Physics - July 2007

i dont know if i am right but i always thought that all the chemicals was always on the planet

so how come things like CFCs are harmful but didnt harm the environment a thousand years ago

thank you for your help


xxx


vici

2007-07-26 07:22:05 · 7 answers · asked by vici 4

I get about 10 quick beats right before an incoming call. Why does that happen?

2007-07-26 07:17:04 · 4 answers · asked by hi 1

this question had been hard to answer by many scientists, not because they can't predict what will happen in the future but vecause simply they will never have such thing, but I have another opinion and by the way, don't give any formulas and answers you think if you choose LONG words in it yo would answer right, or think that you have answred right

2007-07-26 07:03:36 · 8 answers · asked by Anonymous

I am just beginning to study Physics and while learning about Newton's Laws I have seen the symbol when comparing two quantities, such as the masses of different objects. It looks similar to two greater-than symbols right next to each other, such as ">>" except the one on the right is slightly larger. If anyone can help it would be greatly appreciated. Thanks

2007-07-26 06:26:22 · 3 answers · asked by Mark the man 2

2007-07-26 06:12:00 · 8 answers · asked by GCM 1

2007-07-26 05:49:12 · 15 answers · asked by wolfey 1

A living specimen in equilibrium with the atmosphere contains one atom of 14C (half-life = 5730 years) for every 7.70×1011 stable carbon atoms. An archeological sample of wood (cellulose, C12H22O11) contains 23.6 mg of carbon. When the sample is placed inside a shielded beta counter with 82.0% counting efficiency, 821 counts are accumulated in one week. Assuming that the cosmic-ray flux and the Earth's atmosphere have not changed appreciably since the sample was formed, calculate the age (in years) of the sample.

2007-07-26 05:49:08 · 2 answers · asked by Anonymous

If you hear an echo one-second after your holler is reflected from a canyon wall 150 meters away, how fast is your voice travelling?
How does a wave's speed relate to its frequency and wavelength?

2007-07-26 05:43:59 · 4 answers · asked by Anonymous

velocity of sound increases with humidity.So the question is when humidity is more,before or after rainfall.

2007-07-26 05:31:22 · 3 answers · asked by gyan 1

Has this ever been solved?
Is it even possible to solve this?
Lets see Energy is equal to Mass times Carbon squared?
Whats not solvable?

2007-07-26 05:20:49 · 15 answers · asked by Anonymous

It is true that the basic laws of physics say that nothing that has any mass can travel faster then the speed of light, but energy does not have any mass. So if you were able to surround an object in an energy bubble and maintain that bubble of energy for a prolonged period of time could you then propel the object beyond the speed of light and if so why isn't NASA working on building such technology, or is this still the realm of science fiction

2007-07-26 05:16:31 · 11 answers · asked by Anonymous

As I understand it it means that nothing really exists unless a person is looking at it, all the atoms that make up any object could be at any point in the universe and come together when someone looks at it.
http://news.bbc.co.uk/1/hi/sci/tech/6914175.stm

Iv just tested this. I closed my eyes and touched a wall. Not looking at it and neither was anyone else because it was an inside wall, so therefore it should not be there. Of course it was.

Am I missing something here? Things dont just not exist if us humans dont look at them.
I must have got this wrong, could someone explain it please. In laymens terms please.

2007-07-26 04:56:15 · 11 answers · asked by futuretopgun101 5

ie. no thrust of any kind

2007-07-26 04:15:56 · 6 answers · asked by Olof 2

Two railroad cars, each of mass 6520 kg and traveling 95 km/h, collide head-on and come to rest. How much thermal energy is produced in this collision?

2007-07-26 03:57:18 · 4 answers · asked by katherine g 2

The law states that at great distances(as in light years distance), gravity comes into effect. But what happens what the size is a lot smaller, say, as small as a pea, and the distance is closer, say, ten miles? Is there any gravity pull going on?

2007-07-26 03:33:39 · 11 answers · asked by jarod_jared 3

klystrons are used to generate microwaves but why should microwaves be generated?

2007-07-26 03:09:47 · 3 answers · asked by Red Falcon 1

2007-07-26 03:01:51 · 4 answers · asked by hrimfaxi69 1

10 points for best and easy to understand answer.

2007-07-26 02:49:36 · 7 answers · asked by Anonymous

2007-07-26 02:44:32 · 3 answers · asked by Anonymous

why the power dissipated in series and parallel load connection is equal to the sum power supplied by the source?

2007-07-26 02:23:45 · 5 answers · asked by Anonymous

2007-07-26 01:33:23 · 10 answers · asked by i-sena 1

2007-07-26 01:31:10 · 6 answers · asked by i-sena 1

Albert Einstein said that if we get the speed of light,we will be able to travel in future..

or by another saying we can travel in past life,

i believe that it mat be possible to go in past life,but in past life we will not be able to take part in any activity & not be able to change any condition...

and i dont think we can be able to travel in future which has not occured ,although we get speed of light..

frnds what do u think??

2007-07-26 00:56:20 · 9 answers · asked by Anonymous

The faster you go in time, the slower time goes but the older we get is that true?

2007-07-26 00:39:25 · 3 answers · asked by Anonymous

2007-07-26 00:30:31 · 3 answers · asked by Anonymous

I have read the answers to the previous questions on absolute zero but is there an opposite - Absolute maximum. Ok I know that it in theory its infinate but the total amount of matter and energy in the universe converted to heat must be the limiting factor. What is it?

2007-07-26 00:19:27 · 4 answers · asked by nic b 3

You hear people talking about time as the 4th physical dimension and how it slows down based on gravity, etc.

Isn't this inherently flawed? Isn't time constant regardless of how slow things actually move? I mean, if a clock records time passing fast when further away from the Earth doesn't that just mean that the elements used to measure time are moving faster? Time is still constant, things are just happening faster.

2007-07-26 00:05:22 · 8 answers · asked by Anonymous

ie, what is hydrogen, helium, oxygen, nitrogen and the rest, where do we find them and how do we use them? Why do they act the way they do when they're heated up and cooled down? How on earth can you have a liquid gas?? surely a contradiction in terms? what would happen if you drank liquid oxygen? or the others for that matter

2007-07-26 00:03:24 · 8 answers · asked by Anonymous

Is it something to do with the pressure i.e. the atmospheres inside the can, compressing the gas into liquid form?

Any info would be much appreciated...

2007-07-25 23:53:52 · 6 answers · asked by benedictgrima 2

Gravitational field strength increases above the surface of the Earth. Yet it decreases below the surface of the Earth, why is this? I know it has something do with having a force above you.

2007-07-25 23:19:43 · 6 answers · asked by Anonymous