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	Torsion bar experiment - Wikipedia, the free encyclopedia
		In physics, the purpose of the torsion bar experiment is to estimate the gravitational constant.
		The torsion bar experiment was originally proposed by John Michell, who constructed a torsion bar apparatus, but Michell died without completing the experiment.
		A description of Cavendish's experiment and a summary of several similar experiments are given by the 1911 Encyclopaedia Britannica.
	en.wikipedia.org /wiki/Torsion_bar_experiment (323 words)

	Torsion bar experiment -- Facts, Info, and Encyclopedia article (Site not responding. Last check: 2007-10-08)
		the purpose of the torsion bar experiment is to estimate the ((physics) the universal constant relating force to mass and distance in Newton's law of gravitation) gravitational constant.
		Two 350-pound lead spheres placed nearby exerted just enough ((physics) the force of attraction between all masses in the universe; especially the attraction of the earth's mass for bodies near its surface) gravitational force to tug at the end-weights, causing the wire to twist.
		A description of Cavendish's experiment and a summary of several similar experiments are given by the 1911 Encyclopedia Britannica.
	www.absoluteastronomy.com /encyclopedia/t/to/torsion_bar_experiment.htm (359 words)

	The most beautiful experiment (September 2002) - Physics World - PhysicsWeb
		The double-slit experiment with electrons possesses all of the aspects of beauty most frequently mentioned by readers - although, unlike all of the other experiments in the top 10, it does not have anyone's name attached to it.
		And it hardly needs saying that the various experiments demonstrating quantum-mechanical principles were not born simply, and have not made the world simpler.
		Demonstrations and simulations can misrepresent by encouraging the sense that a scientific experiment is just an illustration of an already formulated lesson - turning the experiment into a paint-by-numbers masterpiece, as it were - rather than a process by which a hitherto unknown truth becomes disclosed for the first time.
	physicsweb.org /article/world/15/9/2 (2158 words)

	Torsion bar experiment (Site not responding. Last check: 2007-10-08)
		the purpose of the torsion bar experiment is to estimate the gravitational constant.
		The torsion bar experiment was originally proposed by John Michell,
		Cavendish set up the apparatus in a wind-proof room and measured the twist (torsion) of the wire using a telescope.
	www.infothis.com /find/Torsion_bar_experiment (257 words)

	Science's 10 Most Beautiful Experiments
		The experiment was performed in 1797–98 by the English scientist Henry Cavendish.
		Attraction between pairs of weights caused the wire to twist slightly, which thus allowed the first calculation of the value of the gravitational constant G. The experiment was popularly known as weighing the Earth because determination of G permitted calculation of the Earth's mass.
		The exact length of the units (stadia) he used is doubtful, and the accuracy of his result is therefore uncertain; it may have varied by 0.5 to 17 percent from the value accepted by modern astronomers.
	physics.nad.ru /Physics/English/top_ref.htm#grav (1545 words)

	Timeline of scientific experiments - Wikipedia, the free encyclopedia
		See also timeline of scientific discoveries, timeline of technological discoveries, list of timelines of science and technology, list of famous experiments.
		1798 - Henry Cavendish: Torsion bar experiment to measure the gravitational constant
		1955 - Clyde L. Cowan and Frederick Reines confirm the existence of the neutrino in the neutrino experiment
	en.wikipedia.org /wiki/Timeline_of_scientific_experiments (557 words)

	Gravity - Wikipedia, the free encyclopedia
		Crucial experiments that justified the adoption of General Relativity over Newtonian gravity were the classical tests: the gravitational redshift, the deflection of light rays by the Sun, and the precession of the orbit of Mercury.
		In 2002, the Fomalont-Kopeikin experiment produced measurements of the speed of gravity which matched this prediction.
		However, this experiment has not yet been widely peer-reviewed, and is facing criticism from those who claim that Fomalont-Kopeikin did nothing more than measure the speed of light in a convoluted manner.
	en.wikipedia.org /wiki/Gravity (4447 words)

	PIRA 1L10.00 UNIV. GRAVITATIONAL CONSTANT (Site not responding. Last check: 2007-10-08)
		Quite a bit of discussion about the Klinger KM 1115 gravitational torsion balance.
		Standard Cavendish experiment with lead balls and optical lever detection.
		Mount the Cavendish balance permanently in the classroom and adjust hours before the experiment.
	www.physics.ncsu.edu /pira/1mech/1L10.html (250 words)

	Gravitational constant (Site not responding. Last check: 2007-10-08)
		He used a horizontal torsion beam with lead balls whose inertia (in relation to the torsion constant) he could tell by timing the beam's oscillation.
		Their faint attraction to other balls placed alongside the beam was detectable by the deflection it caused.
		G is quite difficult to measure, as gravity is much weaker than other fundamental forces, and an experimental apparatus cannot be separated from the gravitational influence of other bodies.
	www.bidprobe.com /en/wikipedia/g/gr/gravitational_constant.html (532 words)

	Science.news (Site not responding. Last check: 2007-10-08)
		hether they are blasting apart subatomic particles in accelerators, sequencing the genome or analyzing the wobble of a distant star, the experiments that grab the world's attention often cost millions of dollars to execute and produce torrents of data to be processed over months by supercomputers.
		To guard against the influence of air currents, the apparatus (called a torsion balance) was enclosed in a room and observed with telescopes mounted on each side.
		The result was a remarkably accurate estimate of a parameter called the gravitational constant, and from that Cavendish was able to calculate the density and mass of the earth.
	w3fp.arizona.edu /khirschboeck/nats101gc/science_news.htm (4797 words)

	Gravity
		Gravity is small unless at least one of the two bodies is large or one body is very dense and the other is close by, but the small gravitational force exerted by bodies of ordinary size can fairly easily be detected through experiments such as the Cavendish torsion bar experiment.
		Since Einstein discovered his theory of gravitation the gravity is not one of the fundamental forces of nature so it is a small wonder that it has not been fitted into the formalism of quantum mechanics (the three fundamental forces: Electromagnetism, the Strong Force, and the Weak Force, can be).
		Also, land-based experiments like LIGO are gearing up to possibly detect gravitational waves directly.
	encyclopedia.codeboy.net /wikipedia/g/gr/gravity.html (3581 words)

	Objective Subjectivity
		Hershey-Chase experiment uses bacteriophage to prove that DNA is the hereditary material (1952)
		Michelson-Morley experiment exposes weaknesses of the prevailing variant of the theory of luminiferous aether.
		Ernest Rutherford's gold foil experiment demonstrated that the positive charge and mass of an atom is concentrated in a small, central atomic nucleus, disproving the then-popular plum pudding model of the atom.
	emphatico.blogspot.com (3648 words)

	Science In Action: Gravity -- Just Another Theory?
		The most fascinating thing about gravitation is that, while we all experience it, and engineers can estimate its force accurately enough to build bridges that don't fall down and send rockets to Saturn, we just don't know how it works.
		This was done quantitatively in the Cavendish torsion bar experiment (first carried out in about 1798, while John Adams was the second president of the United States and Napoleon was invading Egypt.) You can perform this experiment yourself, if you have some time on your hands and a suitably quiet space.
		On the other hand, the theory of evolution by natural selection is much better supported by experiment and observation, explains much about life, and continues to impress scientists with its ability to generate, employ and explain new and amazing information, for example from molecular biology.
	sxxz.blogspot.com /2005/08/gravity-just-another-theory.html (631 words)

	[No title] (Site not responding. Last check: 2007-10-08)
		The periodic table of elements shows all the known elements where elements are arranged from left to right and top to bottom increasing according to their atomic number or mass.
		An Interactive exercise where the user conducts experiments in weight, mass, volume, density and gravity.
		Water pressure and sea pressure, like air pressure, is a function of weight; the deeper one goes the greater the surrounding sea pressure.
	www.eoascientific.com /campus/science/multimedia (248 words)

	Singular Values: September 2002
		Bob reports that a small area of the brain appears to be responsible for near-death and out-of-body experiences, according to research published in Nature.
		A tiny part of the brain behind the right ear can cause out-of-body experiences and could explain the many stories of near-death patients who say they have looked down at their own bodies, a team of Swiss scientists announced yesterday.
		While treating a woman with epilepsy, the researchers discovered that every time they applied a mild electrical current to part of the woman's brain she felt as if she were floating near the ceiling, looking down on her own body like a soul freed of its earthly bonds.
	schlafly.blogspot.com /2002_09_01_schlafly_archive.html (10914 words)

	both2and: beyond binary
		Most of the experiments ~ which are listed in this month's Physics World ~ took place on tabletops and none required more computational power than that of a slide rule or calculator.
		I have to admit that I was less than familiar with 2 of these.
		Discussing child-rearing, he says that children's characters are shaped by their genes, by their peer group and by chance experiences; parents cannot mold their children's nature, nor should they wish to, any more than they can redesign that of their spouses.
	radio.weblogs.com /0100595/2002/09/24.html (747 words)

	Mail 224 September 23 - 29. 2002
		The ‘essence’ of the European Union, writes Everts, is ‘all about subjecting inter-state relations to the rule of law,’ and Europe's experience of successful multilateral governance has in turn produced an ambition to convert the world.
		Whether they are blasting apart subatomic particles in accelerators, sequencing the genome or analyzing the wobble of a distant star, the experiments that grab the world's attention often cost millions of dollars to execute and produce torrents of data to be processed over months by supercomputers.
		In the Seventy Years War our defense required overseas experiments: Stalinism really did require something like world hegemony to be stable; the Stalinists knew that (as did the Trotskyites), and containment in The Protracted Conflict was a defense of liberty.
	www.jerrypournelle.com /archives2/archives2mail/mail224.html (10855 words)

	Chapter 5 (Site not responding. Last check: 2007-10-08)
		However, Newton's study of optics, brilliant though it was, could not successfully maintain an atomistic view of light.
		To Rutherford's surprise, his experiment demonstrated the existence of a very small, positively charged nucleus with a charge equal to the atomic number of the element times the charge of the electron.
		Newton had shown the principle to be valid to one part in a thousand, but subsequent experiments, notably that of Eötvös,
	www.bdoghouse.com /Thesis/Chapter6.html (11455 words)

	sciforums.com - Science's 10 Most Beautiful Experiments (Site not responding. Last check: 2007-10-08)
		Young's double-slit experiment applied to the interface of single electrons.
		Using holes to measure when sunlight hit the bottom and different locations as far as he could reasonably go at the time.
		I would have to say that my favorite experiment is the Stern-Gerlach experiment.
	www.sciforums.com /showthread.php?t=11380 (334 words)

	filchyboy \| a journal of madness & survival
		I would spend an inordinate amount of time watching the earth rotate back in middle school.
		My assignment, should I choose to accept it, is to ensure that I teach K about all of these experiments.
		Young's double-slit experiment applied to the interference of single electrons
	blogs.salon.com /0001021/2002/09/29.html (86 words)

	CMRA Ruqiang Feng (Site not responding. Last check: 2007-10-08)
		Areas of interest include inelastic deformation, damage and failure mechanisms of solids, high strain rate and shock wave phenomena, rheology of polymers and polymer compounds, surface mechanics and tribology (friction and wear), polycrystal modeling and simulations, and hybrid atomistic-continuum modeling and simulations of defects/heterogeneities in materials and material systems.
		Hu, Y and Feng, R., “On the Use of Kolsky Torsion Bar to Study the Transient Large-Strain Response of Polymer Melts at High Shear Rates,” Journal of Applied Mechanics.
		Huang, H. and Feng, R., “A Study of the Dynamic Tribological Response of Closed Fracture Surface Pairs by Kolsky-Bar Compression-Shear Experiment,” International Journal of Solids and Structures 41, 2821-2835 (2004).
	www.unl.edu /cmra/faculty/feng.html (414 words)

	24 Sep History: This Date
		The study does not resolve the question of which species is superior, or even whether such a question is meaningful.
		2002 The top ten “most beautiful” experiments in physics voted by over 200 responding readers and listed in the September 2002 issue of Physics World [link is to current issue] are: 1.
		Young's double-slit experiment applied to the interference of single electrons — 2.
	www.safran-arts.com /42day/history/h4sep/h4sep24.html (10123 words)

	The most beautiful experiment in physics :: hebig.org/blog
		Though named Young's experiment, it wasn't until 1961, the same year Feynman started his lectures, that someone carried out the winning experiment in real world - Claus Jönsson of Tübingen.
		"By that time no one was really surprised by the outcome, and the report, like most, was absorbed anonymously into science" - now, it gets revisited, and the Physics World editorial has more on the history of this experiment.
		The New York Times goes ahead and delivers enlightenment to the masses: background and details on the ten experiments in plain English, "a bird's-eye view of more than 2,000 years of discovery" (free login required)
	www.hebig.org /blogs/archives/main/000386.php (405 words)

	Site Contents at the free Online Encyclopedia. (Site not responding. Last check: 2007-10-08)
		You are here: Online Encyclopedia > Site Map pg 7 > Torsion bar experime...
		Enter a phrase or search word in the box below.
		In a household, clothes hangers are the single one item that you own the most of, yet no one can name even one brand?
	www.onlineencyclopedia.org /index_324.html (107 words)

	UMKC SPS: News
		We experimented with this, using 2 pink erasers and 1 white eraser.
		Copies of a NY Times article on science's 10 most beautiful experiments were passed out.
		{They are: (1)Eratosthenes' measurement of the Earth's circumference, (2)Galileo's experiment on falling objects, (3)his experiments with rolling balls down inclined planes, (4)Newton's decomposition of sunlight with a prism, (5)Cavendish's torsion-bar experiment, (6)Young's light-interference experiment, (7)Foucault's pendulum, (8)Millikan's oil-drop experiment, (9)Rutherford's discovery of the nucleus, (10)Young's double-slit experiment with single electrons}
	cas.umkc.edu /physics/sps/oldnews.html (2521 words)

	KidMagnet.com - The Ultimate Portal for Today's Kids
		Includes the history of gravity, orbits, air resistance, laws, escape velocity, and fl holes.
		Cavendish Gravity Mass Experiment - Use this interactive on Cavendish Torsion Bar experiment to demonstrate how mass affects gravity.
		Neither fire nor wind, birth nor death can erase our good deeds.
	www.kidmagnet.com /School_Time_Science_Physics_Gravity.html (1798 words)

	[No title] (Site not responding. Last check: 2007-10-08)
		And in the years following passage of the law, welfare recipiency has declined significantly—without a corresponding increase in the poverty rate.
		Many observers now cite welfare reform as one of the most successful policy experiments in a generation.
		No wonder the Germans are against fighting in Iraq.
	commonsensewonder.com /mtarchives/week_2002_09_22.shtml (7851 words)

	OpinionJournal - Best of the Web Today
		If this is accurate, the cadaverous condor chick would be the first bird of any kind ever to be born anywhere.
		From today's New York Times (sixth correction): "An article in Science Times on Sept. 24 about physicists' selections of the 10 most beautiful experiments misstated a portion of Newton's theory of gravity, cited in a discussion of Cavendish's torsion-bar experiment.
		Newton held that the strength of attraction between two objects increases with the product of their masses, not with the square of their masses."
	www.opinionjournal.com /best?id=110002394 (2667 words)

	Kids.net.au - site profile for Cavendish Gravity Mass Experiment (Site not responding. Last check: 2007-10-08)
		Kids.net.au - site profile for Cavendish Gravity Mass Experiment
		Use this interactive on Cavendish Torsion Bar experiment to demonstrate how mass affects gravity.
		Kids.net.au - Search engine for kids, children, educators and teachers - Searching sites designed for kids that are child safe and clean.
	www.kids.net.au /profile.php?id=17565 (55 words)

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