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  2. List of unsolved problems in physics - Wikipedia

    en.wikipedia.org/wiki/List_of_unsolved_problems...

    The following is a list of notable unsolved problems grouped into broad areas of physics. [1]Some of the major unsolved problems in physics are theoretical, meaning that existing theories seem incapable of explaining a certain observed phenomenon or experimental result.

  3. Three-body problem - Wikipedia

    en.wikipedia.org/wiki/Three-body_problem

    The three-body problem is a special case of the n-body problem, which describes how n objects move under one of the physical forces, such as gravity. These problems have a global analytical solution in the form of a convergent power series, as was proven by Karl F. Sundman for n = 3 and by Qiudong Wang for n > 3 (see n -body problem for details).

  4. Motion - Wikipedia

    en.wikipedia.org/wiki/Motion

    Light moves at a speed of 299,792,458 m/s, or 299,792.458 kilometres per second (186,282.397 mi/s), in a vacuum. The speed of light in vacuum (or ) is also the speed of all massless particles and associated fields in a vacuum, and it is the upper limit on the speed at which energy, matter, information or causation can travel. The speed of light ...

  5. Speed - Wikipedia

    en.wikipedia.org/wiki/Speed

    Speed is the magnitude of velocity (a vector), which indicates additionally the direction of motion. Speed has the dimensions of distance divided by time. The SI unit of speed is the metre per second (m/s), but the most common unit of speed in everyday usage is the kilometre per hour (km/h) or, in the US and the UK, miles per hour (mph).

  6. Kepler problem - Wikipedia

    en.wikipedia.org/wiki/Kepler_problem

    The Kepler problem and the simple harmonic oscillator problem are the two most fundamental problems in classical mechanics. They are the only two problems that have closed orbits for every possible set of initial conditions, i.e., return to their starting point with the same velocity (Bertrand's theorem). [1]: 92

  7. Quantum counting algorithm - Wikipedia

    en.wikipedia.org/wiki/Quantum_counting_algorithm

    The quantum counting algorithm can be used to speed up solution to problems which are NP-complete. An example of an NP-complete problem is the Hamiltonian cycle problem , which is the problem of determining whether a graph G = ( V , E ) {\displaystyle G=(V,E)} has a Hamiltonian cycle .

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  9. Elementary flow - Wikipedia

    en.wikipedia.org/wiki/Elementary_flow

    Elementary flows can be considered the basic building blocks (fundamental solutions, local solutions and solitons) of the different types of equations derived from the Navier-Stokes equations. Some of the flows reflect specific constraints such as incompressible or irrotational flows, or both, as in the case of potential flow , and some of the ...

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