Fluid Dynamical Behaviors Are Often The Result Of Competing Forces. Here Paint Flung From A Spinning

Fluid dynamical behaviors are often the result of competing forces. Here paint flung from a spinning rod illustrates the effects of adhesion, surface tension, and centrifugal force. In general, surface tension tries to hold a fluid together, and adhesion allows it to stay attached to a surface. Centrifugal force, on the other hand, tends to push the fluid outward. As the spinning rod accelerates, centrifugal force wins over adhesion and the paint spirals outward. For awhile, surface tension manages to hold the paint together, stretching it into spiraling ligaments of fluid. But when centrifugal force overpowers surface tension as well, the ligaments of paint snap into smaller droplets, still flying outward. Check out the full video for more great slow motion shots, and be sure to look at photographer Fabian Oefner’s “Black Hole“ series, which inspired the video. (Image credit: BBC Earth Unplugged, source video)

Suicide, a Crime of Loneliness

Andrew Solomon on Robin Williams:

“He played an alien so well because he was an alien in his own mind, permanently auditioning to be one of us. Suicide is a crime of loneliness, and adulated people can be frighteningly alone. Intelligence does not help in these circumstances; brilliance is almost always profoundly isolating.”

Above: Robin Williams, September 14, 1978. Photograph by Jim Britt/Getty

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nisiablog

10 years ago

Greatest minds in physics playing poker

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nisiablog

9 years ago

SubmissionFriday:

Giles Clarke

‘The Recyclers of Port-Au-Prince’ is an image that is emblematic of man’s current struggle in dealing with the hundreds of millions of tons of waste created annually. The men in the image live in the vast un-regulated waste dump on the outskirts of Haiti’s capital, Port-Au-Prince. Thousands of these ’re-cyclers’ pick through everything from discarded electronic goods to disease-ridden medical waste. On a good day, these men will earn $12-15 a day collecting then re-selling plastics, aluminum and other recyclable products. Many of the dump inhabitants live in crude tin shacks that line the smokey landscape.

(photograph taken in Port-Au-Prince, Haiti. Jan2015)

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nisiablog

10 years ago

The brain is full of Manhattan-like grids

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nisiablog

10 years ago

(via https://www.youtube.com/watch?v=ptqoSZgh7q8)

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nisiablog

10 years ago