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2. Flange focal distance - Wikipedia

   en.wikipedia.org/wiki/Flange_focal_distance

   Diagram illustrating the flange focal length of an SLR–type and a mirrorless–type camera. For an interchangeable lens camera, the flange focal distance (FFD) (also known as the flange-to-film distance, flange focal depth, flange back distance (FBD), flange focal length (FFL), back focus or register, depending on the usage and source) of a lens mount system is the distance from the mounting ...

3. Angular velocity - Wikipedia

   en.wikipedia.org/wiki/Angular_velocity

   Classical mechanics. In physics, angular velocity (symbol ω or , the lowercase Greek letter omega ), also known as angular frequency vector, [1] is a pseudovector representation of how the angular position or orientation of an object changes with time, i.e. how quickly an object rotates (spins or revolves) around an axis of rotation and how ...

4. Longitude - Wikipedia

   en.wikipedia.org/wiki/Longitude

   Geodesy. Longitude ( / ˈlɒndʒɪtjuːd /, AU and UK also / ˈlɒŋɡɪ -/) [1] [2] is a geographic coordinate that specifies the east – west position of a point on the surface of the Earth, or another celestial body. It is an angular measurement, usually expressed in degrees and denoted by the Greek letter lambda (λ).

5. Force between magnets - Wikipedia

   en.wikipedia.org/wiki/Force_between_magnets

   where r is the distance-vector from dipole moment m 1 to dipole moment m 2, with r = ‖ r ‖. The force acting on m 1 is in opposite direction. As an example the magnetic force for two magnets pointing in the z-direction and aligned on the z-axis and separated by the distance z is:

6. Speed - Wikipedia

   en.wikipedia.org/wiki/Speed

   L T−1. In everyday use and in kinematics, the speed (commonly referred to as v) of an object is the magnitude of the change of its position over time or the magnitude of the change of its position per unit of time; it is thus a scalar quantity. [1] The average speed of an object in an interval of time is the distance travelled by the object ...

7. Light-year - Wikipedia

   en.wikipedia.org/wiki/Light-year

   A light-year, alternatively spelled light year ( ly ), is a unit of length used to express astronomical distances and is equal to exactly 9,460,730,472,580.8 km (Scientific notation: 9.4607304725808 × 10 12 km) , which is approximately 5.88 trillion mi. As defined by the International Astronomical Union (IAU), a light-year is the distance that ...