A ball is a round, usually spherical but sometimes ovoid, object with various uses. It is used in ball games, where the play of the game follows the state of the ball as it is hit, kicked or thrown by players. Balls can also be used for simpler activities, such as catch, marbles and juggling. Balls made from hard-wearing materials are used in engineering applications to provide very low friction bearings, known as ball bearings. Black powder weapons use stone and metal balls as projectiles.
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Some articles on ball:
... decomposition of the solid unit ball minus the point at the ball's centre (this center point needs a bit more care, see below) ... are only countably many such points, and like the point at the centre of the ball, it is possible to patch the proof to account for them all (see below) ...
... Computed tomography of a football (soccer) (Video) Baoding balls Baseball Basketball Billiard balls Bowling ball (and pin) Lacrosse ball Cricket ...
... is a theorem in set-theoretic geometry which states the following Given a solid ball in 3‑dimensional space, there exists a decomposition of the ball ... way to yield two identical copies of the original ball ... solid objects (such as a small ball and a huge ball), either one can be reassembled into the other ...
... is the tiny seam which runs around a cricket ball at 90 degrees to the large, raised seam ... can be 'picked at' - loosening the threads - in order to create conventional swing when the ball is relatively new, more recently, an understanding has evolved that the ... an over alters the balance of air pressure surrounding the ball as it travels through the air and help it reverse ...
... it is possible to obtain k copies of a ball in the Euclidean n-space from one, for any integers n ≥ 3 and k ≥ 1, i.e ... a ball can be cut into k pieces so that each of them is equidecomposable to a ball of the same size as the original ... These results then extend to the unit ball deprived of the origin ...
More definitions of "ball":
- (noun): Round object that is hit or thrown or kicked in games.
Example: "The ball travelled 90 mph on his serve"; "the mayor threw out the first ball"; "the ball rolled into the corner pocket"
- (noun): A pitch that is not in the strike zone.
Example: "He threw nine straight balls before the manager yanked him"
- (noun): A lavish formal dance.
- (noun): One of the two male reproductive glands that produce spermatozoa and secrete androgens.
Synonyms: testis, testicle, orchis, ballock, bollock, nut, egg
- (noun): United States comedienne best known as the star of a popular television program (1911-1989).
Synonyms: Lucille Ball
- (noun): A compact mass.
Example: "A ball of mud caught him on the shoulder"
Synonyms: clod, glob, lump, clump, chunk
- (noun): A more or less rounded anatomical body or mass; ball of the human foot or ball at the base of the thumb.
Example: "He stood on the balls of his feet"
- (verb): Form into a ball by winding or rolling.
Example: "Ball wool"
- (noun): The people assembled at a lavish formal dance.
Example: "The ball was already emptying out before the fire alarm sounded"
- (noun): A spherical object used as a plaything.
Example: "He played with his rubber ball in the bathtub"
Famous quotes containing the word ball:
“The symbolic view of things is a consequence of long absorption in images. Is sign language the real language of Paradise?”
—Hugo Ball (18861927)
“Life ... is not simply a series of exciting new ventures. The future is not always a whole new ball game. There tends to be unfinished business. One trails all sorts of things around with one, things that simply wont be got rid of.”
—Anita Brookner (b. 1928)
“We should burn all libraries and allow to remain only that which everyone knows by heart. A beautiful age of the legend would then begin.”
—Hugo Ball (18861927)