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  2. List of common physics notations - Wikipedia

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

    Cartesian y-axis basis unit vector unitless kinetic energy: joule (J) wave vector: radian per meter (m −1) Boltzmann constant: joule per kelvin (J/K) wavenumber: radian per meter (m −1) stiffness: newton per meter (N⋅m −1) ^ Cartesian z-axis basis unit vector

  3. Crossword abbreviations - Wikipedia

    en.wikipedia.org/wiki/Crossword_abbreviations

    Taking this one stage further, the clue word can hint at the word or words to be abbreviated rather than giving the word itself. For example: "About" for C or CA (for "circa"), or RE. "Say" for EG, used to mean "for example". More obscure clue words of this variety include: "Model" for T, referring to the Model T.

  4. Germanium - Wikipedia

    en.wikipedia.org/wiki/Germanium

    2 Ge. Germanium cluster anions (Zintl ions) such as Ge 4 2−, Ge 9 4−, Ge 9 2−, [(Ge 9) 2] 6− have been prepared by the extraction from alloys containing alkali metals and germanium in liquid ammonia in the presence of ethylenediamine or a cryptand. [42] [44] The oxidation states of the element in these ions are not integers—similar to ...

  5. Crossword - Wikipedia

    en.wikipedia.org/wiki/Crossword

    Crossword-like puzzles, for example Double Diamond Puzzles, appeared in the magazine St. Nicholas, published since 1873. [32] Another crossword puzzle appeared on September 14, 1890, in the Italian magazine Il Secolo Illustrato della Domenica. It was designed by Giuseppe Airoldi and titled "Per passare il tempo" ("To pass the time"). Airoldi's ...

  6. Einstein's thought experiments - Wikipedia

    en.wikipedia.org/wiki/Einstein's_thought_experiments

    General relativity informs us that while the box has been at a height different than its original height, it has been ticking at a rate different than its original rate. The red shift formula informs us that there will be an uncertainty Δ t = c − 2 g t Δ q {\displaystyle \Delta t=c^{-2}gt\Delta q} in the determination of t 0 ...

  7. Threshold energy - Wikipedia

    en.wikipedia.org/wiki/Threshold_energy

    In most cases, since momentum is also conserved, the threshold energy is significantly greater than the rest energy of the desired particle. The threshold energy should not be confused with the threshold displacement energy , which is the minimum energy needed to permanently displace an atom in a crystal to produce a crystal defect in radiation ...

  8. List of particles - Wikipedia

    en.wikipedia.org/wiki/List_of_particles

    A bradyon (or tardyon) travels slower than the speed of light in vacuum and has a non-zero, real rest mass. A luxon travels as fast as light in vacuum and has no rest mass. A tachyon is a hypothetical particle that travels faster than the speed of light so they would paradoxically experience time in reverse (due to inversion of the theory of ...

  9. Mathematics of general relativity - Wikipedia

    en.wikipedia.org/wiki/Mathematics_of_general...

    For ranks greater than two, the symmetric or antisymmetric index pairs must be explicitly identified. Antisymmetric tensors of rank 2 play important roles in relativity theory. The set of all such tensors - often called bivectors — forms a vector space of dimension 6, sometimes called bivector space.

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