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  2. Foucault's measurements of the speed of light - Wikipedia

    en.wikipedia.org/wiki/Foucault's_measurements_of...

    With a rotational speed of 600-800 revolutions per second, the displacement was 0.2 to 0.3 mm. [5]: 128–129 Guided by similar motivations as his former partner, Foucault in 1850 was more interested in settling the particle-versus-wave debate than in determining an accurate absolute value for the speed of light. [ 2 ] [

  3. Speed of electricity - Wikipedia

    en.wikipedia.org/wiki/Speed_of_electricity

    The drift velocity deals with the average velocity of a particle, such as an electron, due to an electric field. In general, an electron will propagate randomly in a conductor at the Fermi velocity. [5] Free electrons in a conductor follow a random path. Without the presence of an electric field, the electrons have no net velocity.

  4. Tangential speed - Wikipedia

    en.wikipedia.org/wiki/Tangential_speed

    Tangential speed is the speed of an object undergoing circular motion, i.e., moving along a circular path. [ 1] A point on the outside edge of a merry-go-round or turntable travels a greater distance in one complete rotation than a point nearer the center. Travelling a greater distance in the same time means a greater speed, and so linear speed ...

  5. Drift velocity - Wikipedia

    en.wikipedia.org/wiki/Drift_velocity

    Drift velocity. In physics, drift velocity is the average velocity attained by charged particles, such as electrons, in a material due to an electric field. In general, an electron in a conductor will propagate randomly at the Fermi velocity, resulting in an average velocity of zero. Applying an electric field adds to this random motion a small ...

  6. Relativistic speed - Wikipedia

    en.wikipedia.org/wiki/Relativistic_speed

    Speed is a scalar, being the magnitude of the velocity vector which in relativity is the four-velocity and in three-dimension Euclidean space a three-velocity. Speed is empirically measured as average speed, although current devices in common use can estimate speed over very small intervals and closely approximate instantaneous speed.

  7. Characteristic velocity - Wikipedia

    en.wikipedia.org/wiki/Characteristic_velocity

    Characteristic velocity. Characteristic velocity or , or C-star is a measure of the combustion performance of a rocket engine independent of nozzle performance, and is used to compare different propellants and propulsion systems. c* should not be confused with c, which is the effective exhaust velocity related to the specific impulse by: .

  8. Apache Velocity - Wikipedia

    en.wikipedia.org/wiki/Apache_Velocity

    Apache Velocity first released in April 2001, is a Java -based template engine that provides a template language to reference objects defined in Java code. It aims to ensure clean separation between the presentation tier and business tiers in a Web application (the model–view–controller design pattern). Velocity is an open source software ...

  9. Revolutions per minute - Wikipedia

    en.wikipedia.org/wiki/Revolutions_per_minute

    On many kinds of disc recording media, the rotational speed of the medium under the read head is a standard given in rpm. Phonograph (gramophone) records, for example, typically rotate steadily at 16 + 2 ⁄ 3, 33 + 1 ⁄ 3, 45 rpm or 78 rpm (0.28, 0.55, 0.75, or 1.3, respectively, in Hz). Air turbine rotating up to 1 500 000 rpm (25 kHz)

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