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  2. Ladder paradox - Wikipedia

    en.wikipedia.org/wiki/Ladder_paradox

    The diagram on the left illustrates a bar and a ring in the rest frame of the ring at the instant that their centers coincide. The bar is Lorentz-contracted and moving upward and to the right while the ring is stationary and uncontracted. The diagram on the right illustrates the situation at the same instant, but in the rest frame of the bar.

  3. Gravitational time dilation - Wikipedia

    en.wikipedia.org/wiki/Gravitational_time_dilation

    Additionally, time dilations due to height differences of less than one metre have been experimentally verified in the laboratory. [14] Gravitational time dilation in the form of gravitational redshift has also been confirmed by the Pound–Rebka experiment and observations of the spectra of the white dwarf Sirius B.

  4. Equations for a falling body - Wikipedia

    en.wikipedia.org/wiki/Equations_for_a_falling_body

    A set of equations describing the trajectories of objects subject to a constant gravitational force under normal Earth-bound conditions.Assuming constant acceleration g due to Earth's gravity, Newton's law of universal gravitation simplifies to F = mg, where F is the force exerted on a mass m by the Earth's gravitational field of strength g.

  5. Brachistochrone curve - Wikipedia

    en.wikipedia.org/wiki/Brachistochrone_curve

    The curve of fastest descent is not a straight or polygonal line (blue) but a cycloid (red).. In physics and mathematics, a brachistochrone curve (from Ancient Greek βράχιστος χρόνος (brákhistos khrónos) 'shortest time'), [1] or curve of fastest descent, is the one lying on the plane between a point A and a lower point B, where B is not directly below A, on which a bead slides ...

  6. Hafele–Keating experiment - Wikipedia

    en.wikipedia.org/wiki/Hafele–Keating_experiment

    Hafele and Keating obtained $8000 in funding from the Office of Naval Research [12] for one of the most inexpensive tests ever conducted of general relativity. Of this amount, $7600 was spent on the eight round-the-world plane tickets, [13] including two seats on each flight for "Mr. Clock." They flew eastward around the world, ran the clocks ...

  7. Twin paradox - Wikipedia

    en.wikipedia.org/wiki/Twin_paradox

    This is a different voyage than the one shown above, as both schemes take the same assumed total point-of-view time: T=12 (stay-at-home), resp τ=12 (ship), so the results of the calculated other-one's times must be different: τ=9.33 (ship), resp T=17.3 (stay at home). In the standard proper time formula

  8. Here’s Exactly How to Do 5 Different Types of Deadlifts - AOL

    www.aol.com/lifestyle/exactly-5-different-types...

    Hinge hips back with a straight back and neutral spine, this time only lowering the weights about halfway to the floor. Hover there for 2 to 8 seconds. Squeeze the glutes to return to a starting ...

  9. Equivalence principle - Wikipedia

    en.wikipedia.org/wiki/Equivalence_principle

    The strong equivalence principle can be tested by 1) finding orbital variations in massive bodies (Sun-Earth-Moon), 2) variations in the gravitational constant (G) depending on nearby sources of gravity or on motion, or 3) searching for a variation of Newton's gravitational constant over the life of the universe [14]: 47