Glenn Elert
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The Physics Factbook™
Edited by Glenn Elert -- Written by his students
An educational, Fair Use website
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| Bibliographic Entry | Result (w/surrounding text) | Standardized Result |
|---|---|---|
| Litell, Mifflin. Integrated Mathematics. Evanston, IL: 1995. | "Ball (tennis), Diam. 6.5 cm, 57 g, hollow interior construction and a cloth covered exterior construction" | 57 g |
| Tennis. Americana Online. | "The ball is a cloth-covered rubber sphere that is generally yellow in color, approximately 2½ inches (6.35 cm) in diameter and 2 ounces (56.69 grams) in weight" | 56.69 g |
| Sports A to Z: Tennis: Equipment. United States Olympic Committee. | "A tennis ball is hollow and composed of inflated rubber covered with a fabric. It is between 2½"and 2 5/8"(6.35 and 6.67 cm) in diameter and weighs between 2 and 2 1/16 ounces (57.7 and 58.5 grams)." | 56.7–58.5 g |
| New Encyclopedia Britannica. 15th ed. 1997. | "The ITF specifies that the ball must be between 2½ inches (6.35cm) and 2 5/8 inches in diameter and between two ounces (56.7 g) and 2 1/16 ounces in weight" | 56.7 g |
| World Book Encyclopedia. Chicago: World Book, 1998. | "It must weigh more than 2 ounces (56.7 grams) but less than 2 1/16 ounces in weight" | 56.7–58.5 g |
Tennis is an outdoor or indoor game, which is played on a rectangularcourt by two persons (known as singles) or by four persons (doubles).Rackets are used to hit the ball back and forth across a net.The object of the game is to score points by striking the ballin a way that an opponent can not successfully return it. Theorigins of the game dates back to the Stone Age, when humans firstused their clubs to hit rocks back and forth across barricadesof dirt and stone. The tennis court is 78 feet (23.8 meters) long,and its divided into equal sides by a net that stands 3 feet (0.9 meters) high at the center of the court. For singles, the courtis 27 feet (8.2 meters) wide. For doubles the width is increasedto 36 feet (11 meters). A tennis ball is hollow and composed ofinflated rubber, covered with a fabric which must be uniform.Its between 2½ and 2 5/8 inches (6.35 and 6.67 cm)in diameter and weighs between 2 and 2 1/16 ounces (57.7and 58.5 grams). Yellow and white balls are used in competition.When dropped on concrete from a height of 100 inches (2.5 meters),they must bounce upward from 53 to 56 inches (135 to 147 centimeters).The serve is the most important stroke in tennis. There are noweight restrictions on the racket and it is usually strung withresilient gut or nylon. The surface of the court may be grass,clay, or some kind of hard material which is usually concrete,asphalt, synthetic turf, or wood. The court surface is an importantelement in tennis because balls bounce higher or lower, fasteror slower, depending on the surface they strike. There is a tendencyto slide on clay while harder surfaces are ideal for quick startsand stops.
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