free access journals, jobs, conferences and education material.
directory.derkeiler.com /Top/Science/Physics   (304 words)

 How Things Work - How Things Work Home Page
Despite all this physics reality, salespeople and con artists are still more than happy to sell you protection against the dangers of modern life.
That's because you are doing physical work on the coffee by pushing it around as it moves in the direction of your push.
I am being assured by very reputable scientists (Professors of Physics in American and European universities) that centrifugal force is a fictitious force, even though the action of a centrifuge is defined as depending upon it.
howthingswork.virginia.edu   (20542 words)

 Emergency Action Plan: Physics Department
Assemble at the area designated in your departmental Emergency Action Plan (see back) and remain there until instructed by Public Safety or the fire department that it is safe to re-enter the building.
A fire emergency is defined as (1) an uncontrolled fire or imminent fire hazard, (2) the presence of smoke or the odor of burning, (3) the uncontrolled release of a flammable or combustible substance, or (4) a fire alarm sounding.
Additional information on emergency action planning can be found in the Princeton University Health & Safety Guide, on the Environmental Health and Safety (EHS) web page (www.princeton.edu/~ehs), or by contacting Kelly States, Health and Safety Specialist (8-2648) or the University Fire Marshall (8-6805).
physics.princeton.edu /www/jh/emergency_procedures.html   (1413 words)

 Physics Today May 2002
They found that the problems facing women in physics depend on the economy and society in which they work, but that some problems cut across countries and cultures.
Among the universal challenges experienced by women physicists are the balancing of career with housework and child rearing, discrimination in the workplace, professional isolation, and a lack of representation at all levels of decision making.
A delegate from India, for example, reported that, in her country, physics is not seen as unfeminine; indeed, for women, earning a master's degree is considered advantageous for marriage, but continuing to a PhD is not.
www.physicstoday.org /pt/vol-55/iss-5/p24.html   (1434 words)

 physics central physics in action - the little constant that couldn't
physics central physics in action - the little constant that couldn't
Physicists measure the values of basic quantities like the speed of light and the charge of the electron.
Quasar spectra recorded at the Keck Observatory in Hawaii imply that a fundamental physical constant may have been increasing slightly over the past six billion years.
www.psrc-online.org /items/Load.cfm?ID=548   (212 words)

 Watching biology in action (June 2002) - Physics World - PhysicsWeb
In PET, tiny amounts of a biologically interesting molecule are labelled with a radionuclide that decays by emitting a positron.
This system consists of four large detectors, each containing a stack of wire chambers interleaved with a sandwich of thin lead plates that are drilled with a fine matrix of holes.
The impact of physics on biology and medicine
physicsweb.org /article/world/15/6/7   (4420 words)

 Physics Classes
Physics as a scientific discipline is fundamentally concerned with the physical relationships that exist between matter, motion and energy.
The bicycle is the most efficient mode of transport devised by humans up to this point in time and is packed with physics concepts.
From the physics viewpoint, a high power (wattage) to weight ratio of the rider and bike coupled with an efficient gearing mechanism, increase the efficiency of energy conversion from the rider (stored chemical potential) to kinetic (moving) energy of the bike.
webpages.charter.net /fawcett3/physics.htm   (527 words)

 Science In Action: The Physics of Shopping
A report in today's issue of Physical Review Letters shows that the sales of popular books on Amazon.com can be partly explained by complex-systems models.
Here is a press release that tries to use more English.
If we can model the motions of planets, moons and probes, maybe we can model the behavior of groups of book-buyers, if we can find the patterns that predict their actions.
sxxz.blogspot.com /2004/11/physics-of-shopping.html   (388 words)

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