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  2. Seconds pendulum - Wikipedia

    en.wikipedia.org/wiki/Seconds_pendulum

    A seconds pendulum is a pendulum whose period is precisely two seconds; one second for a swing in one direction and one second for the return swing, a frequency of 0.5 Hz. [ 1 ] Pendulum

  3. Pendulum (mechanics) - Wikipedia

    en.wikipedia.org/wiki/Pendulum_(mechanics)

    A pendulum is a body suspended from a fixed support such that it freely swings back and forth under the influence of gravity. When a pendulum is displaced sideways from its resting, equilibrium position, it is subject to a restoring force due to gravity that will accelerate it back towards the equilibrium position.

  4. Pendulum - Wikipedia

    en.wikipedia.org/wiki/Pendulum

    "Simple gravity pendulum" model assumes no friction or air resistance. A pendulum is a device made of a weight suspended from a pivot so that it can swing freely. [1] When a pendulum is displaced sideways from its resting, equilibrium position, it is subject to a restoring force due to gravity that will accelerate it back toward the equilibrium position.

  5. Double pendulum - Wikipedia

    en.wikipedia.org/wiki/Double_pendulum

    A double pendulum consists of two pendulums attached end to end.. In physics and mathematics, in the area of dynamical systems, a double pendulum, also known as a chaotic pendulum, is a pendulum with another pendulum attached to its end, forming a simple physical system that exhibits rich dynamic behavior with a strong sensitivity to initial conditions. [1]

  6. Generalized coordinates - Wikipedia

    en.wikipedia.org/wiki/Generalized_coordinates

    An example of a generalized coordinate would be to describe the position of a pendulum using the angle of the pendulum relative to vertical, rather than by the x and y position of the pendulum. Although there may be many possible choices for generalized coordinates for a physical system, they are generally selected to simplify calculations ...

  7. Second, how severe is the illness? If someone is experiencing very concerning symptoms, like chest pain, trouble breathing, numbness or weakness in an arm or leg, they should go to the emergency ...

  8. 11-Year-Old's Brain Tumor Discovered After Roller Coaster ...

    www.aol.com/11-olds-brain-tumor-discovered...

    A mom is alleging that a roller coaster “dislodged” a then-undetected malignant tumor in her daughter’s brain, giving the 11-year-old symptoms that eventually alerted the family to her ...

  9. Gridiron pendulum - Wikipedia

    en.wikipedia.org/wiki/Gridiron_pendulum

    The period of the pendulum's swing depends on its length, so a pendulum clock's rate varied with changes in ambient temperature, causing inaccurate timekeeping. The gridiron pendulum consists of alternating parallel rods of two metals with different thermal expansion coefficients, such as steel and brass. The rods are connected by a frame in ...