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Breaking the sound barrier with a rock - you've done it!
21 Aug 2013 10:22 #1
by ScienceChic
"Now, more than ever, the illusions of division threaten our very existence. We all know the truth: more connects us than separates us. But in times of crisis the wise build bridges, while the foolish build barriers. We must find a way to look after one another as if we were one single tribe.” -King T'Challa, Black Panther
The truth is incontrovertible. Malice may attack it. ignorance may deride it, but in the end, there it is. ~Winston Churchill
If you've ever sat and tossed rocks into a pond or lake, you've caused the sound barrier to be broken. Cool, huh?! 
(or as a scientist would say, you've created "Supersonic Air Flow due to Solid-Liquid Impact") 
Splashing stones drive supersonic flow
Hamish Johnston
Jan 22, 2010
(or as a scientist would say, you've created "Supersonic Air Flow due to Solid-Liquid Impact") Splashing stones drive supersonic flow
Hamish Johnston
Jan 22, 2010
There is something satisfying about the plonk and splash of a stone falling through the smooth surface of a pond. But now this seemingly ordinary, albeit pleasing, phenomenon appears to be anything but mundane.
When a stone plunges into water, a cylindrical sheet of water called the "crown splash" is sent up into the air. As the stone begins to sink, it pulls a cylindrical cavity of air down with it. The surrounding water then pinches middle of the cavity to create an hourglass shape. The cavity begins to collapse and the upward rush of air causes the spectacular finale – a jet of water that shoots high up above the surface of the pond.
Detlef Lohse and colleagues at the University of Twente and the University of Valencia have now shown that this final rush of air moves faster than the speed of sound.
"Now, more than ever, the illusions of division threaten our very existence. We all know the truth: more connects us than separates us. But in times of crisis the wise build bridges, while the foolish build barriers. We must find a way to look after one another as if we were one single tribe.” -King T'Challa, Black Panther
The truth is incontrovertible. Malice may attack it. ignorance may deride it, but in the end, there it is. ~Winston Churchill
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22 Aug 2013 14:27 #3
by ScienceChic
"Now, more than ever, the illusions of division threaten our very existence. We all know the truth: more connects us than separates us. But in times of crisis the wise build bridges, while the foolish build barriers. We must find a way to look after one another as if we were one single tribe.” -King T'Challa, Black Panther
The truth is incontrovertible. Malice may attack it. ignorance may deride it, but in the end, there it is. ~Winston Churchill
Replied by ScienceChic on topic Breaking the sound barrier with a rock - you've done it!
Too small - it's only a "plonk"
"Now, more than ever, the illusions of division threaten our very existence. We all know the truth: more connects us than separates us. But in times of crisis the wise build bridges, while the foolish build barriers. We must find a way to look after one another as if we were one single tribe.” -King T'Challa, Black Panther
The truth is incontrovertible. Malice may attack it. ignorance may deride it, but in the end, there it is. ~Winston Churchill
Please Log in or Create an account to join the conversation.
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