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Mean free path. In physics, mean free path is the average distance over which a moving particle (such as an atom, a molecule, or a photon) travels before substantially changing its direction or energy (or, in a specific context, other properties), typically as a result of one or more successive collisions with other particles.
A modern small-scale cattle drive in New Mexico. Cattle drives were a major economic activity in the 19th and early 20th century American West, particularly between 1850s and 1910s. In this period, 27 million cattle were driven from Texas to railheads in Kansas, for shipment to stockyards in St. Louis and points east, and direct to Chicago.
Traffic flow. In transportation engineering, traffic flow is the study of interactions between travellers (including pedestrians, cyclists, drivers, and their vehicles) and infrastructure (including highways, signage, and traffic control devices), with the aim of understanding and developing an optimal transport network with efficient movement ...
Overview. Mean time between failures (MTBF) describes the expected time between two failures for a repairable system. For example, three identical systems starting to function properly at time 0 are working until all of them fail. The first system fails after 100 hours, the second after 120 hours and the third after 130 hours.
The three second rule is a time for the defensive driver to judge the minimum safe trailing distance to help avoid collisions under ideal driving conditions. The red car's driver picks a tree to judge a two-second safety buffer. The two-second rule is a rule of thumb by which a driver may maintain a safe trailing distance at any speed.
The "highway" program or Highway Fuel Economy Driving Schedule (HWFET) is defined in 40 CFR 600.I and uses a warmed-up engine and makes no stops, averaging 48 mph (77 km/h) with a top speed of 60 mph (97 km/h) over a 10-mile (16 km) distance. A weighted average of city (55%) and highway (45%) fuel economies is used to determine the combined ...
Mean free time. Molecules in a fluid constantly collide with each other. The mean free time for a molecule in a fluid is the average time between collisions. The mean free path of the molecule is the product of the average speed and the mean free time. [ 1] These concepts are used in the kinetic theory of gases to compute transport coefficients ...
Average path length. Average path length, or average shortest path length is a concept in network topology that is defined as the average number of steps along the shortest paths for all possible pairs of network nodes. It is a measure of the efficiency of information or mass transport on a network.
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