関連する実験動画

Updated: Jul 10, 2026

Measuring Carbon-based Contaminant Mineralization Using Combined CO2 Flux and Radiocarbon Analyses
11:19

Measuring Carbon-based Contaminant Mineralization Using Combined CO2 Flux and Radiocarbon Analyses

Published on: October 21, 2016

ワシントン州とオレゴン州近くの大陸棚の堆積物移動

M G Gross, J L Nelson

    Science (New York, N.Y.)
    |November 18, 1966
    PubMed
    まとめ

    コロンビア川の亜鉛-65とコバルト-60を含む放射性沈殿物は,大陸棚に沿って北に移動し,海岸から西に移動します. この動きは,これらの核酸の濃度と活性比の変化によって示される.

    さらに関連する動画

    Methods of Soil Resampling to Monitor Changes in the Chemical Concentrations of Forest Soils09:16

    Methods of Soil Resampling to Monitor Changes in the Chemical Concentrations of Forest Soils

    Published on: November 25, 2016

    Deployment and Retrieval of Mineral Samplers05:52

    Deployment and Retrieval of Mineral Samplers

    Published on: January 20, 2026

    関連する概念動画

    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...
    Acceleration due to Gravity on Other Planets01:24

    Acceleration due to Gravity on Other Planets

    The gravitational acceleration of an object near the Earth's surface is called the acceleration due to gravity. It can be measured by conducting simple experiments on Earth. However, such an experiment is impossible to conduct on the surface of other planets.
    Astronomical observations are thus used to measure the acceleration due to gravity on other planets. This can be determined by observing the effect of a planet's gravity on objects close to it. The crucial factor that helps in this...
    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.
    For an object on the Earth's equator, the net centripetal force that accounts for its rotation is the Earth's pull towards its center, or the weight minus the normal force that prevents it from piercing into the Earth's surface. This force,...
    Variation in Acceleration due to Gravity near the Earth's Surface01:20

    Variation in Acceleration due to Gravity near the Earth's Surface

    An object's apparent weight is its weight measured by a spring balance at its location. It is different from its true weight, the force with which the Earth pulls it, because of the Earth's rotation. Mathematically, an object's apparent weight equals its true weight minus the centripetal force that keeps it in a circular motion along with the Earth's surface every 24 hours.
    The difference between the true and apparent weights is proportional to the square of the Earth's angular speed. Since the...
    The Principle of Superposition and the Gravitational Field01:17

    The Principle of Superposition and the Gravitational Field

    The principle of superposition applies to gravitational forces of objects that are sufficiently far apart. It states that the net gravitational force on a point object is the vector sum of the gravitational forces on it due to various objects. The principle helps calculate the force by listing the individual forces and then vectorially summing them up. However, it should be noted that the principle of superposition is not always apparent. In the presence of a second force, the first force could...
    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,...