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The tennis racket theorem or intermediate axis theorem, is a kinetic phenomenon of classical mechanics which describes the movement of a rigid body with three distinct principal moments of inertia. It has also been dubbed the Dzhanibekov effect , after Soviet cosmonaut Vladimir Dzhanibekov , who noticed one of the theorem's logical consequences ...
"Can a ball be decomposed into a finite number of point sets and reassembled into two balls identical to the original?" The Banach–Tarski paradox is a theorem in set-theoretic geometry, which states the following: Given a solid ball in three-dimensional space, there exists a decomposition of the ball into a finite number of disjoint subsets, which can then be put back together in a different ...
A serve (or, more formally, a service) in tennis is a shot to begin the point. The most common serve is used is an overhead serve.It is initiated by tossing the ball into the air over the server's head and hitting it when the arm is fully stretched out (usually near the apex of its trajectory) into the diagonally opposite service box without touching the net.
I-formation is a doubles tennis strategy carefully planned to confuse the opponent returning the serve. "The name comes from its resemblance to American football's I formation, in which the fullback positions right behind the halfback, who positions right behind the quarterback."
Mel Purcell (born July 18, 1959) is a former professional tennis player and coach from the U.S. His career-high singles ranking was world No. 21, achieved in November 1980. [1] Purcell's finest moment was when he reached the quarterfinals of Wimbledon in 1983. He was head coach of the Murray State University men's tennis team from 1996 to 2016.
An electronic line judge is a device used in tennis to automatically detect where a ball has landed on the court. Attempts to revolutionize tennis officiating and the judging of calls in the sport began in the early 1970s and has resulted in the design, development and prototyping of several computerized, electronic line-judge devices.
Grunting in tennis is a loud noise made by some players while hitting their shots. [1] Such noises have sometimes been described as "shrieking" [2] [3] or "screaming". [4]Monica Seles, Jimmy Connors and John McEnroe are generally considered to be the "grunt creators" in the women's and men's games, respectively.
Touchtennis is a modified version of tennis played on a compact court with foam balls and shorter (21-inch or 53-centimetre) rackets. It is regularly featured on Sky Sports and is growing in popularity and acceptance as an alternative form of the full size game.