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Videos de Conceptos Relacionados

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Energy Budgets and Reproductive Strategies

Organisms must balance energy intake with the energy required for growth, maintenance, and reproduction. These trade-offs result in a variety of survivorship and reproductive strategies, including semelparity and iteroparity. Semelparous species reproduce only once in their lifetime, often investing most available resources into that single reproductive event. Iteroparous species, by contrast, reproduce multiple times over their lifetimes, typically allocating fewer resources to any single...
Energy00:58

Energy

The universe is composed of matter in different forms, and all forms of matter contain energy.  The different forms of energy on Earth originate from the Sun—the ultimate energy source. For instance, plants capture light energy from the Sun, and through the process of photosynthesis, convert it into chemical energy. This stored energy from plants can be harnessed in many ways. For example, eating plant products as food provides energy for our body to function, and burning wood or coal...
Work-energy Theorem01:41

Work-energy Theorem

According to Newton’s second law of motion, the sum of all the forces acting on a particle (net force) determines the rate of change in the momentum of the particle (motion). Therefore, we should consider the work done by all forces acting on a particle, or the net work, to see its effect on the particle’s motion.
The work-energy theorem equates work done by all the forces on an object to the change in its kinetic energy. The theorem can be used to calculate work done by a force when...
Energy Diagrams - I01:14

Energy Diagrams - I

The dynamics of a mechanical system can be easily understood by interpreting a potential energy diagram. Since energy is a scalar quantity, the interpretation of the dynamics of the system becomes even simpler.
Take the example of a skater on a parabolic ramp. The potential energy at different points along the ramp will be proportional to the height of the ramp, which varies quadratically with the horizontal position on the ramp. As the skater moves down the ramp from the highest position,...
Energy Diagrams - II01:10

Energy Diagrams - II

Energy diagrams are important to understand the dynamics of a system. The topology of an energy diagram helps illustrate the equilibrium points of the system.
The point in the energy diagram at which the system’s potential energy is the lowest is known as the local minima. The system tends to stay in this position indefinitely unless acted upon by a net force. The slope of the potential energy diagram at the local minima is zero, indicating that zero net force is acting on the system. The slope...
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Potential-Energy Criterion for Equilibrium

Potential energy or potential function plays an essential role in determining the stability of a mechanical system. If a system is subjected to both gravitational and elastic forces, the potential function of the system can be expressed as the algebraic sum of gravitational and elastic potential energy. If the system is in equilibrium and is displaced by a small amount, then the work done on the system equals the negative of the change in the system's potential energy from the initial to the...

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Video Experimental Relacionado

Updated: Jul 11, 2026

Determining the Contribution of the Energy Systems During Exercise
11:15

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Published on: March 20, 2012

Energía incorporada y valoración económica.

R Costanza

    Science (New York, N.Y.)
    |December 12, 1980
    PubMed
    Resumen

    Este estudio reevalúa los cálculos de energía incorporada al incluir energía para el trabajo y los servicios gubernamentales. La inclusión de estos factores revela un fuerte vínculo entre la energía incorporada de un producto y su valor en dólares en la economía estadounidense.

    Área de la Ciencia:

    • Economía del medio ambiente La economía del medio ambiente.
    • Análisis Energético Análisis Energético
    • Economía de insumos y resultados Economía de insumos y resultados.

    Sus antecedentes:

    • La energía incorporada cuantifica la energía total para producir bienes y servicios.
    • Los cálculos tradicionales a menudo excluyen los insumos de energía para la mano de obra y los servicios gubernamentales.
    • Esta exclusión se deriva de la suposición de factores de producción económicos independientes (tierra, trabajo, capital).

    Objetivo del estudio:

    • Investigar el impacto de incluir la energía para el trabajo y los servicios gubernamentales en los cálculos de energía incorporada.
    • Determinar si la inclusión de estos insumos energéticos previamente omitidos fortalece la relación entre la energía incorporada y el valor económico.

    Principales métodos:

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    • Análisis de entrada-salida adaptado para incorporar los requisitos energéticos para los servicios laborales y gubernamentales.
    • Calculó las energías incorporadas para una economía estadounidense de 92 sectores utilizando la metodología revisada.

    Principales resultados:

    • La inclusión de energía para la mano de obra y los servicios gubernamentales impacta significativamente los cálculos de energía incorporada.
    • Se observó una fuerte correlación entre la energía incorporada y el valor en dólares cuando se incluyeron estos factores.
    • Se destaca la interdependencia de los factores económicos de producción, en particular el papel de la energía.

    Conclusiones:

    • Las evaluaciones de energía incorporada estándar pueden subestimar el consumo total de energía al omitir la energía de los servicios laborales y gubernamentales.
    • Los factores económicos de producción no son independientes, y la energía es parte integral de su creación.
    • Los cálculos de energía incorporada revisados proporcionan una representación más precisa del valor económico y la intensidad energética.