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Posts Tagged ‘throwing stones

Sinking like a stone– that’s to say, complicatedly…


From our friends at Slashdot:

Researchers in Spain and the Netherlands add another piece to a centuries-old puzzle in physics: the dynamics of an object falling into water. This common occurrence has a complex anatomy that includes a thin ‘crown splash’ around the perimeter of the impact, a deep cavity of air following the impactor, and a high, narrow jet of water that results from the collapse of the cavity. The new research, recently published in Physical Review Letters, demonstrates that airflow through the neck of the collapsing cavity reaches supersonic speeds despite low relative pressures between the air in the cavity and ambient pressure. Such an effect has no analogue in aerospace engineering or other sciences because of the highly dynamic nature of the collapsing nozzle structure.

Note the all-too-current example of confusion in media business models:  PRL (second link above) charges $25 to download what can be had on arXiv (first link) gratis…

As we reach for just the right flat smooth one, we might pause to offer birthday wishes to one who was not unacquainted himself with large bodies of water:  poet, iconic bad boy (and, as readers will recall,  father of the redoubtable Ada Lovelace) George Gordon, Lord Byron; he was was born on this date in 1788.  Byron once famously suggested that “If I don’t write to empty my mind, I go mad.”  Still, history suggests, even then…

George Gordon Byron, 6th Baron Byron

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