Slashdot Mirror
The Weird Science of Tossing Stones Into a Lake
Interoperable writes "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." It's funny that the APS wants to charge non-subscribers $25 to download what is available for free on the arXiv.
I guess most slashdot readers never read that story.
Until presently, I'd always assumed it was a requirement for membership.
Sadly, it has occurred to me just now, that story was indeed in book form
and therefore is likely no longer considered pertinent by trolls and the like.
There is nothing to FEAR but NOTHING itself; and I fear there is a whole lot of nothing going on. --scorpivs