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Archimedes' Principle01:13

Archimedes' Principle

Archimedes' principle states that an upward buoyant force exerted on a body that is immersed partially or entirely in a fluid is equal to the weight of the fluid displaced by it. To understand how much buoyant force is needed to make an object float, let us think about what happens when a submerged object is removed from a fluid. If the object were not in the fluid, the space occupied by the object would be filled by the fluid having a weight wfl. This weight is supported by the surrounding...
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Updated: Jul 11, 2026

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1981N1: 海王星のアーチか

W B Hubbard

    Science (New York, N.Y.)
    |March 14, 1986
    PubMed
    まとめ
    この要約は機械生成です。

    1981年の海王星上の物体は,当初は衛星と考えられていたが,おそらく惑星の弧であった. アリゾナ州フラグスタフでの同時観測は,衛星を排除し,弧形幾何学を制約した.

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    科学分野:

    • 惑星科学は惑星科学である.
    • 天文学 天文学
    • ネプテュンのシステムダイナミクス

    背景:

    • 1981年,海王星近くの天体が恒星遮蔽によって検出され,当初は新しい衛星として特定されました.
    • その後の再解釈では,この物体は1984年に観測されたものと同様の海王星の弧であったかもしれないと示唆された.

    研究 の 目的:

    • 1981年の海王星天体の性質を再評価する.
    • 潜在的な海王星の衛星と惑星の弧を区別するために.
    • ネプテュンの弧の可能な幾何学を制限するために.

    主な方法:

    • 1981年の恒星遮蔽の同時測定の分析.
    • アリゾナ州ツーソンとアリゾナ州フラグスタフの観測を比較する.
    • 弧形構成の可行性を評価するための幾何学モデリング.

    主要な成果:

    • 1981年の物体は,アリゾナ州フラグスタフで同時に観測した際,星を遮らなかった.
    • このゼロの結果は,この物体が海王星の衛星であるとの解釈に矛盾する.
    • この発見は,海王星の弧の可能な形状と方向性を著しく制限しています.

    結論:

    • 1981年の海王星オブジェクトは,衛星である可能性は低い.
    • データは,その物体が海王星の弧であったという仮説を裏付けている.
    • この研究は,海王星の弧現象を理解するための重要な観測的制約を提供します.