Author Topic: Calling on all physics geeks  (Read 536 times)

0 Members and 1 Guest are viewing this topic.

Offline rumborak

  • DT.net Veteran
  • ****
  • Posts: 26114
Calling on all physics geeks
« on: January 03, 2013, 02:54:52 AM »
I am trying to remember a certain technique in physics, but just can't think of the name. It's used when calculating forces etc in an equilibrium. What you do is to add an infinitesimal displacement to a border and see what the new energy distribution is. The difference in the energy from the equilibrium energy gives you the force acting on that border.
There is a term for that computational tool, but what is it?
"I liked when Myung looked like a women's figure skating champion."

Offline wasteland

  • DTF.org Alumni
  • ****
  • Posts: 7934
  • Gender: Male
  • Jay Beckenstein was in Spyro Gyra, AND YOU?
Re: Calling on all physics geeks
« Reply #1 on: January 03, 2013, 03:01:46 AM »
Perturbation Theory? Hamilton's Integral Principle?
:slayer: Somewhere, over the wasteland..... bootlegs fly :slayer:
MoraWintersoul is the BEST person.
- Marco

Offline rumborak

  • DT.net Veteran
  • ****
  • Posts: 26114
Re: Calling on all physics geeks
« Reply #2 on: January 03, 2013, 03:03:47 AM »
Aaah, found it finally. It's called "Virtual work" and works with the calculus of variations..

This thread can now be about bunnies in a basket.

EDIT: Ooh, pertubation theory is cool too. Thanks!
"I liked when Myung looked like a women's figure skating champion."

Offline wasteland

  • DTF.org Alumni
  • ****
  • Posts: 7934
  • Gender: Male
  • Jay Beckenstein was in Spyro Gyra, AND YOU?
Re: Calling on all physics geeks
« Reply #3 on: January 03, 2013, 03:05:23 AM »
Aaah, found it finally. It's called "Virtual work" and works with the calculus of variations..

This thread can now be about bunnies in a basket.

Hamilton's Principle, then. What's that you have to calculate, for curioisty? :)
:slayer: Somewhere, over the wasteland..... bootlegs fly :slayer:
MoraWintersoul is the BEST person.
- Marco

Offline rumborak

  • DT.net Veteran
  • ****
  • Posts: 26114
Re: Calling on all physics geeks
« Reply #4 on: January 03, 2013, 03:10:15 AM »
Interestingly, this has nothing to do with physics at all. I'm writing a paper where I'm optimizing a computational cloud in its configuration, and the method I use is very similar to Hamilton's Principle. Given that I'm already making heavy physical analogies in the paper, I figured I'd mention this too.
"I liked when Myung looked like a women's figure skating champion."

Offline wasteland

  • DTF.org Alumni
  • ****
  • Posts: 7934
  • Gender: Male
  • Jay Beckenstein was in Spyro Gyra, AND YOU?
Re: Calling on all physics geeks
« Reply #5 on: January 03, 2013, 03:12:02 AM »
Interestingly, this has nothing to do with physics at all. I'm writing a paper where I'm optimizing a computational cloud in its configuration, and the method I use is very similar to Hamilton's Principle. Given that I'm already making heavy physical analogies in the paper, I figured I'd mention this too.

It's very interesting. I would probably enjoy the read. Now onto my paper on amplifiers, again...  :-\
:slayer: Somewhere, over the wasteland..... bootlegs fly :slayer:
MoraWintersoul is the BEST person.
- Marco

Offline Sketchy

  • DTF.org Member
  • *
  • Posts: 2250
  • Gender: Male
  • More tea is required.
Re: Calling on all physics geeks
« Reply #6 on: January 03, 2013, 04:12:36 AM »
Sounds pretty wizard, I must say.
This is as exciting as superluminal neutrinos. The sexy thing is that this actually exists :D

Offline IDontNotDoThings

  • Speak the word...
  • Posts: 1542
  • Gender: Male
  • ...the word is all of us.
Re: Calling on all physics geeks
« Reply #7 on: August 19, 2017, 11:19:54 PM »
(necro because it's better than making a new thread)

So does anyone know if there's a formula I can use to determine an initial velocity from an initial force & mass? Like, if you wanted to use the displacement formula: s = ut + at^2/2, would there be a way to get u if all you had was the force you placed on the object & the object's mass? I've looked through my notes & I can't seem to find if there's a formula that relates the three variables directly. I know there's F = ma, but is there a variation on that where you have velocity instead of acceleration? This isn't anything urgent, but I'm working on a simulation & I'm wondering if that formula existed. Thanks in advance.

Edit: Nevermind, I figured it out
« Last Edit: August 20, 2017, 05:07:36 AM by IDontNotDoThings »

Offline JayOctavarium

  • I used to be a whorejerk
  • DTF.org Alumni
  • ****
  • Posts: 8253
  • Gender: Male
  • But then I took a Hef to the knee...
Re: Calling on all physics geeks
« Reply #8 on: August 20, 2017, 11:18:15 AM »
nerds
I just don't understand what they were trying to achieve with any part of the song, either individually or as a whole. You know what? It's the Platypus of Dream Theater songs. That bill doesn't go with that tail, or that strange little furry body, or those webbed feet, and oh god why does it have venomous spurs!? And then you find out it lays eggs too. The difference is that the Platypus is somehow functional despite being a crazy mishmash or leftover animal pieces

-BlobVanDam on "Scarred"

Offline Adami

  • DTF.org Alumni
  • ****
  • Posts: 24886
Re: Calling on all physics geeks
« Reply #9 on: August 20, 2017, 11:18:54 AM »
fanticide.bandcamp.com

Offline jasc15

  • Posts: 4844
  • Gender: Male
  • TTAL: Yeti welcome
Re: Calling on all physics geeks
« Reply #10 on: August 25, 2017, 02:55:01 PM »
Hey, I actually knew the answer to this one.  I learned it in a strength of materials class, but haven't used it since.