A popular running distance also known as a 5 km, colloquially "five-K". This distance is typical for all types of running races; from cross-country, to the road, to the track. Man Running - Edward Muybridge Horse Running - Edward Muybridge Running is by definition the fastest means for an animal to move on foot. ... A race is a population of humans distinguished from other populations. ... The term cross-country, when used by itself, can refer to: Cross-country running Cross-country skiing Cross-country equestrianism Cross-country or XC mountain biking Fell running also known as hill running and mountain running This is a disambiguation page — a navigational aid which lists other pages that might...
Much of the distances popularity is due to the challenge it offers to both beginner runners and accomplished professionals. It is a distance race that also demands a great deal of speed, and the combination make it attractive to many. The world record for men is 12:37.35 by Ethiopian Kenenisa Bekele. The womens record is 14:24.68 by Elvan Abeylegesse.
The characteristic length of a cylinder perpendicular to the flow is its diameter.
For a characteristic length of 0.02 m, the Re number is reduced by 50 times that for a characteristic length of 1 m,.
By increasing the fan speed 22 % at a 5000m altitude (the air density is 54 % of that at sea level), the horsepower required from the fan motor remains constant.
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