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Measure of electromagnetic transmission
The velocity factor (VF) of a transmission medium is the ratio of the speed at which a wavefront (of an electromagnetic signal, a radio signal, a light
Velocity_factor
Equation in fluid dynamics
V {\displaystyle V} : velocity of the fluid. g {\displaystyle g} : acceleration due to gravity. However, the friction factor f was expressed by Weisbach
Darcy–Weisbach_equation
Measure of the fluid slip in the impeller of a compressor or a turbine
Mathematically, the Slip factor denoted by 'σ' is defined as the ratio of the actual & ideal values of the whirl velocity components at the exit of the
Slip_factor
Rate at which the phase of the wave propagates in space
(optics) Group velocity Propagation delay Shear wave splitting Wave Velocity factor Planck constant Speed of light Matter wave#Phase velocity Nemirovsky,
Phase_velocity
Parameter characterizing an AC conductor
travels at a constant phase velocity along its length, while in ordinary cable phase velocity may vary. The velocity factor V F {\displaystyle {\mathit
Electrical_length
Quantity in relativistic physics
corresponding Lorentz factor, the final is the reciprocal. Values in bold are exact. There are other ways to write the factor. Above, velocity v was used, but
Lorentz_factor
Electrical cable with concentric conductors
element T Dielectric material codes are taken from RF Cafe. VF is the velocity factor; it is determined by the effective ϵ r {\displaystyle \epsilon _{\text{r}}}
Coaxial_cable
Rate of travel of electric energy
refer to the velocity of an electron in various circumstances, the average velocity of multiple electrons in a conductor, or the velocity of electrical
Speed_of_electricity
Speed and direction of a motion
Velocity is a measurement of speed in a certain direction of motion. It is a fundamental concept in kinematics, the branch of classical mechanics that
Velocity
Front velocity Phase velocity Propagation delay Time of flight Velocity factor Dielectric constant Brillouin, Léon. Wave propagation and group velocity. Academic
Signal_velocity
Velocity of projectile the moment it leaves the gun barrel
[relevant?] Several factors, including the type of firearm, the cartridge, and the barrel length, determine the bullet's muzzle velocity. For projectiles
Muzzle_velocity
Ratio in relativity
to an object's energy as well. Proper velocity w can be related to the ordinary velocity v via the Lorentz factor γ: w = d x d t d t d τ = v γ ( v ) {\displaystyle
Proper_velocity
Ranking system for the momentum of pistol cartridges in competitive practical shooting
mass and velocity), which to some degree reflects the recoil impulse from the firearm onto the shooter (see section on limitations). Power factor is used
Power factor (shooting sports)
Power_factor_(shooting_sports)
Flow of electric charge
electromagnetic wave to the speed of light in free space is called the velocity factor, and depends on the electromagnetic properties of the conductor and
Electric_current
Velocity at which the overall shape of a wave's amplitudes propagates
The group velocity of a wave is the velocity with which the overall envelope shape of the wave's amplitudes—known as the modulation or envelope of the
Group_velocity
Dynamic disturbance in a medium or field
Shallow water equations Shive wave machine Sound Transmission medium Velocity factor Wave power Wave turbulence (Hall 1980, p. 8) Pragnan Chakravorty, "What
Wave
Concept in celestial mechanics
In celestial mechanics, escape velocity or escape speed is the minimum speed needed for an object to escape from contact with or orbit of a primary body
Escape_velocity
Time for a signal or other quantity to reach its destination
nanosecond per 15 centimetres (5.9 in). See also radio propagation, velocity factor, signal velocity, and mechanical wave. Logic gates have a gate delay ranging
Propagation_delay
Form of shear stress
Shear velocity, also called friction velocity, is a form by which a shear stress may be re-written in units of velocity. It is useful as a method in fluid
Shear_velocity
Topics referred to by the same term
Slimetime Nominal velocity of propagation, the speed with which electrical signals travels through various types of conductors; see velocity factor This disambiguation
NVP_(disambiguation)
Speed at which an electrochemical impulse propagates down a neural pathway
nerve conduction velocity (CV) is the speed at which an electrochemical impulse propagates down a neural pathway. Conduction velocities are affected by
Nerve_conduction_velocity
Rate of money changing hands
The velocity of money changes over time and is influenced by a variety of factors. Because of the nature of financial transactions, the velocity of money
Velocity_of_money
Speed of electromagnetic waves
dilation factor of γ = 2 occurs at a relative velocity of approximately 86.6% of the speed of light (v ≈ 0.866c). Similarly, a time dilation factor of γ =
Speed_of_light
Analogue of velocity in four-dimensional spacetime
relativity, a four-velocity is a four-vector in four-dimensional spacetime that represents the relativistic counterpart of velocity, which is a three-dimensional
Four-velocity
Speed at which relativistic effects become significant
Lorentz factor is a measure of time dilation, length contraction and the relativistic mass increase of a moving object. Lorentz factor Relative velocity Relativistic
Relativistic_speed
Resonator damping parameter
quality factor or Q factor is a dimensionless parameter that describes how underdamped an oscillator or resonator is. Resonators with high quality factors have
Q_factor
Physical model of propagating energy
lower velocity v {\displaystyle v} , given by a dimensionless parameter between 0 and 1 characteristic of the medium called the velocity factor V F {\displaystyle
Electromagnetic_radiation
Speed of sound wave through elastic medium
missing the factor of γ but was otherwise correct. Numerical substitution of the above values gives the ideal gas approximation of sound velocity for gases
Speed_of_sound
Network service quality
200,000 km/s for most fiber or electrical media, depending on their velocity factor). This approximately means an additional millisecond round-trip delay
Network_performance
be calculated using Chapman–Jouguet theory from the velocity and density. TNT equivalent RE factor Cooper, Paul W. (1996). Explosives Engineering, New
Table of explosive detonation velocities
Table_of_explosive_detonation_velocities
Lowering of body temperature due to the passing flow of lower-temperature air
in temperature between the surface and the fluid surrounding it and the velocity of that fluid with respect to the surface. As heat is initially transferred
Wind_chill
Equation used in relativistic physics
In relativistic physics, a velocity-addition formula is an equation that specifies how to combine the velocities of objects in a way that is consistent
Velocity-addition_formula
Formula made to approximate a bullet's stopping power
when the brain is missed. The Taylor KO factor multiplies bullet mass (measured in grains) by muzzle velocity (measured in feet per second) by bullet
Taylor_knock-out_factor
Property in optics
Prism-coupling refractometry Velocity factor One consequence of the real part of n being less than unity is that it implies that the phase velocity inside the material
Refractive_index
Time it takes a transmitter to send message
actual propagation speed to the speed of light is also called the velocity factor of the medium. The propagation delay of a physical link can be calculated
Transmission_time
Fictional superluminal spacecraft propulsion system
time is precisely mathematically specified by the Lorentz factor, which depends on velocity. Although only theoretical when published over 100 years ago
Warp_drive
Measured time difference as explained by relativity theory
in elapsed time as measured by two clocks, either because of a relative velocity, a consequence of special relativity, or a difference in gravitational
Time_dilation
Turbine in which working fluid flows parallel to the shaft
the impulse stages, the gas velocities are relatively low. Besides this the flow is accelerating throughout. These factors make the reaction stages aerodynamically
Axial_turbine
Ratio of inertial to viscous forces acting on a liquid
multiply the whole equation by the factor L ρ V 2 , {\displaystyle {\frac {L}{\rho V^{2}}},} where V is the mean velocity, v or v, relative to the fluid (m/s)
Reynolds_number
.22 caliber rimfire cartridge used in rifles, pistols, revolvers, and submachine guns
achieve the same or better accuracy. A contributing factor in rifles is the transition of even a high-velocity cartridge projectile from supersonic to subsonic
.22_long_rifle
Measurement of distance
the inverse scale factor term 1 / a ( t ′ ) {\displaystyle 1/a(t')} in the integrand. By "comoving speed of light", we mean the velocity of light through
Comoving_and_proper_distances
Increase in distance between parts of the universe
over time by the same factor. Uniform expansion is equivalent to the observed linear relationship between the recession velocities v → {\displaystyle {\vec
Expansion_of_the_universe
Pinched tube generating supersonic flow
isentropic expansion factor γ = 1.22 and a molar mass M = 22 kg/kmol. Using those values in the above equation yields an exhaust velocity ve = 2802 m/s, or
De_Laval_nozzle
American military term
hourly meteorological message. Since precise measurements of muzzle velocity (factor #1) often could not be made, estimates were used, based upon the size
Coast Artillery fire control system
Coast_Artillery_fire_control_system
Meter used to measure water current velocities
to the water velocity along the acoustic path. To measure 3D velocities, at least three beams are required. In rivers, only the 2D velocity is relevant
Acoustic Doppler current profiler
Acoustic_Doppler_current_profiler
Mathematical expression for the stability of rocks in water currents
1 to 3 kh for an undeveloped velocity profile: ( 1 + h d ) 0.2 {\displaystyle (1+{\frac {h}{d}})^{0.2}} Ks = slope factor The value of Ks corresponds to
Izbash_formula
Ratio between local shear stress and bulk dynamic pressure within a flow
{\displaystyle {\bar {u}}} is the flow velocity averaged on the flow cross section From the chart, it is evident that the friction factor is never zero, even for smooth
Fanning_friction_factor
Number used to correct drag calculations for small particles in a fluid
In fluid dynamics, the Cunningham correction factor, or Cunningham slip correction factor (denoted C), is used to account for non-continuum effects when
Cunningham_correction_factor
Measure used in radio engineering and telecommunications
20 MHz (free space wavelength of 15 m) in a transmission line whose velocity factor is 0.67 , the guided wavelength (distance between voltage peaks of
Standing_wave_ratio
Model for stock portfolio management
Momentum is the speed or velocity of price changes in a stock, security, or tradable instrument. The Monthly Momentum Factor (MOM) can be calculated by
Carhart_four-factor_model
2001 video game
F-Zero: Maximum Velocity is a 2001 racing game developed by NDcube and published by Nintendo as a launch title for the Game Boy Advance. It was the first
F-Zero:_Maximum_Velocity
Ultraviolet catastrophe Undertow (wave action) Underwater wave Undular bore Velocity factor Vestigial-sideband modulation Vibrating string Voltage standing wave
Index_of_wave_articles
How quickly an object undergoes movement in a circular path
rotational velocity, a vector whose magnitude is the rotational speed. (Angular speed and angular velocity are related to the rotational speed and velocity by
Tangential_speed
Change in velocity per amount of fuel
rate are limiting factors to the fuel consumption rate. As with rocket engines, the interpretation of specific impulse as a "velocity" does not actually
Specific_impulse
Physical or perceived use of energy by a person
oxygen consumption. Muscular exertion generated depends on force and velocity. Factors influencing these are muscle cross-section, muscle length, muscle
Exertion
Method of teaching special relativity
{k-k^{-1}}{k+k^{-1}}}.} This equation expresses velocity as a function of the Bondi k-factor. It can be solved for k {\displaystyle k} to give k {\displaystyle
Bondi_k-calculus
Structures of the Earth's mantle
Large low-shear-velocity provinces (LLSVPs), also called large low-velocity provinces (LLVPs) or superplumes, are characteristic structures within the
Large low-shear-velocity provinces
Large_low-shear-velocity_provinces
Antenna constructions for different applications
ratio of the actual speed in the antenna to the free-space velocity is called the velocity factor V F = c c 0 , {\displaystyle \ V_{\mathsf {F}}={\tfrac
Antenna_types
Study of the movement of stars
through space. Stellar kinematics encompasses the measurement of stellar velocities in the Milky Way and its satellites as well as the internal kinematics
Stellar_kinematics
Equations for calculations of the Darcy friction factor
fluid dynamics, the Darcy friction factor formulae are equations that allow the calculation of the Darcy friction factor, a dimensionless quantity used in
Darcy friction factor formulae
Darcy_friction_factor_formulae
Rate at which air moves from high- to low-pressure areas
velocity of an aircraft. Wind speed is a common factor in the design of structures and buildings around the world. It is often the governing factor in
Wind_speed
Term from classical mechanics
In classical mechanics, areal velocity (also called sector velocity or sectorial velocity) is a pseudovector whose length equals the rate of change at
Areal_velocity
Early electronic transmission line medium
microstrip lines, which in turn reduces wave propagation speed (see also velocity factor) according to v p = c 0 ϵ r , e f f . {\displaystyle v_{\mathrm {p}
Stripline
Fictional character
Velocity (real name Carin Taylor) is an Image Comics/Top Cow Productions superhero from the comic series Cyberforce, created by Marc Silvestri in 1992
Velocity_(character)
Annular velocity is the speed of the drilling fluid's movement in a column called an annulus in oil wells. It is commonly measured in feet per minute (ft/min)
Annular_velocity
Cable or other structure for carrying radio waves
transmission line to what it would be in free-space. Consequently, the velocity factor of the material the transmission line is made of needs to be taken
Transmission_line
{v_{r}}{g}}{\sqrt {\frac {k}{m}}}} The dynamic factor will always be larger than 1 because there will always be a velocity difference between the crane hook and
Offshore_crane_shock_absorber
Concept in condensed matter physics
In wave mechanics, anomalous velocity refers to the group velocity of a wave packet that is transverse to an applied electric field, arising even in the
Anomalous_velocity
characteristic of boundary layer flow is that at the solid walls, the fluid's velocity is reduced to zero. The boundary layer refers to the thin transition layer
Boundary_layer_thickness
SI unit of angular velocity or angular frequency
additional factor will generally be necessary. Cycle per second Normalized frequency (digital signal processing) Order of magnitude (angular velocity) Radian
Radian_per_second
Number of rotations per unit time
rotation, T=ν−1=n−1, with dimension of time (SI unit seconds). Rotational velocity is the vector quantity whose magnitude equals the scalar rotational speed
Rotational_frequency
Relation between friction factor and Reynolds number
the Turkish chemical engineer Sabri Ergun in 1952, expresses the friction factor in a packed column as a function of the modified Reynolds number. f p =
Ergun_equation
Pistol cartridge
higher than typical 9mm rounds, with velocity sometimes exceeding 1,550 ft/s (470 m/s) to achieve a power factor of 165. This classification benefits
9mm_Major
field. Achieving warp factor 1 is equal to breaking the light barrier, while the actual velocity corresponding to higher factors is determined using an
Technology_in_Star_Trek
Specific probability distribution function, important in physics
chi distribution with three degrees of freedom (the components of the velocity vector in Euclidean space), with a scale parameter measuring speeds in
Maxwell–Boltzmann distribution
Maxwell–Boltzmann_distribution
Cable or conductor connecting a radio transmitter to an antenna
characteristics of a few common feedline types Cable type Nominal impedance (Ω) Velocity factor (% c) radio coax 50 66 (solid) 80 (foam) video coax 75 twin-lead ribbon
Antenna_feed
Volume of fluid which passes per unit time
{\mathbf {n} }}} and the velocity vector v of the substance elements. The amount passing through the cross-section is reduced by the factor cos θ. As θ increases
Volumetric_flow_rate
Phenomenon of fluid mechanics
a fluid instability that occurs when there is velocity shear in a single continuous fluid or a velocity difference across the interface between two fluids
Kelvin–Helmholtz_instability
Device which measures fluid flow velocity, typically around an aircraft or boat
A pitot tube (/ˈpiːtoʊ/ PEE-toh; also pitot probe) measures fluid flow velocity. It was invented by French engineer Henri Pitot during his work with aqueducts
Pitot_tube
Classical method used to design feedback control systems
Then the next loop (the velocity loop in the telescope example) is designed. The bandwidth of this sub-system is set to be a factor of 3 to 5 less than the
Minor_loop_feedback
Rifle cartridge
high velocity. Besides hunting applications, the cartridge is popular with target and metallic silhouette shooters for those same recoil and velocity properties
.243_Winchester
in quantifying the biological factors and mathematics that govern sprinting. In order to achieve these high velocities, it has been found that sprinters
Biomechanics of sprint running
Biomechanics_of_sprint_running
Measure of a device's efficiency at allowing fluid flow
inlet pressure, the flow becomes quite simple (although it reaches sonic velocity internally). With Cv = 1.0 and 200 psia inlet pressure, the flow is 100
Flow_coefficient
Family of linear transformations
a constant velocity relative to the former. The respective inverse transformation is then parameterized by the negative of this velocity. The transformations
Lorentz_transformation
Process of formation of blood clots
platelets, and the exposure of subendothelial platelet tissue factor to coagulation factor VII, which ultimately leads to cross-linked fibrin formation
Coagulation
Cosmological formulas for expanding universe
functions of scale factor a = 1 / ( 1 + z ) . {\displaystyle a=1/(1+z).} In the remainder of this article, the peculiar velocity is assumed to be negligible
Distance_measure
Ratio of static enthalpy change within a turbomachine to that of the whole stage
rotor outlet at 3. The velocity triangle (Figure 2.) for the flow process within the stage represents the change in fluid velocity as it flows first in
Degree_of_reaction
River section with increased velocity and turbulence
gradient, causing an increase in water velocity and turbulence. Flow, gradient, constriction, and obstacles are four factors that are needed for a rapid to be
Rapids
Law describing the pressure drop in an incompressible and Newtonian fluid
friction factor, the energy (head) loss factor, friction loss factor or Darcy (friction) factor Λ in the laminar flow at very low velocities in cylindrical
Hagen–Poiseuille_equation
Estimate of velocity in open channel flows
formula or Manning's equation is an empirical formula estimating the average velocity of a liquid in an open channel flow (flowing in a conduit that does not
Manning_formula
Theories of quantum chemistry explained via relativistic mechanics
c {\displaystyle \gamma ,m_{e},v_{e},c} are the Lorentz factor, electron rest mass, velocity of the electron, and speed of light respectively. The figure
Relativistic quantum chemistry
Relativistic_quantum_chemistry
Measure of arterial stiffness
Pulse wave velocity (PWV) is the velocity at which the blood pressure pulse propagates through the circulatory system, usually an artery or a combined
Pulse_wave_velocity
Baseball statistic
record exit velocity data for a batted ball, either because of ballpark factors or some other reason, it imputes a value in its place. Exit velocity can vary
Exit_velocity
Rate of change of angle
(or angular speed) is the magnitude of the pseudovector quantity angular velocity. Angular frequency can be obtained by multiplying rotational frequency
Angular_frequency
Loss of fluid flow through friction
at a velocity V = 2.17 m/s (meters per second). The following table gives Reynolds number Re, Darcy friction factor fD, flow rate Q, and velocity V such
Friction_loss
the fluid and reduce its energy, velocity, or momentum. Friction and minor losses in pipes are major contributing factors. Before being able to use the minor
Minor_losses_in_pipe_flow
Seismic zone (geology)
In geology, the low-velocity zone (LVZ) occurs close to the boundary between the lithosphere and the asthenosphere in the upper mantle. It is characterized
Low-velocity_zone
Concrete quality test
cracks and defects in concrete. The important factors that affect/influence the ultrasonic pulse velocity test are: Surface Conditions of Concrete Moisture
Ultrasonic pulse velocity test
Ultrasonic_pulse_velocity_test
Seismic wave velocity variation
seismic velocity by softening the rock, the predominant factor in the lower mantle remains the increase in pressure. Average P-wave velocity: 8.0–10 km/s
Seismic_velocity_structure
Injury caused by a bullet
S2CID 34589917. ...the temporary cavity is the most important factor in wound ballistics of high velocity rifle bullets...the importance of the temporary cavity
Gunshot_wound
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