Physics - August 2007

2007-08-23 06:49:25 · 14 answers · asked by :)Kam31896:) 2

2007-08-23 06:43:59 · 24 answers · asked by dale t 1

Thick flat plate creates uniform gravitation field g=9.8m/s². The train moves at constant speed c/2 along straight track on the surface of the plate.

What is acceleration of gravity on board the train?


Could you, please, keep the solution within high school level, because otherwise I will be unable to understand it. Thank you.

2007-08-23 06:18:11 · 8 answers · asked by Alexander 6

and to turn from a gas to a liquid is called condensation and back is called evaporation, and freeze is liqiuid to solid and melt is solid to liquid, and sublimation is solid to a gas. Then what are the missing transformation? I.e. Solid/Gas/Liquid to Plasma and back and Gas to Solid?

2007-08-23 06:00:47 · 5 answers · asked by indie9999 2

Hi,

We say matter is something that has mass.
So, can we say lepton, quark, W and Z boson etc. are matters because they have mass?
If mass is the quantity of matter that a body contains, then these particles are matter.

Scientists also say fermions are the littlest units of a matter.
W and Z bosons also have mass but fermions are not their littlest units.

How can we describe mass and matter in modern science?

PLEASE DO NOT ANSWER WITH LINKS.

Thanks a lot.

2007-08-23 05:13:00 · 4 answers · asked by survey taker 2

The heated material has more energy than before, so does it weigth more?
I know the gain would be very very very small, but does this happen? m=E/c2

2007-08-23 04:47:19 · 8 answers · asked by Anonymous

2007-08-23 03:26:59 · 17 answers · asked by Harsh 2

I know it's wrong but can someone explain why?

2007-08-23 01:40:33 · 2 answers · asked by Anonymous

2007-08-23 01:27:18 · 1 answers · asked by n4dia87 1

i want a small laser cutter for cutting of hard granite stone with the depth of 3 to 4 inches.that laser must be carry bull in a bag.

2007-08-22 23:35:17 · 3 answers · asked by Anonymous

i want a small laser cutter for cutting of hard granite stone with the depth of 3 to 4 inches.that laser must be carry bull in a bag.

2007-08-22 23:34:40 · 2 answers · asked by Anonymous

i want to input mass and speed as variables

2007-08-22 19:09:28 · 6 answers · asked by besharali_315 1

how does sunspot activity on the sun effect earths power grid and satellite communications

2007-08-22 19:03:26 · 3 answers · asked by Anonymous

Professor Steven Jones has actually tested steel samples from the towers, he definitely found thermate traces. The one major thing he did point out was 'yellow molten metal' flowing from the impact floors. Its on all the news footage so theres no denying it happened. Now the only material on earth that can flow yellow in a liquid state is thermate (Im no scientist but I would presume its the sulfur that makes it appear yellow.) Now Ive seen the videos, so have millions of people , most without realising what they were looking at. But Steven Jones is a very learned man, he studies things like this, and I believe what he has found is definite proof of thermate cutting charges. If you believe Bush's story or not you need to watch a free to air doco called "911 Mysteries" it offers up a multitude of reasons why 911 happened the way it did, most if not all of them scarily believable.....
The film maker Sofia Smallstorm cannot tell you that it definitely was an inside job, all she does is present the facts and once youve watched it you will start thinking....that much I can promise you.
And one more thing while Im here........the Bush apologists will always argue that the steel didnt need to melt to cause the floors to collapse, thats fair enough BUT. What they expect us to believe is that the support clips all failed at the impact floors which caused a pancake effect right??? Seems like a reasonable argument, even the official report tells us the floors pancaked. But there is one major flaw that they cant explain and Ill tell you what it is. For a floor to pancake it has to fall through space to hit the floor beneath it, this breaks the supports holding up the lower floor and so on (about 80 times till the mass reaches ground level.) now even if we give each floor an amazingly fast half second to travel through that space crushing all the support steel, girders, steel mesh, interior walls, office furniture etc, the real world time for the impact floors to reach ground level should have been around 40 seconds!!! (thats 80 storeys collapsing in a half second each!!!!
That plainly did not happen because THERE WAS NO PANCAKING!!!! The towers dropped within 14 seconds, almost as fast as freefal speed!!! And the only way that could have happened was by severing the 48 steel columns at the core, and probably severing the foundation steel in the basements also, there is no two ways about it.
The Bush apologists physics dont hold up to scrutiny, they dont hold up to critical analysis, and why so many videos all over the net showing survivors and firemen, cops and reporters all mentioning explosions inside the buildings?

2007-08-22 18:58:43 · 11 answers · asked by Anonymous

2007-08-22 18:13:33 · 9 answers · asked by Anonymous

20 msec
1/40 sec
500 msec

2007-08-22 16:34:31 · 1 answers · asked by achylles11 1

It is a dry day and you are washing your hair to remove the natural oils, then you thoroughly dry it, and run a plastic comb through it. Why would small bits of paper be atrractd to the comb.

2007-08-22 16:25:46 · 5 answers · asked by Diane S 1

2007-08-22 15:24:09 · 2 answers · asked by Dani J. 1

Given rho = 1.08 [ohm mm^2/m], what is sigma? ____ [m/mm^2/ohm]

how would I do this?? please help, thanks

2007-08-22 12:56:07 · 2 answers · asked by Anonymous

On the free response portion of the AP Physics B exam, are the graders sticklers about significant digits, or do they not care? If so, which rules for significant digits do they use? If not, are there any hard-and-fast rules for how many decimal places answers should be reported to? Thanks!

2007-08-22 12:36:20 · 3 answers · asked by AxiomOfChoice 2

Okay I need to know what the Angular Acceration of the wheels of a car that is traveling at a constant speed of 36km/h along curved road of radius R = 100m. Please help!!!! and if you could include the formula plz

Diameter of the wheels d=1m

2007-08-22 11:50:08 · 4 answers · asked by Alexander 6

when i was or 2 i dont know, me and my dad were looking for a madicine at a store, not even the workers ther could find it ,but the first one i grabed was the medicine.
when i went to mexicon about 5 years ago, we were in a hotel with a beach view, i saved my little cousins life.he was trying to get in the pool and i told him, no, u might drown so i made him put on a life saver, he sliped, and then if he hadnt of been wearing it , he would of hit his head and died.
and once, i was just talking without a seat belt and i just suddenly grabbend the seat belt and put it on out of nowhere, and suddenly we crashed 5 seconds later.and amazingly nothing happened.
oh.once i was going to the desert, ant our van was about to run out of gas, and i didnt know how to read.then i closed my eyes and told my dad, in 3 miles theres a gasolin station.ther was!and agen last week i went to a pool and i saved the same little cuzin from drowning.i have more stories.

2007-08-22 11:35:47 · 17 answers · asked by Anonymous

and for a thumbs up, how much area is transferred(as total volume doubled

2007-08-22 10:44:33 · 2 answers · asked by Book of Changes 3

Something that can't be found on the internet.

2007-08-22 10:38:49 · 14 answers · asked by Anonymous

and then all life? Seconds, minutes, minutes or days. Similarly, the sunlight we receive right now how long ago was it transmitted?

2007-08-22 10:35:39 · 7 answers · asked by Colonia 2

2007-08-22 10:13:10 · 10 answers · asked by Anonymous

Many quantum physicists spend their lives validating this point ... but why? What purpose would it serve us to know, anyway? Would it improve the quality of life we live in now?

Or is it just one of those curiosities ...

2007-08-22 09:52:50 · 7 answers · asked by Anonymous

Is the existance of black holes impossable because it causes velocities to exceed the limit of light speed?
Or
Do we need to revise the physical laws because we know that black holes really do exist?

2007-08-22 09:46:18 · 5 answers · asked by everymansmedium 2

2007-08-22 09:43:49 · 6 answers · asked by Anonymous

I figure the physcis community could help me out on this one...

So, General Relativity still depends upon human observation. The experiments, it all, etc. etc.

But if we took aware the observational element, humans, would it still be the same (the theory & spacetime being absolute)?

The observations of General Relativity are the assessment of our time measurement reconciled over large distances and speeds.

So if the universe is just out there, with no human to observe it would time exist? It would just be particle creation and deterioration-two things that I don't think solidify "time" seeing that they act contradictory.

It seems like the confirmations of General Relativity are confirmed by our own measurement system/observation. In raw reality, minus the human element, would it still be the same? Aren't we just being convinced of general relativity because of the need to undertsand velocity over huge distance?

I suck at articulating this so if you know what I mean

2007-08-22 09:33:27 · 7 answers · asked by Anonymous