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2. Racket (sports equipment) - Wikipedia

   en.wikipedia.org/wiki/Racket_(sports_equipment)

   Racquetball racket and ball. A racket or racquet[ 1] is an item of sporting equipment used to strike a ball or shuttlecock back-and-forth in games such as tennis, badminton, squash, racquetball and padel. The typical basic structure of a racket consists of a widened distal end known as the head (which presents a flattened firm surface designed ...

3. List of tennis code violations - Wikipedia

   en.wikipedia.org/wiki/List_of_tennis_code_violations

   Roger Federer. Tennys Sandgren. Fined $3,000 for audible obscenity in the quarter-final match at the Australian Open against Tennys Sandgren. Federer received a code violation when a line judge reported him to the umpire, Marijana Veljovic. [ 65] 2020 Australian Open, Australia. Novak Djokovic. Dominic Thiem.

4. Wilson Sporting Goods - Wikipedia

   en.wikipedia.org/wiki/Wilson_Sporting_Goods

   Roger Federer used Wilson racquets in the 2009 Wimbledon Championship. Wilson is a major manufacturer of tennis rackets. The original kevlar Pro Staff model racket, known for its use by Pete Sampras, was heavy (more than 350g strung) and small-headed (85 sq. in.); Roger Federer also used the same racket model. In 2015, he used the Pro Staff ...

5. Tennis racket theorem - Wikipedia

   en.wikipedia.org/wiki/Tennis_racket_theorem

   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 dubbed the Dzhanibekov effect , after Soviet cosmonaut Vladimir Dzhanibekov , who noticed one of the theorem's logical consequences ...

6. Speech error - Wikipedia

   en.wikipedia.org/wiki/Speech_error

   A speech error, commonly referred to as a slip of the tongue[ 1] ( Latin: lapsus linguae, or occasionally self-demonstratingly, lipsus languae) or misspeaking, is a deviation (conscious or unconscious) from the apparently intended form of an utterance. [ 2] They can be subdivided into spontaneously and inadvertently produced speech errors and ...

7. List of sports - Wikipedia

   en.wikipedia.org/wiki/List_of_sports

   5.4.2 Sports that use a non-netted racket, or paddle. 6 Board ... Tennis ball cricket; ... Sports where the main objective is to hit a certain target. Archery; Axe ...