An oscillating pendulum, with velocity and acceleration marked. It experiences both tangential and centripetal acceleration.
Relevant and lovely. I could stare for hours; if only to avoid doing ACTUAL Vibrations & Waves work…
(via understandingtheuniverse)
Every day in Vibrations&Waves/Electricity&Magnetism. (save for brief moments of “OOH I KNOW WHAT THAT IS,” of course)
(Source: onlyscreencaps, via creature-0f-a-brief-season)
Tussin (it’s a thing), First Doctor (“The Daleks”) and two Intermediate Theoretical homeworks to knock out. Inverse Laplace Transforms and Fourier Transforms all day, urry day.
Guh. I really should have come up with problems to ask my Differential Equations prof this morning.
Alas, it’s in the past and I can’t cross into (much less interact with) my own timestream, so onward and upward!
Yay, higher learning!
Last of the Feynman series for now, absolute genius.
“If it disagrees with experiment, it’s wrong; in that simple statement, is the key to science. It doesn’t make a difference how beautiful your guess is, how smart you are, who made the guess, what his name is, it doesn’t matter; it’s wrong.”
(via understandingtheuniverse)
During a panel discussion at the SETIcon II conference in Santa Clara, Calif., over the weekend, scientists discussed the Big Bang and whether there was a requirement for some divine power to kick-start the Universe 13.75 billion years ago.
Unsurprisingly, the resounding answer was: No.
“The Big Bang could’ve occurred as a result of just the laws of physics being there,” said astrophysicist Alex Filippenko of the University of California, Berkeley. “With the laws of physics, you can get universes.”
Yeah, buddy! Physics doin’ work!
Rotating a fluid often produces different dynamical behavior than for a non-rotating fluid. Here this concept is demonstrated by dropping creamer into a tank of water. Both experiments produce a turbulent plume, but the way the plume spreads and diffuses is much different in the case of the rotating tank, thanks to the Coriolis effect. (Video credit: SPINLab UCLA)
Something I’ve pondered for far too many times in far too many diners (typically, at far too late of an hour.)
”(In Fundamental Physics), we’re always trying to investigate those things, in which we don’t understand the conclusions.
We’re not trying to all of the time, to check our conclusions. After we’ve checked them enough, we’re okay.
The thing that doesn’t fit is the the thing that’s most interesting. The part that doesn’t go according to what you expected.”
In this age of specialization, men who thoroughly know one field are often incompetent to discuss another. The great problems of the relations between one and another aspect of human activity have for this reason been discussed less and less in public.
When we look at the past great debates on these subjects we feel jealous of those times, for we should have liked the excitement of such argument. The old problems, such as the relation of science and religion, are still with us, and I believe present as difficult dilemmas as ever, but they are not often publicly discussed because of the limitations of specialization.
"— Richard P. Feynman
(Source: en.wikiquote.org)
Penguins, already fluid dynamicists by nature, have developed clever methods of increasing their speed to escape from the leopard seals that prey on them. In the clip above, notice from 1:55 onward as the penguins swim for the surface and leap onto the ice - they leave a trail of bubbles in their wake. The penguins are using supercavitation to decrease their drag. When the penguins first dive in to the water, they splay their feathers out in the air and then lock them closed in the water, trapping pockets of air beneath them. When the need for a burst of speed arises, the penguin shifts its feathers to release the air, coating most of its body in a layer of bubbles. Because the drag in air is much less than the drag in water, this enables the bird to achieve much higher speeds than they normally do when swimming.
Penguins are awesome!
(Source: dvice.com)
