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Velocity

Meanings and phrases

velocity

Pronunciation American British Australian Indian
n.
  1. distance travelled per unit time; speed

angular velocity

Pronunciation American British Australian Indian
n.
  1. (physics) the rate of change of the angular position of a rotating body; usually expressed in radians per second or radians per minute
E.g.
  • The sign convention for angular momentum is the same as that for angular velocity.
  • Before hovering the object moved slowly, with the angular velocity of a passenger aircraft.
  • The velocity of each point X is where ω is the angular velocity vector and v is the derivative of d("t").

escape velocity

Pronunciation American British Australian Indian
n.
  1. the minimum velocity needed to escape a gravitational field
E.g.
  • At 200 AU from the Sun, the escape velocity from the Sun is 2.98 km/s.
  • Such stars may have velocities so great that they exceed the escape velocity of the galaxy.
  • The escape velocity from Earth's surface is about 11 200 m/s, and is irrespective of the direction of the object.

muzzle velocity

Pronunciation American British Australian Indian
n.
  1. the velocity of a projectile as it leaves the muzzle of a gun
E.g.
  • Their shells were fired at a muzzle velocity of .

peculiar velocity

Pronunciation American British Australian Indian
n.
  1. velocity with respect to the local standard of rest

radial velocity

Pronunciation American British Australian Indian
n.
  1. velocity along the line of sight toward or away from the observer
E.g.
  • This frequency is converted to radial velocity.
  • The planet was discovered by the radial velocity method.
  • It is drifting closer with a radial velocity of −26 km/s.

terminal velocity

Pronunciation American British Australian Indian
n.
  1. the constant maximum velocity reached by a body falling through the atmosphere under the attraction of gravity

rotational velocity

Pronunciation American British Australian Indian
E.g.
  • It has a projected rotational velocity of 225 km/s.
  • The projected rotational velocity is 186 km/s.
  • The star is spinning with a projected rotational velocity of 9.6 km/s.

high velocity

Pronunciation American British Australian Indian
E.g.
  • Dalkowski's claim to fame was the high velocity of his fastball.
  • They are constructed to hold up during close range, high velocity impacts.
  • Maverick is negatively affected by unfavorable weather conditions as a high velocity ride.

projected rotational velocity

Pronunciation American British Australian Indian
E.g.
  • It has a projected rotational velocity of 225 km/s.
  • The projected rotational velocity is 186 km/s.
  • The star is spinning with a projected rotational velocity of 9.6 km/s.

flow velocity

Pronunciation American British Australian Indian
E.g.
  • All these discussions treated flame stretch as an effect of flow velocity gradients.
  • Laser Doppler Flowmetry utilizes light instead of ultrasound to detect flow velocity.
  • Density, flow velocity, and an additional property, viscosity, are used to classify flow fields.

heliocentric radial velocity

Pronunciation American British Australian Indian
E.g.
  • It is moving closer with a heliocentric radial velocity of −44 km/s.
  • It is moving closer with a heliocentric radial velocity of −37 km/s.
  • It is moving closer with a heliocentric radial velocity of −17 km/s.

velocity vector

Pronunciation American British Australian Indian
E.g.
  • The medium contains small optical absorbers moving with velocity vector formula_1.
  • Speed, the scalar magnitude of a velocity vector, denotes only how fast an object is moving.
  • The velocity of each point X is where ω is the angular velocity vector and v is the derivative of d("t").

relative velocity

Pronunciation American British Australian Indian
E.g.
  • In other words, only relative velocity can be calculated.
  • The dynamic pressure on a rocket varies with air density and the square of relative velocity.
  • In Newtonian mechanics, the relative velocity is independent of the chosen inertial reference frame.

group velocity

Pronunciation American British Australian Indian
E.g.
  • The group velocity of a wave may also exceed "c" in some circumstances.
  • In dispersive media the phase velocity is not necessarily the same as the group velocity.
  • However, group velocity can exceed "c" in some parts of a Gaussian beam in a vacuum (without attenuation).

phase velocity

Pronunciation American British Australian Indian
E.g.
  • From () we obtain the phase velocity formula_27.
  • The phase velocity varies with frequency.
  • In dispersive media the phase velocity is not necessarily the same as the group velocity.

constant velocity

Pronunciation American British Australian Indian
E.g.
  • Assume that balls travel with constant velocity.
  • Inertia therefore applies equally well to constant velocity motion as it does to rest.
  • Galileo concluded that motion in a constant velocity was completely equivalent to rest.
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