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Work and Power for Rotational Motion01:27

Work and Power for Rotational Motion

Work and power in rotational motion are completely analogous to work and power in translational motion. The total work done to rotate a rigid body through an angle 'θ' about a fixed axis is the sum of the torques integrated over the angular displacement. Hence, torque and angular displacement in rotational motion are analogous to force and linear displacement in translational motion, respectively.
Similarly, the power delivered to a system that is rotating about a fixed axis is given by the...
Gyroscope: Precession01:24

Gyroscope: Precession

Precession can be demonstrated effectively through a spinning top. If a spinning top is placed on a flat surface near the surface of the Earth at a vertical angle and is not spinning, it will fall over due to the force of gravity producing a torque acting on its center of mass. However, if the top is spinning on its axis, it precesses about the vertical direction, rather than topple over due to this torque. Precessional motion is a combination of a steady circular motion of the axis and the...
Acceleration due to Gravity on Earth01:21

Acceleration due to Gravity on Earth

According to Newton's law of gravitation, the gravitational force on a body is proportional to its mass. According to Newton's second law of motion, the acceleration produced by an external force is inversely proportional to the force. Hence, the acceleration of an object under an external force of gravitation is independent of its mass.
The acceleration of an object close to the Earth, because of the Earth's gravitational pull, is called the acceleration due to gravity. It is always directed...
Apparent Weight and the Earth's Rotation01:28

Apparent Weight and the Earth's Rotation

Since all objects on the Earth's surface move through a circle every 24 hours, there must be a net centripetal force on each object, directed towards the center of that circle. The points of the north and south poles are the only exception to this rule.
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Coriolis Force01:23

Coriolis Force

An accelerating particle experiences a force equal to the mass multiplied by the acceleration in an inertial frame of reference. Consider a particle in a non-inertial frame of reference, such as a sliding ball on a rotating table. The acceleration of the ball in this rotating reference frame is different than in the intertial frame, which modifies its equation of motion. The fictitious forces acting additionally on a rotating frame of reference alter Newton's Second Law expression. Centripetal...
Acceleration due to Gravity on Earth00:55

Acceleration due to Gravity on Earth

Newton's second law is closely related to his first law of motion. It mathematically gives the cause-and-effect relationship between force and changes in motion. Newton's second law is quantitative and is used extensively to calculate what happens in situations involving a force. All external forces acting on a system add together to produce a net force Fnet. A larger net external force produces a larger acceleration. This acceleration is directly proportional to, and in the same direction as,...

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Video Experimental Relacionado

Updated: Jul 11, 2026

Sediment Core Extrusion Method at Millimeter Resolution Using a Calibrated, Threaded-rod
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Published on: August 17, 2016

Dinámica de rotación del núcleo y eventos geológicos.

Greff-Lefftz1, Legros

  • 1Department of Geomagnetism and Paleomagnetism, Institut de Physique du Globe de Paris, 4 place Jussieu, 75252 Paris 05, France. Ecole et Observatoire des Sciences de la Terre, 5 rue R. Descartes, 67084 Strasbourg, France.

Science (New York, N.Y.)
|November 27, 1999
PubMed
Resumen

El núcleo fluido de la Tierra y las mareas solares resonaron en el pasado, lo que podría explicar la formación de la corteza continental y los cambios en las inversiones del campo magnético de la Tierra.

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Last Updated: Jul 11, 2026

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Sediment Core Extrusion Method at Millimeter Resolution Using a Calibrated, Threaded-rod

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Área de la Ciencia:

  • La geofísica es la geofísica.
  • Ciencias de la Tierra Ciencias de la Tierra Ciencias de la Tierra
  • Ciencias planetarias Ciencias planetarias.

Sus antecedentes:

  • La dinámica del núcleo fluido de la Tierra está influenciada por las fuerzas de marea lunar-solar.
  • La rotación axial de la Tierra experimenta una desaceleración secular debido a las fuerzas de las mareas.

Objetivo del estudio:

  • Para investigar las implicaciones de la resonancia entre la propia frecuencia de rotación del núcleo fluido de la Tierra y las mareas solares.
  • Explorar el vínculo entre las fuerzas de las mareas, la dinámica central y los fenómenos geológicos/geofísicos.

Principales métodos:

  • Análisis de las oscilaciones del núcleo del fluido inducidas por las fuerzas de marea.
  • Examen de la desaceleración secular de las mareas de la rotación axial de la Tierra.
  • Modelado de la fuerza de fricción viscomagnética en los límites del núcleo.

Principales resultados:

  • Los eventos de resonancia ocurrieron hace alrededor de 3,0 x 10^9, 1,8 x 10^9 y 3 x 10^8 años.
  • La fricción viscomagnética en los límites del núcleo genera calor, desestabilizando la capa térmica D".
  • Las perturbaciones en el proceso de dinamo del núcleo son causadas por el aumento de las temperaturas en los límites del núcleo del fluido.

Conclusiones:

  • El calentamiento inducido por resonancia puede desencadenar la generación de plumas de manto profundo.
  • Estos fenómenos podrían explicar la formación de la corteza continental a gran escala y los eventos de inundación de basalto.
  • Los cambios bruscos en la frecuencia de inversión geomagnética pueden estar vinculados a estos procesos centrales.