Cricket pitch

In the game of cricket, the cricket pitch consists of the central strip of the cricket field between the wickets — 1 chain or 20.12 m (22 yards) long and 3.05 m (10 feet) wide. The surface is flat and normally covered with extremely short grass though this grass is soon removed by wear at the ends of the pitch.

In amateur matches in some parts of the world, artificial pitches are sometimes used. These can be a slab of concrete, overlaid with a coir mat, artificial turf, sometimes dirt is put over the coir mat to provide an authentic feeling pitch. Artificial pitches are rare in professional cricket, being used only when exhibition matches are played in regions where cricket is not a common sport.

The pitch has specific markings delineating the creases, as specified by the Laws of Cricket.

The word wicket often occurs in reference to the pitch. Although technically incorrect according to the Laws of Cricket (Law 7 covers the pitch and Law 8 the wickets, distinguishing between them), cricket players, followers, and commentators persist in the usage, with context eliminating any possible ambiguity. Track is yet another synonym for pitch.

Cricket

Cricket is a bat-and-ball game played between two teams of 11 players each on a field at the centre of which is a rectangular 22-yard-long pitch. The game is played by 120 million players in many countries, making it the world's second most popular sport. Each team takes its turn to bat, attempting to score runs, while the other team fields. Each turn is known as an innings (used for both singular and plural).

The bowler delivers the ball to the batsman who attempts to hit the ball with his bat away from the fielders so he can run to the other end of the pitch and score a run. Each batsman continues batting until he is out. The batting team continues batting until ten batsmen are out, or a specified number of overs of six balls have been bowled, at which point the teams switch roles and the fielding team comes in to bat.

In professional cricket, the length of a game ranges from 20 overs (T20) per side to Test cricket played over five days. The Laws of Cricket are maintained by the International Cricket Council (ICC) and the Marylebone Cricket Club (MCC) with additional Standard Playing Conditions for Test matches and One Day Internationals.

Cricket (magazine)

Cricket is an illustrated literary magazine for children published in the United States, founded in September 1973 by Marianne Carus whose intent was to create "The New Yorker for children."

Description

Each issue of Cricket is 48 pages. The magazine is published nine times a year (monthly, with some of the summer months combined) by the Carus Publishing Company of Peru, Illinois. Its target audience is children from 9 to 14 years old. Until March 1995, Cricket was published by the Open Court Publishing Company of La Salle, Illinois, now part of Carus.

Cricket publishes original stories, poems, folk tales, articles and illustrations by such notable artists as Trina Schart Hyman, the magazine's art director from 1973 to 1979. Carus has solicited materials from well-known authors and illustrators, including Lloyd Alexander, Isaac Bashevis Singer, Hilary Knight, William Saroyan, Ursula K. Le Guin, Eric Carle, Stacy Curtis, Wallace Tripp, Charles Ghigna and Paul O. Zelinsky. Cricket also runs contests and publishes work by its readers. Hyman contributed to the magazine until her death in 2004.

Colomban Cri-cri

The Colomban Cri-Cri (English: the chirp-chirp sound made by a cricket) is the smallest twin-engined manned aircraft in the world, designed in the early 1970s by French aeronautical engineer Michel Colomban.

Design and development

The Cri-Cri features a cantilever low-wing, a single-seat enclosed cockpit under a bubble canopy, fixed tricycle landing gear and twin engines mounted on pylons to the nose of the aircraft in tractor configuration. The aircraft is made from aluminum sheet glued to Klegecell foam. Its 4.9 m (16.1 ft) span wing employs a Wortmann 21.7% mod airfoil, and has an area of 3.1 m² (33 sq ft). The aircraft is also capable of aerobatics within the limitations of twin-engined aircraft.

Variants

Operational use

As with any homebuilt aircraft, the existing Cri-Cri planes have often been modified by their builders, departing from the original design to a varying degree, resulting in varying performance. Most versions can climb with one engine inoperative.

In June 2010, EADS partnered with Aero Composites Saintonge and the Greencri-cri Association to present an electric-powered Cri-Cri at the Green Aviation Show in Le Bourget. The modified airframe with composite components can fly for 30 minutes at 110 km/h. The aircraft uses four brushless electric motors with counter-rotating propellers, which makes the aircraft one of the world's smallest four-engine aircraft.

Pitch (baseball)

In baseball, a pitch is the act of throwing a baseball toward home plate to start a play. The term comes from the Knickerbocker Rules. Originally, the ball had to be literally "pitched" underhand, as with pitching horseshoes. Overhand throwing was not allowed until 1884.

The biomechanics of pitching have been studied extensively. The phases of throwing include windup, early cocking, late cocking, early acceleration, late acceleration, deceleration, and follow-through.

Pitchers throw a variety of pitches, each of which has a slightly different velocity, trajectory, movement, hand position, wrist position and/or arm angle. These variations are introduced to confuse the batter in various ways, and ultimately aid the defensive team in getting the batter or baserunners out. To obtain variety, and therefore enhance defensive baseball strategy, the pitcher manipulates the grip on the ball at the point of release. Variations in the grip cause the seams to "catch" the air differently, thereby changing the trajectory of the ball, making it harder for the batter to hit.

Flight dynamics

Flight dynamics is the study of the performance, stability, and control of vehicles flying through the air or in outer space. It is concerned with how forces acting on the vehicle influence its speed and attitude with respect to time.

In fixed-wing aircraft, the changing orientation of the vehicle with respect to the local air flow is represented by two critical parameters, angle of attack ("alpha") and angle of sideslip ("beta"). These angles describe the vector direction of airspeed, important because it is the principal source of modulations in the aerodynamic forces and moments applied to the aircraft.

Spacecraft flight dynamics involve three forces: propulsive (rocket engine), gravitational, and lift and drag (when traveling through the earths or any other celestial atmosphere). Because aerodynamic forces involved with spacecraft flight are very small, this leaves gravity as the dominant force.

Aircraft and spacecraft share a critical interest in their orientation with respect to the earth horizon and heading, and this is represented by another set of angles, "yaw," "pitch" and "roll" which angles match their colloquial meaning, but also have formal definition as an Euler sequence. These angles are the product of the rotational equations of motion, where orientation responds to torque, just as the velocity of a vehicle responds to forces. For all flight vehicles, these two sets of dynamics, rotational and translational, operate simultaneously and in a coupled fashion to evolve the vehicle's state (orientation and velocity) trajectory.

Pitch (music)

Pitch is a perceptual property of sounds that allows their ordering on a frequency-related scale, or more commonly, pitch is the quality that makes it possible to judge sounds as "higher" and "lower" in the sense associated with musical melodies. Pitch can only be determined in sounds that have a frequency that is clear and stable enough to distinguish from noise. Pitch is a major auditory attribute of musical tones, along with duration, loudness, and timbre.

Pitch may be quantified as a frequency, but pitch is not a purely objective physical property; it is a subjective psychoacoustical attribute of sound. Historically, the study of pitch and pitch perception has been a central problem in psychoacoustics, and has been instrumental in forming and testing theories of sound representation, processing, and perception in the auditory system.

Perception of pitch

Pitch and frequency

Pitch is an auditory sensation in which a listener assigns musical tones to relative positions on a musical scale based primarily on their perception of the frequency of vibration. Pitch is closely related to frequency, but the two are not equivalent. Frequency is an objective, scientific attribute that can be measured. Pitch is each person's subjective perception of a sound, which cannot be directly measured. However, this does not necessarily mean that most people won't agree on which notes are higher and lower.