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  2. Central force - Wikipedia

    en.wikipedia.org/wiki/Central_force

    Central force. In classical mechanics, a central force on an object is a force that is directed towards or away from a point called center of force. [a] [1] : 93. where is the force, F is a vector valued force function, F is a scalar valued force function, r is the position vector, || r || is its length, and is the corresponding unit vector .

  3. Central Time Zone - Wikipedia

    en.wikipedia.org/wiki/Central_Time_Zone

    The North American Central Time Zone (CT) is a time zone in parts of Canada, the United States, Mexico, Central America and some Caribbean islands.. In parts of that zone (20 states in the US, three provinces or territories in Canada, and several border municipalities in Mexico), the Central Time Zone is affected by two time designations yearly: Central Standard Time (CST) is observed from the ...

  4. Central tendency - Wikipedia

    en.wikipedia.org/wiki/Central_tendency

    Central tendency. In statistics, a central tendency (or measure of central tendency) is a central or typical value for a probability distribution. [1] Colloquially, measures of central tendency are often called averages. The term central tendency dates from the late 1920s.

  5. Center of mass - Wikipedia

    en.wikipedia.org/wiki/Center_of_mass

    In physics, the center of mass of a distribution of mass in space (sometimes referred to as the barycenter or balance point) is the unique point at any given time where the weighted relative position of the distributed mass sums to zero. This is the point to which a force may be applied to cause a linear acceleration without an angular ...

  6. Classical central-force problem - Wikipedia

    en.wikipedia.org/wiki/Classical_central-force...

    t. e. In classical mechanics, the central-force problem is to determine the motion of a particle in a single central potential field. A central force is a force (possibly negative) that points from the particle directly towards a fixed point in space, the center, and whose magnitude only depends on the distance of the object to the center.

  7. Orbital period - Wikipedia

    en.wikipedia.org/wiki/Orbital_period

    Orbit insertion. v. t. e. The orbital period (also revolution period) is the amount of time a given astronomical object takes to complete one orbit around another object. In astronomy, it usually applies to planets or asteroids orbiting the Sun, moons orbiting planets, exoplanets orbiting other stars, or binary stars.

  8. Galactic Center - Wikipedia

    en.wikipedia.org/wiki/Galactic_Center

    The Galactic Center, as seen by one of the 2MASS infrared telescopes, is located in the bright upper left portion of the image. Marked location of the Galactic Center. The Galactic Center is the barycenter of the Milky Way and a corresponding point on the rotational axis of the galaxy. [1] [2] Its central massive object is a supermassive black ...

  9. Coordinated Universal Time - Wikipedia

    en.wikipedia.org/wiki/Coordinated_Universal_Time

    Coordinated Universal Time ( UTC) is the primary time standard globally used to regulate clocks and time. It establishes a reference for the current time, forming the basis for civil time and time zones. UTC facilitates international communication, navigation, scientific research, and commerce. UTC has been widely embraced by most countries and ...