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However, lenses are marked in terms of focal length in millimeters (e.g., average natural human field of view is a lens with 35–50 mm focal length for 35 mm film). The weight of vinyl phonograph records is reported in grams. [58] The tracking force and anti-skating settings on a turntable are measured in grams-force. [59]
The event consists of throwing a heavy disc, with the weight or size depending on the competitor. Men and women throw different sized discs, with varying sizes and weights depending on age. The weight of the discus is either governed by World Athletics for international or USA Track & Field for the United States.
The weight throw is an indoor track and field event, predominately in the US. The technique implemented to throw the weight is similar to that of the hammer throw in outdoor competition. In international competition, the men's weight is a 35 lb ball (25 for high school) with a D-ring or triangle handle attached directly to the weight.
The size, shape, minimum weight, and center of gravity of the javelin are all defined by World Athletics rules. In international competition, men throw a javelin between 2.6 and 2.7 m (8 ft 6 in and 8 ft 10 in) in length and 800 g (28 oz) in weight, and women throw a javelin between 2.2 and 2.3 m (7 ft 3 in and 7 ft 7 in) in length and 600 g ...
Standard gauge is defined both in metric and in imperial units. It is also the best-known gauge worldwide; 55% of the world uses this track. In 2020, China’s rail network is standard gauge, with around 79,685 km (49,514 mi) of line. [92] 1,440 mm 4 ft 8 + 11 ⁄ 16 in: Switzerland
Problems began as soon as lines began to meet, and standard gauge was adopted in much of the northeastern U.S. Standard gauge had spread widely across the country by the late 19th century except in some parts of the South; it was adopted there in a two-day changeover on May 31-June 1, 1886.
The dimensions of the track and equipment used must conform to standards. In road events, the course must be accurately measured, by a certified measurer. Except in road events ( road running and race walking ), the performance must be set in a single-sex race, [ 2 ] with the sole exception of the mixed-sex 4 × 400 m relay, introduced by World ...
The two basic features of a track and field stadium are the outer oval-shaped running track and an area of turf within this track—the field. In earlier competitions, track lengths varied: the Panathinaiko Stadium measured 333.33 metres at the 1896 Summer Olympics , while at the 1904 Olympics the distance was a third of a mile (536.45 m) at ...
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