Referenzen
- Vorführexperimente, Videos
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Cumulative Cannon
very similar task at International Physicists' Tournament (IPT) 2020
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International Physicists' Tournament 2020 Final Live Stream!
very similar task at International Physicists' Tournament (IPT) 2020
https://www.youtube.com/live/5m0uE7veJZ0?feature=shared&t=13093
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IPT 2020 Online edition: PF2, Cumulative cannon, Colombia vs Russia
very similar task at International Physicists' Tournament (IPT) 2020
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IPT 2020 Online edition: PF3, Cumulative Cannon, USA vs India
very similar task at International Physicists' Tournament (IPT) 2020
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Ping Pong Blast off (Cumulative Cannon) explained in Full detail
Ping Pong Blast off (Cumulative Cannon) explained for parents and teachers by IPT 2020 participants
- Wissenschaftliche Artikel
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Effects of a water hammer and cavitation on jet formation in a test tube
They investigate the motion of a gas–liquid interface in a test tube induced by a large acceleration via impulsive force. They conduct simple experiments in which the tube partially filled with a liquid falls under gravity and hits a rigid floor.
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Short-term dynamics of a density interface following an impact
A tube filled with a perfectly wetting liquid falls axially under its own weight. In its gravity-free reference frame, the liquid interface is deformed by surface tension into a hemispherical shape. On impact of the tube on a rigid floor, the interface curvature reverses violently, forming a concentrated jet.
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Suction-ejection of a ping-pong ball in a falling water-filled cup
During free fall, the absence of gravity in the reference frame of the cup makes capillary forces dominant, causing the ball to be sucked into water. At impact, the high velocity ejection is due to the strong Archimedes’ force caused by vertical acceleration. In this paper, the authors study the dynamics of the capillary sinking of the ball during free fall and the ejection speed at impact, using tracking and high-speed imaging. In particular, they show that at short-time, the sinking is governed by capillary and added mass forces.
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The ping-pong ball water cannon
The authors report an initial dimensional and order-of-magnitude analysis, and describe the successive experimental set-ups. The proposed explanation is confirmed by direct high-speed video observations. These videos are downloadable, too.
- Online-Ressourcen
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IPT2020-Problem 1-Cumulative cannon (University of Campinas, Brazil)
Slides of one presentation for very similar task at International Physicists' Tournament (IPT) 2020