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Eccentricity of an Ellipse01:27

Eccentricity of an Ellipse

An ellipse is a fundamental conic section defined by the constant sum of distances from any point on its curve to two fixed points, known as the foci. This geometric property can be physically demonstrated using a pencil, string, and two pins. By anchoring the string at both ends and maintaining it taut with a pencil, one can trace the outline of an ellipse.The shape and extent of the ellipse are determined by its eccentricity, e, defined as the ratio of the distance between the center and a...
Periodic Classification of the Elements04:00

Periodic Classification of the Elements

The periodic table arranges atoms based on increasing atomic number so that elements with the same chemical properties recur periodically. When their electron configurations are added to the table, a periodic recurrence of similar electron configurations in the outer shells of these elements is observed. Because they are in the outer shells of an atom, valence electrons play the most important role in chemical reactions. The outer electrons have the highest energy of the electrons in an atom...
Momentum And Radiation Pressure01:20

Momentum And Radiation Pressure

An object absorbing an electromagnetic wave would experience a force in the direction of propagation of the wave. This force occurs because electromagnetic waves contain and transport momentum. The force accounts for the wave's radiation pressure exerted on the object. Maxwell's prediction was confirmed in 1903 by Nichols and Hull by precisely measuring radiation pressures with a torsion balance. The measuring instrument had mirrors suspended from a fiber kept inside a glass container. Nichols...
Unusual Results01:16

Unusual Results

Unusual results are those that have a very low chance of occurring. Unusual results can be identified using probabilities and the range rule of thumb. In problems involving probability, unusual results can be observed in 2 instances – an unusually high number of successes or an unusually low number of successes.
According to the range rule of thumb, any value above or below two standard deviations, 2σ  from the mean, μ  is considered unusual.
Maximum unusual value = μ + 2σ
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Atomic Nuclei: Larmor Precession Frequency01:11

Atomic Nuclei: Larmor Precession Frequency

The earth's gravitational field produces a 'twisting force' perpendicular to the angular momentum of a spinning mass (such as a spinning top) that causes the mass to 'wobble' around the gravitational field axis in a phenomenon called precession. Similarly, the magnetic moment (μ) of a spinning nucleus precesses due to an external magnetic field directed along the z-axis. The precession of the magnetic moment vector about the magnetic field is called Larmor precession, and the angular frequency...
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Magnetic Moment of an Electron

Electrons revolving around a nucleus are analogous to a circular current carrying loop. This current produces a magnetic dipole moment proportional to the electron's orbital angular momentum. Since the orbital angular momentum is quantized in terms of the reduced Planck's constant, the dipole moment is quantized in the Bohr Magneton. The value of the Bohr magneton is 9.27 x 10-24 Am2. Electrons also have an intrinsic spin angular momentum, and the associated spin magnetic moment is...

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Updated: Jul 12, 2026

Scattering And Absorption of Light in Planetary Regoliths
11:34

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Published on: July 1, 2019

El extraño cometa periódico Machholz.

D W Green, H Rickman, A C Porter

    Science (New York, N.Y.)
    |March 2, 1990
    PubMed
    Resumen

    El cometa Machholz es único, se acerca al sol más cerca que cualquier planeta. Su órbita lo muestra.

    Área de la Ciencia:

    • La astronomía es la astronomía.
    • Ciencia de los Cometas Ciencia de los Cometas
    • La Dinámica Orbital es una Dinámica Orbital.

    Sus antecedentes:

    • El cometa periódico Machholz 1986 VIII (1986e) exhibe un perihelio excepcionalmente cercano.
    • Su período orbital es de 5,25 años, con una distancia decreciente al perihelio.
    • Esto lo convierte en un tema único para los estudios de evolución cometaria.

    Objetivo del estudio:

    • Para revisar las observaciones del cometa Machholz desde su descubrimiento.
    • Para investigar la evolución orbital del cometa durante 4000 años utilizando simulaciones numéricas.
    • Discutir las perspectivas para observar su paso al perihelio en 1991.

    Principales métodos:

    • Revisión de los datos de observación del descubrimiento de cometas.

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  • Simulaciones numéricas de la órbita del cometa durante un período prolongado (4000 años).

    • Principales resultados:

    • La distancia al perihelio del cometa Machholz ha disminuido significativamente desde el año 700 d.C.
    • Se espera que el cometa alcance una distancia de perihelio extremadamente pequeña (0.03 UA) en 2450.
    • Se predice que la órbita del cometa eventualmente conducirá a un aumento de las distancias del perihelio si sobrevive.

    Conclusiones:

    • El cometa Machholz ofrece una rara oportunidad para estudiar la evolución cometaria bajo extrema proximidad solar.
    • Los modelos numéricos predicen cambios significativos en su órbita durante milenios.
    • Otras observaciones son cruciales para comprender su supervivencia y comportamiento a largo plazo.