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  2. Time in physics - Wikipedia

    en.wikipedia.org/wiki/Time_in_physics

    In physics, sometimes units of measurement in which c = 1 are used to simplify equations. Time in a "moving" reference frame is shown to run more slowly than in a "stationary" one by the following relation (which can be derived by the Lorentz transformation by putting ∆x′ = 0, ∆τ = ∆t′):

  3. Unit of time - Wikipedia

    en.wikipedia.org/wiki/Unit_of_time

    The Jiffy is the amount of time light takes to travel one femtometre (about the diameter of a nucleon). The Planck time is the time that light takes to travel one Planck length. The TU (for time unit) is a unit of time defined as 1024 μs for use in engineering. The svedberg is a time unit used for sedimentation rates (usually

  4. List of common physics notations - Wikipedia

    en.wikipedia.org/wiki/List_of_common_physics...

    time constant: second (s) 6.28318... unitless phi: field strength: unit varies depending on context magnetic flux: weber (Wb) electric potential: volt (V) Higgs field work function: psi: wave function: m −3/2: omega: electric resistance ohm

  5. Lists of physics equations - Wikipedia

    en.wikipedia.org/wiki/Lists_of_physics_equations

    In physics, there are equations in every field to relate physical quantities to each other and perform calculations. Entire handbooks of equations can only summarize most of the full subject, else are highly specialized within a certain field. Physics is derived of formulae only.

  6. Time evolution - Wikipedia

    en.wikipedia.org/wiki/Time_evolution

    Then by the definition of F, F t, s (x) is the state of the system at time t and consequently applying the definition once more, F u, t (F t, s (x)) is the state at time u. But this is also F u, s (x). In some contexts in mathematical physics, the mappings F t, s are called propagation operators or simply propagators.

  7. Imaginary time - Wikipedia

    en.wikipedia.org/wiki/Imaginary_time

    Imaginary time is a mathematical representation of time that appears in some approaches to special relativity and quantum mechanics. It finds uses in certain cosmological theories. Mathematically, imaginary time is real time which has undergone a Wick rotation so that its coordinates are multiplied by the imaginary unit i .

  8. Mean motion - Wikipedia

    en.wikipedia.org/wiki/Mean_motion

    Kepler's 3rd law of planetary motion states, the square of the periodic time is proportional to the cube of the mean distance, [4] or , where a is the semi-major axis or mean distance, and P is the orbital period as above.

  9. Lissajous curve - Wikipedia

    en.wikipedia.org/wiki/Lissajous_curve

    A Lissajous figure, made by releasing sand from a container at the end of a Blackburn pendulum. A Lissajous curve / ˈ l ɪ s ə ʒ uː /, also known as Lissajous figure or Bowditch curve / ˈ b aʊ d ɪ tʃ /, is the graph of a system of parametric equations