velocity function
1velocity function — noun : the distribution of the velocities of the stars in a given region of space …
2Velocity potential — A velocity potential is used in fluid dynamics, when a fluid occupies a simply connected region and is irrotational. In such a case,: abla imes mathbf{u} =0,where mathbf{u} denotes the flow velocity of the fluid. As a result, mathbf{u} can be… …
3Velocity receiver — A velocity receiver is a sensor that responds to velocity rather than absolute position.For example, dynamic microphones are velocity receivers.Likewise, many electronic keyboards used for music are velocity sensitive, and may be said to possess… …
4Velocity air meter — A Velocity air meter measures the force of air rushing into an engine against a spring loaded door in an air tunnel. A linear potentiometer rotated along with the hinge of the air door measures the angle of the opening and sends an electrical… …
5Stream function — The stream function is defined for two dimensional flows of various kinds. The stream function can be used to plot streamlines, which represent the trajectories of particles in a steady flow. Streamlines are perpendicular to equipotential lines.… …
6Stokes stream function — In fluid dynamics, the Stokes stream function is used to describe the streamlines and flow velocity in a three dimensional incompressible flow with axisymmetry. A surface with a constant value of the Stokes stream function encloses a streamtube,… …
7Group velocity — [ Frequency dispersion in bichromatic groups of gravity waves on the surface of deep water. The red dot moves with the phase velocity, and the green dots propagate with the group velocity. In this deep water case, the phase velocity is twice the… …
8Distribution function — This article describes the distribution function as used in physics. You may be looking for the related mathematical concepts of cumulative distribution function or probability density function. In molecular kinetic theory in physics, a particle… …
9Differential of a function — For other uses of differential in mathematics, see differential (mathematics). In calculus, the differential represents the principal part of the change in a function y = ƒ(x) with respect to changes in the independent variable. The… …
10Four-velocity — In physics, in particular in special relativity and general relativity, the four velocity of an object is a four vector (vector in four dimensional spacetime) that replaces classical velocity (a three dimensional vector). It is chosen in such a… …
