# Velocity

## Meanings and phrases

n.

- distance travelled per unit time; speed

n.

- (physics) the rate of change of the angular position of a rotating body; usually expressed in radians per second or radians per minute

- 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").

n.

- the minimum velocity needed to escape a gravitational field

- 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.

n.

- the velocity of a projectile as it leaves the muzzle of a gun

- Their shells were fired at a muzzle velocity of .

n.

- velocity with respect to the local standard of rest

n.

- velocity along the line of sight toward or away from the observer

- 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.

n.

- the constant maximum velocity reached by a body falling through the atmosphere under the attraction of gravity

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.

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.

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.

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.

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.

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").

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.

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).

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.

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.