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Topic: Reaction (physics)

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	Reaction (physics) Encyclopedia (Site not responding. Last check: 2007-10-10)
		The reaction is one of the least understood of the basic physical concepts, perhaps because it is often poorly taught or incorrectly described in many publications (including in textbooks), or because Newton's laws of motion may appear counter-intuitive (see that article for a historical perspective or a statement of all three laws).
		The corresponding reaction is the gravitational force that mass exerts on the planet: this has nothing to do with the steel cable; in fact, the reaction exists even in the absence of the cable.
		Yet, the gravitational action and reaction remain the same, since the masses involved have not changed, and the distance between the center of mass of the object and the center of mass of the Earth is modified so slightly that any variation in the gravitational force is immeasurably small.
	www.hallencyclopedia.com /topic/Reaction_(physics).html (1304 words)

	Article_11
		In their attempts to identify reaction forces, our scientists all too often begin with the false expectation that if real, the reaction force in question should be capable of acting as the cause of some event in the predicted direction.
		In Universal Physics we recognize that the outward-directed centrifugal forces experienced on a "merry-go-round" are all acceleration/Reaction forces being caused by and providing support for the inward-directed centripetal acceleration/Action forces that are the forces responsible for causing the inward-directed centripetal acceleration of the orbiting objects.
		Since the supporting reaction force from the astronaut is only present during the astronaut's acceleration and then always a match for the rocket's variable acceleration/Action force, one is safe to conclude that the downward-directed reaction force from the astronaut is an acceleration/Reaction force.
	www.physicsnews1.com /article_11.html (7320 words)

	AllRefer.com - chain reaction (Physics) - Encyclopedia
		Proper conditions for a chain reaction depend not only on various external factors, such as temperature, but also on the quantity and shape of the substance undergoing the reaction.
		In the case of the fission of a nucleus, the reaction is begun by the absorption of a slow neutron.
		In a nuclear fission bomb, a chain reaction is started by forcing together two or more samples of fissionable material, each of less than critical mass, to form one sample of supercritical mass.
	reference.allrefer.com /encyclopedia/C/chainrea.html (479 words)

	Physics Today July 2001
		Reactions in the crystalline environment may exhibit kinetic rates similar to those measured in solution, or may be significantly slower due to restraints imposed by the crystal lattice.
		For the latter strategy--often called a steady-state experiment--the reaction is driven in the crystal using a continuous flow of a high concentration of reactants to guarantee that the majority of the reaction sites in the crystal are continuously engaged in the reaction.
		The reaction coordinate is defined by minimizing the energy of a chain of structures that are inserted between the stable intermediates.
	www.aip.org /pt/vol-54/iss-7/p33.html (3592 words)

	Diels-Alder Reaction Mechanism - Science Articles :: Physics Post (Site not responding. Last check: 2007-10-10)
		The Diels-Alder reaction is considered to be one of the most interesting and useful reactions found in organic chemistry, and is often used for the synthesis of six-membered rings.
		This experiment was based on the idea that since reactions of unsymmetrical dienes or dienophiles have been shown to have unsymmetrical transition states, there is no evidence to suggest that the same is not true for symmetrical dienes or dienophiles.
		The reaction’s activation and reaction energies as well as its stereoselectivities and regioselectivities were theoretically predicted and then compared to known experimental data.
	www.physicspost.com /articles.php?articleId=74 (1345 words)

	Brookhaven Chemical Physics
		While the field of physics generally strives to find compact and universal explanations for how the components of our universe interact, chemistry is traditionally considered an applied field of physics, celebrating and exploring the diversity of matter and its properties.
		The field of chemical physics aims to understand, predict, or control the behavior of matter in an expanding range of chemical systems—systems simple enough that accurate, trustworthy theoretical calculations of their behavior are feasible and, as a result, that any differences between experimental results and theoretical predictions could indicate something unexpected is happening.
		Neutrino physics is now a frontier topic in the search for the next generation of particle physics theories, and chemists at Brookhaven are working on designing new detectors for future neutrino experiments.
	www.bnl.gov /physics/overview/chemical.asp (990 words)

	SEQUEL OF THE UNIFICATION OF PHYSICS
		After the publication of the unification of physics, this book is an important works which open a new era in the field of physics.
		the unification of physics and the sequel of the unification of physics are accomplished by myself, which not only use the present achievement of human knowledge as reference but also summarize the human knowledge.
		I believe that the super-molecule chemical physics would be a subject crossing fundamental physics and theoretical physics and the position in physics is equal to thermodynamics.
	www.freewebs.com /seq-uni-physics (288 words)

	The Physics Classroom
		These two forces are called action and reaction forces and are the subject of Newton's third law of motion.
		In the top picture, a physics student is pulling upon a rope which is attached to a wall.
		In the bottom picture, the physics student is pulling upon a rope which is held by the Strongman.
	www.physicsclassroom.com /Class/newtlaws/U2L4a.html (861 words)

	Nuclear Weapon Physics and Design
		A fusion reaction is invariably started with a fission reaction, but unlike the fission reaction, the fusion (Hydrogen) bomb derives its power from the fusing of nuclei of various hydrogen isotopes in the formation of helium nuclei.
		The fusion reactions that occur in stars are not the same as the ones that occur in thermonuclear weapons or (laboratory fusion reactors).
		Reactions 5 and 6 are not thermonuclear reactions, strictly speaking.
	www.avhub.net /nuclearweaponphysicsdesign.htm (9240 words)

	The continuous creation of physical reality from the transmuting ether as portrayed in the subquantum kinetics physics ...
		By comparison, conventional physics and most alternative physics theories begin with mathematically quantified observations of physical phenomena at the quantum and macrophysical level and attempt to deduce physical theories based on those observations.
		The operation of these ether reactions causes wave-like field gradients (spatial concentration patterns) to emerge and form the observable quantum level structures and physical phenomena (e.g., subatomic particles with mass, charge, spin, and force field effects and electromagnetic waves).
		If this continual activity were to diminish, your physical body, your house, the Earth, the Sun, the countless planets and stars filling the vast expanse of space, in fact, all the subatomic particles and energy waves composing our physical universe would gradually dissipate, disolving into a state of uniformity.
	www.etheric.com /LaVioletteBooks/ether.html (1108 words)

	Question_5
		Some Physics texts explain that the "centrifugal" force cannot possibly exist in this example for if it does exist then when the rope is cut, the scale and brick will "fly" away in a definite outward direction and not in the tangential direction that they actually follow upon release (See Article XI: Reaction Forces).
		This means, you explain, that the scale is measuring an outward-directed centrifugal reaction force from the ball that is precisely equal in magnitude to the scale's inward-directed centripetal action force upon the ball.
		Here at Universal Physics we are free to witness the simple truth and beauty of real and true concepts, such as the a/R force of matter, that share supporting roles in the founding of the new science of Universal Physics.
	www.physicsnews1.com /question_5.html (2762 words)

	chain reaction (physics)
		In nuclear physics, a fission reaction that is maintained because neutrons released by the splitting of some atomic nuclei themselves go on to split others, releasing even more neutrons.
		Such a reaction can be controlled (as in a nuclear reactor) by using moderators to absorb excess neutrons.
		Uncontrolled, a chain reaction produces a nuclear explosion (as in an atom bomb).
	www.tiscali.co.uk /reference/encyclopaedia/hutchinson/m0005519.html (114 words)

	Physics Today February 2001
		Already, for example--and this is bad news for physics--chemistry seems to be trying to become a branch of biology, as witnessed by the recent name changes of the departments at Harvard and Cornell, from chemistry to chemistry and chemical biology.
		Physics, on the other hand, seems bent on absorbing biophysics, defined in the broadest possible sense.
		David Mermin is a professor of physics at Cornell University.
	www.physicstoday.org /pt/vol-54/iss-2/p11.html (1595 words)

	physics - meaghersclasses
		This physics video podcast 'investigating fl holes (video) april 16 07', looks at how you can determine the mass at the centre of a virtual fl hole.
		This video physics podcast 'reaction forces (video) march 4 07', looks at how we can resolve a force into its components and determine the magnitude of the normal reaction force, and explains what causes the existence of the reaction force.
		This physics podcast is the audio soundtrack of my video podcast on projectile motion ie 'projectile motion (video) feb 11 07'.
	meaghersphysics.podomatic.com (547 words)

	Understanding Physics :: Main Page (Site not responding. Last check: 2007-10-10)
		Physics ~ The science of matter and energy and of interactions between the two, grouped in traditional fields such as acoustics, optics, mechanics, thermodynamics, and electromagnetism, as well as in modern extensions including atomic and nuclear physics, cryogenics, solid-state physics, particle physics, and plasma physics.
		Physics (from the Greek, φυσικός (physikos), "natural", and φύσις (physis), "Nature") is the science of Nature in the broadest sense.
		The physics of the Stoics was, on the whole, identical with their theology, in which the formative power that makes each thing what it is and harmonizes all things was God.
	www.physics-blog.com (2519 words)

	Saturday Diary: 'Physics for Superheroes': perfect for science-challenged dads (Site not responding. Last check: 2007-10-10)
		This dose of realism comes courtesy of a fascinating book I've been reading called "The Physics of Superheroes" by James Kakalios, a physicist at the University of Minnesota who happens to be a big fan of comic books.
		I grew up being exposed to physics, although hardly any of it rubbed off on me, which is why I'm writing for this newspaper instead of doing any heavy thinking.
		But even in "The Physics of Superheroes," I had to wade through a discussion of quantum mechanics, one interpretation of which suggests the existence of parallel universes.
	www.post-gazette.com /pg/06336/742841-109.stm (986 words)

	Newton's Third Law (Site not responding. Last check: 2007-10-10)
		For every action, there is an equal (in size) and opposite (in direction) reaction force.
		In the top picture (below), a physics student is pulling upon a rope which is attached to a wall.
		In the bottom picture, the physics student is pulling upon a rope which is attatched to an elephant.
	www.glenbrook.k12.il.us /gbssci/phys/Class/newtlaws/u2l4a.html (734 words)

	Stars may be older than we think (May 2004) - News - PhysicsWeb
		The slowest reaction in the CNO cycle is the fusion of a proton with a nitrogen-14 nucleus to produce oxygen-15 and a gamma-ray.
		The rate for this reaction can be used to determine the rate at which energy is released by the CNO process and, consequently, the brightness and lifetime of a star.
		The LUNA team reproduced this reaction by colliding high-energy protons with nitrogen-14 nuclei at the Gran Sasso underground laboratory in northern Italy.
	physicsweb.org /article/news/8/5/11 (424 words)

	iRacing.com Motorsport Simulations > Technology > Physics Engine
		Physics is defined as "the study of motion and the way in which forces produce motion." A physics engine is a complex system of mathematical functions that replicates those motion-producing forces to create a three-dimensional sphere of existence, a virtual world that behaves like the real world.
		The difference between a good simulation and a great one is the sophistication and accuracy of that physics engine.
		With more than 20 racing-simulation releases (more than a dozen of which have garnered industry awards) to their credit, Dave Kaemmer and his team are experts in the mapping of multi-body systems and the calculation of forces and their effects on motion.
	www.iracing.com /technology_physics.htm (162 words)

	Identifying Action and Reaction Force Pairs (Site not responding. Last check: 2007-10-10)
		According to Newton's third law, for every action force there is an equal (in size) and opposite (in direction) reaction force.
		The baseball forces the bat to the leftt (an action); the bat forces the ball to the right (the reaction).
		An action force is stated; determine the mutual reaction force that forms the action-reaction force pair.
	www.glenbrook.k12.il.us /gbssci/phys/Class/newtlaws/u2l4b.html (211 words)

	heartcoherence - VCP Unified Field Theory
		In this regard it is noteworthy that quantum physics fails to provide a wave equation of the observer, which would make philosophies on the intrinsically statistic nature of creation obsolete.
		In physics terms we could think of a (complex) soliton wave or toroidal field, emerging from the Void and kept alife by symmetry operations.
		Summarizing, in the light of vacuum coherence physics, Unified Field theory is really a physics of Life, deeply based upon the idea that Life itself is the cornerstone of all creation.
	www.heartcoherence.com /vcp-unified-field-theory (1240 words)

	Event_4
		The end result is that the Modern Physical explanation of the operation of a tornado, that homeowners desire, has not been forthcoming.
		Now that we understand how the mechanism of the tornado's whirling wall of air allows for the maintenance of a low pressure zone at its core, it is time to discuss the effect that causes the air to whirl about an axis in the first place.
		The author grants each visitor to The Universal Physics Journal the right to make one copy of Article I for his or her own personal archive as long as the author's copyright notice is permanently affixed to the archive copy.
	www.physicsnews1.com /event_4.html (5823 words)

	View NetSplore™ @2Learn.ca
		This web activity will reinforce fundamental concepts of velocity, acceleration and frictional force by using the Reaction Time Applet to explore the relationship between the initial velocity and traction of a car and the distance it takes to skid to a stop.
		The reaction time, delay distance, braking time and braking distance and deceleration rate are displayed for student verification using the standard kinematics equations for velocity and linear acceleration.
		Assessment will be based on the combined evaluation of proper behavior in the computer lab, completion of the questions in the handout (primarily) and on the participation in the discussions to demonstrate a working knowledge of kinematics.
	www.2learn.ca /search/NetSploreView.asp?SID=352 (1187 words)

	Physics (Site not responding. Last check: 2007-10-10)
		Photonuclear Reaction Yield Ratios in Tissues Used as an Index of Abnormality.
		Structures in the 12C(16O,12C(0+2)-3alpha)16O Reaction in the Ec.m.= 15 to 34 MeV.
		Spectroscopic factors measured in inclusive proton-knockout reactions on 8B and 9C at intermediate energies.
	www.open.mis.surrey.ac.uk /misweb/research/bild9219.htm (10089 words)

	Plasma Physics and Astrophysics Research Papers and Proposals
		The first time I noticed inconsistencies in the addressed theoretical concepts was when I got involved with the basic theories in ionospheric physics in order to interpret some upper atmospheric EUV emission for my Ph.D. thesis.
		I submitted the paper in 1990 to Journal of Plasma Physics and in 1992 to Journal of Geophysical Research (together with Airglow-paper discussed further down below); in both cases it was rejected after several appeals in which the original objections of the referees were clearly invalidated.
		It is the latter which will eventually limit the development of a chain reaction which could result from the re-absorption of the radiation (if the test tube does not blow up before that).
	www.plasmaphysics.org.uk /research (6598 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)

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