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Forum: General Physics Questions
Welcome to the General Physics Questions forum!
This forum is for discussing general physics

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a problem on motion by perucho on 2010-08-23 02:42:25
Hi all,
The motion of the mass center (MC) of a galaxy is governed by the ODE
d^2x/dt^2 - (2/t^2)x = -2v_0/t,
where v_0 is the speed of MC at the reference time t_0 > 0. At a critic time t* > 0, d^2x/dt^2(t*) = a*, and at infinite d^2x/dt^2(\infty) = a_\infty.
Find t_0 and x(t) in terms of the data t*, v_0, a* and a_\infty.
Thanks in advance by your attention!
perucho  
[ reply | up ]
Gravigenic cooling ! by Brenton on 2009-10-05 01:44:13
Thanks bci1 for black holes.

This is an absurd idea of mine that needs critiquing. Recently , Potassium and Rubidium atoms were cooled to ultracold temperatures through a refrigerator like entropy removing process. My idea is to cool the space-time around them as well. What you do is set up the system and then next to it , place a rotating body ? or something that will make space-time less dense. That way , energy will flow away from the atoms/laser and towards the rotating body. Only problem , it's a cycle. Energy has to flow back to the atoms/laser. So I propose placing a partial barrier around the atoms/laser so when energy/space-time flows back to the atoms/laser , it will be slowed and thus entropy will drop ! Is this crap or cool ?

Gravigenic cooling !?!?

Brenton
[ reply | up ]
Black Holes ? by Brenton on 2009-09-27 22:19:57
Thx bloftin and bci1 for those comments on E=mc^2 and space debris. Sorry it took so long to respond.

I read somewhere that on small enough scales , points NO LONGER EXIST and matter as we know it ceases to exist in a black hole.

I applied this to my version of a black hole model and considering the merger of say , 2 black holes or matter falling into a black hole , I assume asymmetry and extremely chaotic conditions , thus I  postulate the existence of multiple singularities which in a rotating black hole , could "orbit" around some center of mass. These singularities would be "probability" clouds where the mass aggregated there would behave like fullerene ( 1000k>quantum , 1000k<classical ) where it ( mass ) would display quantum mechanical properties like superposition etc. depending on surrounding temperature ? The problem I have is that gravity slows time and black holes are the ultimate in gravity but we supposedly live in an atemporal universe and scientists talk about ring singularities from rotating black holes so maybe I'm alright ? What do you think ?

I love PlanetPhysics !

Brenton
[ reply | up ]
E = m c ^2 ? by Brenton on 2009-08-10 02:50:18
Hi guys/gals , I got another one :

I read in a LHC brochure that a particle with mass can't exceed the speed of light but that its energy can be infinite if necessary. That can't possibly match with E=mc^2 because both sides won't equal each other. On one side the energy will be infinite. On the other side , c^2 is large but for very large E , c^2 is not large enough and m has a limit ; the only way to equal the energy is to form a black hole but I'm sure that wouldn't happen in every case. For example , an "infinitely" energetic proton would most assuredly have brownian motion v= approx. c , mass PeV< (I'm guessing) , length approx. 2 meters etc. Then the one factor that would have to change as E goes up would be the length. Therefore , cosmic strings. I guess it could work then right ??? Hi Martha !

Brenton
[ reply | up ]
Getting rid of space debris ? by Brenton on 2009-07-18 18:01:53
The solution ? to space debris lies possibly in putting liquid in space. For fast moving objects , they would either ricochet into space or burn in the atmosphere. For slow moving objects , they would aggregate into a larger mass and be attracted towards the Earth ; with the liquid evaporating and the debris burning up in the atmosphere. Problems and solutions : interfere with ground based astronomy ? Evaporate liquid or move it with IR lasers. Satellite protection ? I'm sure the "blobs" can be charged and manipulated magnetically to avoid collisions with structures in space. Logistics ? The liquid can be brought up in increments and sprayed by the ISS , space shuttles , rockets and space elevators. Polluted atmosphere ? We can build synthetic trees to remove the chemicals ( depending on what type of liquid we use ) that are present in the air. Etc. ? Etc. ! What do you think ? Hi Vilma ! Wats up Luke ?
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