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  2. Ehrenfest paradox - Wikipedia

    en.wikipedia.org/wiki/Ehrenfest_paradox

    The Ehrenfest paradox concerns the rotation of a "rigid" disc in the theory of relativity.. In its original 1909 formulation as presented by Paul Ehrenfest in relation to the concept of Born rigidity within special relativity, [1] it discusses an ideally rigid cylinder that is made to rotate about its axis of symmetry. [2]

  3. Von Kármán swirling flow - Wikipedia

    en.wikipedia.org/wiki/Von_Kármán_swirling_flow

    Von Kármán swirling flow is a flow created by a uniformly rotating infinitely long plane disk, named after Theodore von Kármán who solved the problem in 1921. [1] The rotating disk acts as a fluid pump and is used as a model for centrifugal fans or compressors.

  4. Homopolar generator - Wikipedia

    en.wikipedia.org/wiki/Homopolar_generator

    A homopolar generator is a DC electrical generator comprising an electrically conductive disc or cylinder rotating in a plane perpendicular to a uniform static magnetic field. A potential difference is created between the center of the disc and the rim (or ends of the cylinder) with an electrical polarity that depends on the direction of ...

  5. Flettner rotor - Wikipedia

    en.wikipedia.org/wiki/Flettner_rotor

    The Buckau, the first vehicle to be propelled by a Flettner rotor. A Flettner rotor is a smooth cylinder with disc end plates which is spun along its long axis and, as air passes at right angles across it, the Magnus effect causes an aerodynamic force to be generated in the direction perpendicular to both the long axis and the direction of airflow. [1]

  6. Disc tumbler lock - Wikipedia

    en.wikipedia.org/wiki/Disc_tumbler_lock

    The underside of a disc tumbler lock A key for a disc tumbler lock. A disc tumbler or disc detainer lock is a lock composed of slotted rotating detainer discs. The lock was invented by Finnish founder of Abloy, Emil Henriksson (1886–1959) in 1907 and first manufactured under the Abloy brand in 1918. [a] [1]

  7. Revolving cylinder engine - Wikipedia

    en.wikipedia.org/wiki/Revolving_Cylinder_Engine

    Most revolving cylinder, axial piston engine designs utilize a fixed, multi-lobed barrel-type cam and rollers on the pistons to control the reciprocating movement of the pistons. [1] The benefit of this approach, versus a conventional crankshaft -and- connecting-rod mechanism, is that the kinematics of the piston motion can be optimized with ...

  8. Tesla turbine - Wikipedia

    en.wikipedia.org/wiki/Tesla_turbine

    Tesla turbine at Nikola Tesla Museum. The Tesla turbine is a bladeless centripetal flow turbine invented by Nikola Tesla in 1913. [1] It functions as nozzles apply a moving fluid to the edges of a set of discs.

  9. Euler's Disk - Wikipedia

    en.wikipedia.org/wiki/Euler's_Disk

    Euler's Disks appear in the 2006 film Snow Cake and in the TV show The Big Bang Theory, season 10, episode 16, which aired February 16, 2017. The sound team for the 2001 film Pearl Harbor used a spinning Euler's Disk as a sound effect for torpedoes. A short clip of the sound team playing with Euler's Disk was played during the Academy Awards ...

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