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Topic: Ping Pong Ball Theory

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	General relativity - Wikipedia, the free encyclopedia
		Similarly, two balls initially at rest with respect to and above the surface of the Earth (which are parallel paths by virtue of being at rest with respect to each other) come to have a converging component of relative velocity as both accelerate towards the center of the Earth due to their subsequent freefall.
		For gravitation, the relationship between Newton's theory of gravity and general relativity is governed by the correspondence principle: General relativity must produce the same results as gravity does for the cases where Newtonian physics has been shown to be accurate.
		Both these theories have turned out to be historically important for other reasons: Weyl's idea of gauge invariance survived and in fact is omnipresent in modern physics, while Kaluza's idea of compact extra dimensions has been resurrected in the modern notion of a brane-world.
	en.wikipedia.org /wiki/General_theory_of_relativity (4309 words)

	Black hole - Wikipedia, the free encyclopedia
		General relativity (as well as most other metric theories of gravity) not only says that fl holes can exist, but in fact predicts that they will be formed in nature whenever a sufficient amount of mass gets packed in a given region of space, through a process called gravitational collapse.
		Indeed the introduction of this theory in the 1970s removed a major objection to the belief that quasars were distant galaxies — namely, that no physical mechanism could generate that much energy.
		According to theory, the event horizon of a fl hole that is not spinning is spherical, and its singularity is (informally speaking) a single point.
	en.wikipedia.org /wiki/Black_hole (4549 words)

	Rebound Of Hollow Elastic Spheres
		Applying this to the ping pong ball, the duration of its bounce with a hard table should be 0.00071 s.
		Apparently, part of the rules for ping pong include a lower limit on the coefficient of restitution, based on the requirement that "a standard ping-pong ball falling down from a height of 30 cm should bounce back at least 23 cm." (link here) This corresponds to a coefficient of restitution of 0.876.
		The friction between the ball and the table as well as the dissipative characteristics of the plastic would need to be included in a realistic model of a ping pong ball bounce.
	www.geocities.com /cofrest/md3.htm (2390 words)

	USSSP - Baloo's Bugle
		As the ball is thrown from the tube, the ball rubs against the sand paper on the inside of the tube from the direction the tube is moving.
		As the ball spins, the surface friction of the ball with the surrounding air drags a thin layer of air with it.
		On one side of the ball, the boundary layer air is traveling in the same direction as the air stream that is flowing around the ball (the blue arrows).
	www.usscouts.org /bbugle/bb0311/bbw2.html (1005 words)

	Ping Pong Ball Theory - Wikipedia, the free encyclopedia
		Search for Ping Pong Ball Theory in other articles.
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	en.wikipedia.org /wiki/Ping_Pong_Ball_Theory (146 words)

	CHLADNI PLATES
		air pressure is used to accelerate a ping pong ball to a very high speed.
		In 2001 the official size of a ping pong ball increased from 38 to 40 mm.
		However, the ping pong ball is a lot less destructive than a hand gun because of its large cross section in comparison with a bullet.
	www.phys.utk.edu /demoroom/MECH/VACCANON.htm (405 words)

	PIRA 2C20.00 BERNOULLI FORCE (Site not responding. Last check: 2007-10-16)
		A ping pong ball is supported on a vertical stream of water, air or steam.
		A styrofoam ball is suspended in an air jet from a vacuum cleaner.
		A ping pong ball is supported by air or water streaming out of an upside-down funnel.
	www.physics.ncsu.edu /pira/2fluid/2C20.html (1080 words)

	Personal Construct Theory
		Personal Construct Psychology (PCP) is known as such, rather than as a “theory”, because it is the only approach in psychology which was developed from the start as a complete psychology, explicit about its asumptions and theoretical base.
		The theory is set out in his major work as a series of formal postulates and corollaries, but its essence is that personal identity is defined by the way we construe or “understand” our personal worlds.
		Personal construct theory gives one of the richest possible accounts of a person's cognitive processes, and has been developed as a tool in “conversational" models of learning.
	www.learningandteaching.info /learning/personal.htm (1008 words)

	Einstein's Special Theory of Relativity
		Suppose there is an individual standing by a train track holding a ping pong ball.
		Now if this person’s twin were to come by in a train traveling at a constant 40 km/hr and the twin dropped a ping pong ball.
		If you were playing dodgeball and attempted to run away from the ball at 40km/hr it would appear the ball is moving at only 10km/hr.
	www.physics247.com /relativity/0001.shtml (614 words)

	2WS: Theory and Practice (Site not responding. Last check: 2007-10-16)
		Theory is all powerful; theory is good; if you want a good, albeit over-hyped, discussion of how theory withstands counter-examples see Thomas Kuhn, The Structure of Scientific Revolutions.
		It takes a while to sink in and an awful lot of 1's and 2's on damage dice; eventually you get to the point where whenever you roll a 2 for longsword damage you pick up the eight-sider just to be sure.
		Finally, the theory has to go and you put the eight-sided four-siders in the big box with Chuck and all the other dice you don't use anymore.
	www.second-world-simulations.com /TheoryandPractice.htm (1618 words)

	New Theory Explains Quick Switch in Switchable Mirrors
		Zhang says standard physics theory does not explain the switching phenomenon from mirror to window, because it is a single-particle theory and does not account for the strong electron correlation in the hydrides.
		Hydrogen is the smallest atom in the world, so the hydrogen is like a ping pong ball.
		Zhang says his theory can explain the switch in both the lanthanum and yttrium-based materials, and should be useful in studying other rare earth hydrides as well.
	www.eurekalert.org /pub_releases/1997-03/UoC-NTEQ-190397.php (508 words)

	Space Science Demonstrations Hawaiian Style (Site not responding. Last check: 2007-10-16)
		Fido the trained ping pong ball hovers over a hair dryer moving to the left and right with the class and even jumps through the paper towel roll.
		The hair dryer needs to be set on high, and cool if you have that setting, while a ping pong ball is placed on the stream of air blowing up.
		Once the tube is placed over the ball and the high pressure is removed, the ball is shot upwards.
	www.spacegrant.hawaii.edu /ScienceDemos/fido.html (344 words)

	Selling The Molecular Kinetic Theory
		This is where I use the ping pong paddle and ball.
		I relate to the students that the ping pong ball and paddle are only a model of what occurs on a molecular level in matter.
		In the case of the fire syringe, (which is really a lot like a bicycle pump with no opening for air to escape), we smash a gas so quickly that the molecules bang off each other so fast that the temperature quickly rises to at least 451 degrees Fahrenheit....the kindling temperature for paper.
	www.iit.edu /%7Esmile/ch93eg.html (1101 words)

	Marilyn needs too many Ping-Pong Balls (Site not responding. Last check: 2007-10-16)
		In her Parade Magazine column of January 5, 1997, Marilyn claimed that 4900 balls would be required to build a four sided equilateral pyramid (with a square base and equilateral triangles on the four sides), despite the fact that five balls would be quite sufficient.
		In her column of March 2, 1997, Marilyn attempted to justify her original answer by claiming that the balls had to be arranged in a square before building the pyramid.
		A reader asked her to state the smallest number of ping pong balls needed to build a pyramid by adding successive layers to a square base.
	www.wiskit.com /marilyn.balls.html (683 words)

	ESPN.com: NBA - NBA won't broadcast lottery's Ping-Pong draw
		After giving strong consideration to televising the Ping Pong-ball portion of the draft lottery for the first time, the NBA has elected to put off alterations to its lottery format for at least another season.
		Four news organizations were in conference room 3A at the NBA Entertainment building in Secaucus, N.J., last May to see the Houston Rockets overcome the league's sixth-worst record to win the lottery...
		In the Ping-Pong ball portion of the lottery, 1,001 combinations are divided among the 13 lottery participants.
	espn.go.com /nba/columns/stein_marc/1530348.html (488 words)

	Wired News: Probe Set to Test Einstein Theory
		The probe, said to be one of the most precise scientific instruments ever assembled, was initially scheduled to begin taking measurements within 45 to 60 days of its April 20 launch into Earth orbit.
		And a combination of an advanced microthruster design and a speedy software upgrade allowed the remaining 14 thrusters to compensate for the two that were taken offline.
		Though many of the theory's underlying concepts have been tested and proven in the 89 years since Einstein first published them, the proof for two concepts has remained elusive.
	www.wired.com /news/space/0,2697,64505,00.html?tw=wn_tophead_1 (978 words)

	Reviews (Site not responding. Last check: 2007-10-16)
		He picks up the kerchief and presents it again to the audience for examination: The ping-pong ball is nowhere to be found.
		It is a fictional account of what one of the greatest scientific minds dreams as he begins to uncover his theory of relativity.
		Even if you think none of these theories are feasible, you will agree with this fact: In our existence, time is limited.
	home.comcast.net /~bcmckinne/dela24.html (640 words)

	index
		The probability of drawing 2 fl balls is 0.25, while there are 2 possible ways of drawing out 2 balls of opposite color so the total probability of drawing a white and a fl ball in any order is 0.25 + 0.25 = 0.5.
		An advantage of the ping-pong ball experiment is that we can draw out balls either sequentially, in which case the ordering is important, or we can draw them out simultaneously, in which case the ordering is irrelevant and we can add probabilities.
		For convenience the white balls are represented by 'zeros' and the fl balls are represented by 'ones' so that the combinations appear as binary numbers.
	www.ipp.mpg.de /~taggart/ping_pong.html (2187 words)

	(version 7/18/01) (Site not responding. Last check: 2007-10-16)
		(For example, a ping-pong ball and a steel ball bearing of the same size.) In this lab care has been taken to make these choices so that ignoring air resistance will have a very small effect on the trajectory of the projectile.
		Using the values of the initial speed of the ball as determined in Exercise 1, calculate the horizontal distance from the launch point where the ball should land at the short, medium, and long range settings.
		Summarize all your results and show the appropriate errors for the various comparisons between theory and experiment.
	www.physics.wsu.edu /academics/labs/201Labs/Projectile(5-29-03).htm (1070 words)

	Bouncing Balls (Site not responding. Last check: 2007-10-16)
		Theory: Visit this website and read about an activity on Bouncing Balls.
		Attach the meter stick to the stand such that the 0 cm mark is at the surface.
		Drop the bouncy ball from 100 cm, and measure the bounced height.
	bohr.winthrop.edu /faculty/mahes/link_to_webpages/courses/scie201d/bouncing_balls.html (155 words)

	Part 1 of 2 - Aero Stuff
		Since a cylinder is symmetric front-to-back (and top-to-bottom), their early theories predicted it should have no drag (or lift).
		The dimples on a golf ball are designed to promote turbulence and thus reduce drag on the ball in flight.
		If a golf ball were smooth like a ping pong ball, it would have much more drag.
	realbig.com /detomaso/1997-06/337.html (2963 words)

	Pravda.RU NASA testing Einstein theory
		To ensure accuracy, the balls must be kept chilled to near absolute zero, inside the largest vacuum flask ever flown in space, and isolated from any disturbances in the quietest environment ever produced, said Anne Kinney, director Nasa's division of astronomy and physics.
		But in Einstein's widely accepted theory, space-time is a structure that's not only warped by such cosmic activity but also helps direct the movement of those bodies.
		The gyroscopes' four spherical rotors, each the size of a ping-pong ball, are considered the roundest manmade objects in the world.
	newsfromrussia.com /science/2004/04/03/53195.html (1771 words)

	PERSON-WORLD THEORY
		Even though the EL worshipped the scientists as angels, and accepted that their theories were incomprehensibly abstruse, the EL assumed, all the same, that those theories substantiated the EL’s casual notions about reality.
		On this basis, personhood theory refrains from pre-empting the inquiry by invoking an external factual world which the present culture is supposed to know with unique assurance.
		Personhood theory doesn’t avoid that consideration; it returns to it again and again—especially in connection with romantic affection, wherein the other arrives like a miracle.
	www.henryflynt.org /person_world/per-world95filei.html (7592 words)

	NEWS: Ping Pong Fitness (Site not responding. Last check: 2007-10-16)
		After one of Brett's recent errant forehand smashes, I sprinted to the ball, wanting to grab it before it rolled beneath the car.
		Bob Foley, a former NCAA Division II baseball and football player and now a 42-year-old physical therapist's assistant, purchased a ball machine that feeds him underspin, topspin, no spin, enabling him to imitate Forrest Gump and play 24/7.
		But his finals loss is being appealed to the Court of Arbitration for Sport because the insurance claims adjuster who beat him was warned about hiding the ball by illegally cupping it in his palm when serving.
	www.sdtta.org /news_ping_pong_fitness.html (762 words)

	Science Netlinks: Science Updates
		Well, as it turns out, it's not so much that a ping-pong ball is like a single snowflake, but rather that a whole bunch of ping-pong balls sliding down a slope behave like a big pile of snow.
		If you did the same experiment with bowling balls, the avalanche would be quite different (although you wouldn't want to be at the bottom of it): the bowling balls would roll pretty close to the surface of the slope.
		First of all, ping-pong balls are a lot easier to work with: you know exactly how many you started with, how much they weigh, and so on.
	www.sciencenetlinks.com /sci_update.cfm?DocID=205 (788 words)

	Fuzz and Ping Pong Unmasked
		Afterwards Ping Pong and I stayed up until 4 am, acting like we were twelve years old.
		Ping Pong is maniacally sewing fabric squares for Costume Tech class(as well as spending ample time with Kevin-I-mean-Keith-I-mean-Craaaayg), so I don't think you'll be hearing from her for a time.
		Ping Pong and I watched "The Silence of the Lambs" last night.
	thistledoon.blogspot.com (8757 words)

	village voice > news > Ping-Pong Madness by Susan Brownmiller
		Behold the swoop and reach as the bright orange ball is thwacked across the net.
		Abiy Eshetu, an Ethiopian player, clued me in to something he'd thought was too obvious to mention: all balls are not created equal, and the best ones aren't necessarily white.
		Three-star Nittaku attack balls, made in Japan and usually orange, are more durable, more perfectly spherical, and more reliable in action.
	www.villagevoice.com /news/9938,brownmiller,8476,3.html (1671 words)

	Will gravity theory hold up in space? \| csmonitor.com
		At first blush, past experiments confirming Einstein's theory of general relativity would appear to have rendered it a done deal, says Stanford University physicist Francis Everitt, lead investigator for Gravity Probe B. Yet "we don't know it all," he says.
		At the heart of each gyro is a spinning fused-quartz sphere the size of a Ping-Pong ball.
		Covered with a thin layer of niobium, the sphere is so smooth that if it were the size of Earth, the highest and lowest points would vary by no more than eight feet from the surface.
	www.csmonitor.com /2004/0408/p17s01-stss.htm (701 words)

	Atomic Theory: Introducing the shape, relative size and physical positioning of orbitals (Site not responding. Last check: 2007-10-16)
		Atomic Theory: Introducing the shape, relative size and physical positioning of orbitals.
		To represent the 1s orbital use a small ping pong ball, for a 2s orbital a softball, and a 3s a volleyball.
		To show how the s and p orbitals fit together, start with one 2p orbital place the softball (2s) at the node in the 2p, and then the ping pong ball (1s) hold in front of the softball, indicating that it would actually be inside the softball (2s).
	educ.queensu.ca /~science/main/concept/chem/c07/c07tpk17.html (260 words)

	A New Theory of Magnetism
		The theory has to predict the same inertial resistance to acceleration regardless of the angle of the acceleration to the direction of motion of the charge.
		The simplest theory by which I can account for the existence of magnetic fields is to assume that they are generated by the relative movement of electric fields through one another.
		In formulating a theory of magnetism in terms of the individual charges from which matter is built, we have up till now found no place for the conventional definitions of magnetic induction and permeability as they are applied to magnetic materials.
	users.powernet.co.uk /bearsoft/P3Mag.html (5867 words)

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