File:04. Галилеево топче.ogv

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Original file ‎(Ogg multiplexed audio/video file, Theora/Vorbis, length 47 s, 1,920 × 1,080 pixels, 4.61 Mbps overall, file size: 26 MB)

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Македонски: Опит со Галилеево топче кој го демонстрира пливањето, лебдењето и тонењето на едно тело од густината на флуидот во кој тоа е потопено. Експериментот ја покажува зависноста на големината на потисната сила (Архимедовата сила) од густината на течноста. Во вода, топчето плива, затоа што густината на водата е поголема од густината на материјалот од кој е направено топчето. Со додавање етанол (алкохол) во водата, се намалува густината на течноста до моментот кога нејзината густина не се изедначи со онаа на телото и тогаш телото лебди. Изведено и објаснето од проф. Оливер Зајков. Институт за физика на Природно-математичкиот факултет во Скопје.
English: The Galileo's Ball experiment, showing how buoyancy depends on the density of the fluid. The water has greater density than the ball and the ball floats. When adding ethanol (alcohol) the density of the fluid decreases until the densities of the water and ball become equal and the weight of the ball balances with the buoyancy. This is called neutral buoyancy. Performed and explained by Prof. Oliver Zajkov at the Physics Institute at the Ss. Cyril and Methodius University of Skopje, Macedonia.
Français : Expérience de la balle de Galilée.
L'expérience montre comment la flottabilité dépend de la masse volumique du fluide concerné. Ainsi, l'eau ayant une masse volumique plus grande que celle de la balle, celle-ci flotte dans ce liquide. Au fur et à mesure que l'éthanol, moins dense, est ajouté, la masse volumique du mélange diminue peu à peu et la balle flotte de moins en moins, jusqu'à ce que les masses volumiques soient équivalentes, ce qui amène la balle entre deux eaux.
Expérience réalisée et expliquée par le professeur Oliver Zajkov de l'Institut de physique de l'université Saints-Cyrille-et-Méthode de Skopje de Macédoine.
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Author Andrejdam

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current18:15, 30 December 201547 s, 1,920 × 1,080 (26 MB)Andrejdam (talk | contribs)User created page with UploadWizard

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VP9 1080P 1.32 Mbps Completed 23:32, 1 August 2018 2 min 15 s
Streaming 1080p (VP9) 2.7 Mbps Completed 19:23, 13 November 2023 1 min 13 s
VP9 720P 649 kbps Completed 23:31, 1 August 2018 1 min 14 s
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Streaming 240p (VP9) 133 kbps Completed 19:21, 13 November 2023 20 s
WebM 360P 565 kbps Completed 00:47, 12 February 2017 1 min 15 s
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Stereo (Opus) 81 kbps Completed 04:09, 9 November 2023 2.0 s
Stereo (MP3) 128 kbps Completed 07:36, 27 October 2023 2.0 s

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