I can't math.

I'm sorry, Dave. I'm afraid I can't do that.

[di-kot-o-me]

It's a coup.

[di-kot-o-me]

[s-c-i-guy]

[asapscience]

All of our idols as BABIES 😍 [Reddit]

[entheognosis]

[pettycentral]

[sci-universe]

Mathematician & trailblazer Katherine Johnson turns 100

On the image above, Katherine Johnson is calculating spacecraft trajectories… by hand! Astronaut John Glenn trusted her more than computers, and her accuracy in orbital mechanics equations helped NASA to fly the first men to the moon. On top of that, she was a race and gender pioneer.

Johnson turned 100 yesterday (26 Aug), which also coincided with Women’s Equality Day. How incredible?!

Johnson at the opening of Katherine G. Johnson Computational Research Facility at NASA’s Langley Research Center in 2017. Image credit: David C. Bowman/NASA

The story of Johnson, Dorothy Vaughan and Mary Jackson, three brilliant black female scientists whose calculations were critical to the success of early manned NASA missions, is told in the movie and book Hidden Figures.

[thewriterkb]

[fyphysica]

On the definition of  Angular Momentum

Anonymous asked:

Why is it mr^2 omega and not some other weird formula that is conserved? Why not mr^3 omega or mr^2 omega^2 ?

This is a great question. And to be honest, there is no intuitive answer as to why it is defined this way or that.

What makes the definition special?

Conservation laws can be understood better through the Lagrangian formulation of classical mechanics.

That’s the conservation of momentum for a free particle. It means that this quantity mv remains constant with time (not m2v, not m2v2 ,just mv).

And similarly for a rotating body, one can find that the quantity that remains constant wrt time is the angular momentum.

And that’s the best rationale using modern physics that can be provided for why Angular momentum takes the form that it does.

Any other form would just not be conserved. Sure, you can construct a Lagrangian that would give you the form that you need but that would not  represent anything physical !

Hope that answers your question. Thanks for asking !

** If you have not heard about Lagrangian formulation of classical mechanics, the wiki article on Principle of Least action is a really good place to start..

The principle of Least/Stationary action remains central in modern physics and mathematics, being applied in thermodynamics, fluid mechanics, the theory of relativity, quantum mechanics, particle physics, and string theory.

[ozneo]

[angryyoungcomputer]

Nicolaus Copernicus

[putlestory]

[angryyoungcomputer]

On June 28, 2009, Stephen Hawking hosted a party for time travelers, but he sent out the invitations only afterward.

No one turned up.

He offered this as experimental evidence that time travel is not possible.

“I sat there a long time,” he said, “but no one came.”

[veggieraptor]

[angryyoungcomputer]

Men have become the tools of their tools. - Henry David Thoreau

[sludged-deactivated20120219]

[nevver]

Space Invaders Chess set

[sciencenote]

[angryyoungcomputer]

Skinny Circuits

Rubbed on like a temporary tattoo these ultra-thin electronics bend and stretch with the skin. Their development paves the way for sensors that monitor heart and brain activity to take the place of bulky equipment and taped-on electrodes. Electronic components shrunk to the size of tiny bumps on the skin are connected with serpentine wires that meander like rivers, straightening rather than snapping when stretched. The whole thing is mounted on a rubbery sheet that mimics the elastic properties of skin. Known as epidermal electronics, the technology can even control computer games from voice commands. Worn on the gamer’s throat, the patches detect the electrical charges associated with the muscle movements of speech. The potential applications of linking electronics and biology in this way seem boundless.

[beh-a-ppy]