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A golf ball beside a hole. A golf ball is a special ball designed to be used in the game of golf. Under the rules of golf, a golf ball has a mass no more than 1.620 oz (45.9 g), has a diameter not less than 1.680 inches (42.7 mm), and performs within specified velocity, distance, and symmetry limits.
A baseball is the ball used in the sport of baseball. It consists of a rubber or cork center wrapped in yarn and covered with white natural horsehide or cowhide, or a synthetic composite leather. A regulation baseball is 9 to 9.25 inches (229 to 235 mm) in circumference i.e. 2.86 to 2.94 inches (73 to 75 mm) in diameter, with a weight of 5 to 5 ...
4.3 cm – minimum diameter of a golf ball; 5 cm – usual diameter of a chicken egg; 5 cm – height of a hummingbird, the smallest-known bird; 5.08 cm – 2 inches, 5.5 × 5.5 × 5.5 cm – dimensions of a 3x3x3 Rubik's cube; 6.1 cm – average height of an apple; 7.3–7.5 cm – diameter of a baseball
The circumference of an ellipse can be expressed exactly in terms of the complete elliptic integral of the second kind. More precisely, C e l l i p s e = 4 a ∫ 0 π / 2 1 − e 2 sin 2 θ d θ , {\displaystyle C_{\rm {ellipse}}=4a\int _{0}^{\pi /2}{\sqrt {1-e^{2}\sin ^{2}\theta }}\ d\theta ,}
Also called a hole in one. address The act of taking a stance and placing the club-head behind the golf ball. If the ball moves once a player has addressed the ball, there is a one-stroke penalty, unless it is clear that the actions of the player did not cause the ball to move on purpose. If the player addresses the ball and places the head of the club behind it and in doing so causes the ball ...
The International Tennis Federation (ITF) defines the official diameter as 6.54–6.86 cm (2.57–2.70 inches). Balls must have masses in the range 56.0–59.4 g (1.98–2.10 ounces). A tennis ball generally has 12 pounds per square inch (80 kPa; 0.8 atm) more of a nitrogen and oxygen mixture than the sea level ambient air pressure.