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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.
Mieke Buchan. Mieke Buchan (pronounced me-ka) is an Australian television and radio presenter, writer and producer, born in Brisbane (Australia). [1] She has covered major events including: The Olympics, the US Open Tennis, 5 Super Bowls, Formula One, the Red Bull Air Race World Championship and the Oscars. [1]
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.
Adam Bobrow (born February 14, 1981), [2] also known as Snakeman [3] and The Voice of Table Tennis, [4] is an American sports commentator, YouTuber, actor, and table tennis player. He operates a YouTube channel dedicated to table tennis enthusiasts and fans, providing them with content to promote the sport.
Harri Heliövaara (born 4 June 1989) is a Finnish professional tennis player. He has been ranked by the Association of Tennis Professionals (ATP) as high as world No. 4 in doubles, which he first achieved on 27 January 2025. He also attained his career-high singles ranking of world No. 194 in December 2011.
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.