#angular momentum

[n0rtist]

Mers Chrimbo Everyone!

[yesterdays-xkcd]

With reasonable assumptions about latitude and body shape, how much time might she gain them? Note: whatever the answer, sunrise always comes too soon. (Also, is it worth it if she throws up?)

Angular Momentum [Explained]

Transcript Under the Cut

[Cueball sits sideways on a bed under an open window in the corner of a room. He is looking at Megan, who is spinning fast, indicated with two large circles indicating where her arms that are spread far out rotate, as well as two smaller circles around her knees and feet. The bed sheets are clearly messed up, as if someone has used it for activities other than sleeping. It is night and dark gray outside the window, and inside the room everything is also gray but lighter. Behind the spoken text, the background is white, but fades to the darker gray at the edges. There is also different gray shading in different parts of the room.] Cueball: What are you doing? Megan: Spinning counterclockwise Megan: Each turn robs the planet of angular momentum Megan: Slowing its spin the tiniest bit Megan: Lengthening the night, pushing back the dawn Megan: Giving me a little more time here Megan: With you

[elkement]

Poinsot's Paper Spaceship

Work in progress!

The first two (of four) drawings in my new series: Intersection of ellipsoid and sphere, an an orthographic projection!

A tribute to French mathematician Louis Poinsot whose legacy is a geometric theory of the motion of rigid bodies.

[dragobot314]

Why Dinosaurs Would Make Good Ice Skaters

Why is this a question? I don’t remember the reason. Perhaps my brother-in-law mentioned dinosaurs and asked what they would have been good at, so I said, “Ice skating,” so that’s where we are. In the 21st century though some people live in the past. With the dinosaurs. Okay, okay, I’ll stop rambling and jump directly to the conclusion. It is not without the lack of a doubt that dinosaurs would…

[whats-in-a-sentence]

Move mass closer to something's spin axis and, if angular momentum is conserved, and will spin faster; move it farther out and things will slow down. It is an underappreciated side benefit of scientific progress that figure skating, originally developed on a frozen fen near Cambridge as a way of demonstrating this phenomenon, has gone on to become a very popular sport.*

* This is not true.

"The Moon: A History for the Future" - Oliver Morton

[chemistryphysicstuition]

Torque and Angular Momentum

In the fascinating world of physics, rotational motion takes center stage, offering a wealth of insights into the behaviour of objects as they spin and twirl around an axis. Two indispensable concepts in this realm are torque and angular momentum.

[peeterjoot]

New video: Elliptical motion from Newton's law of gravitation.

[Click here for a PDF version of this post]   We found previously that \begin{equation}\label{eqn:solarellipse:20} \mathbf{\hat{r}}’ = \inv{r} \mathbf{\hat{r}} \lr{ \mathbf{\hat{r}} \wedge \Bx’ }. \end{equation} Somewhat remarkably, we can use this identity to demonstrate that orbits governed gravitational force are elliptical (or parabolic, or hyperbolic.) This ends up being possible because…

[fuckyeahfluiddynamics]

Playful Martian Dust Devils

The Martian atmosphere lacks the density to support tornado storm systems, but vortices are nevertheless a frequent occurrence. As sun-warmed gases rise, neighboring air rushes in, bringing with it any twisted shred of vorticity it carries. (Video and image credit: NASA/JPL-Caltech/LANL/CNES/CNRS/INTA-CSIC/Space Science Institute/ISAE-Supaero/University of Arizona; via Gizmodo) Read the full article

[dead-generations]

orbits are straight lines is the fucked up thing. straight lines described by energy! unless they are three body orbits in which case things get really strange, but they are actually still completely straight lines. just dynamic ones. They aren't just straight, they are constant.

[yaldabaothadeez]

kinda weird there's no generally accepted term for "the conserved quantity associated with boosts"

[13thpythagoras]

[whirlybirdwhat]

HURRICANE COMIN RIGHT AT ME

AND STILL

STILL ENGINEERING HOMEWORK

[icepixie]

Have to admit, watching skaters do knee slides or otherwise get down on the ice as part of their choreography and bounce back up without looking like their knees and backs are going to self-destruct is far more impressive than any jump.

[biology-geology-beaches-india]

TSRNOSS, p 806.

[unproduciblesmackdown]

just remembered rollerskating....look out world

[erbiumspectrum]

I know that on a popsci level people are obsessed with quantum physics and back when I was in my early teens and fascinated with science that popsci image got me hooked too but now that I actually have to study some of it. It makes me want to beat the shit out of a particle. I don't want to say I hate quantum physics bc I don't want to spoil my attitude towards it (and make studying it even harder) but. I hate quantum physics :'))))