Physics - August 2006

Could anyone give me a basic idea of the physics principle behind the theory of MRI scanners?
What is being detected to form the image?

2006-08-01 09:24:31 · 4 answers · asked by hippoterry2005 3

Most other substances contract on freezing and its pretty logical but i dont understand why does water expand? can anybody suggest a reason?

2006-08-01 09:19:10 · 11 answers · asked by outofthisworld 2

i was just wondering what causes it> I think it also happens w/ porcelain plates>

2006-08-01 09:00:45 · 1 answers · asked by Anonymous

Someone please explain String Theory, in it's most simplest form, if possible. Basically String Theory is _________________________?

2006-08-01 08:51:50 · 6 answers · asked by Anonymous

In our dojo there are a few large excercise balls(about 2.5 ft in diameter and made from rubber) which we use to learn newcomers how to roll; however me and a few friends have tried frantically to try to lay or sit perfectly still on top of them as kind of a balance excercise. untill now noone has succeeded which has led me to believe it is impossible to do so
Am I right or am I wrong?
And why am I right or wrong?

2006-08-01 08:43:48 · 11 answers · asked by peter gunn 7

Can anyone tell me whether light waves travel and cause vibrations of molecules like sound waves cause vibrations of molecules parallel to the direction of wave propagation or any transverse waves which cause molecules to move at right angles to the direction of wave propagation. And if light causes vibration of molecules, why is it that we see light but we cannot hear it nor we can see sound.

2006-08-01 08:10:38 · 10 answers · asked by Y L 2

2006-08-01 08:07:45 · 13 answers · asked by fletcheyc 2

related to optics , interference

2006-08-01 07:39:53 · 9 answers · asked by voldemortandhogwarts 1

scientists built as i read an artificial material that make's a negative radiation making it travel faster than the speed of light what is the best site to read the details?

2006-08-01 07:13:57 · 6 answers · asked by piremegrun 1

Please read/skim the following 3 articles (fairly short), before responding.

(Edge-Localized Modes in plasmas look like solar flares.)
http://news.bbc.co.uk/2/hi/science/nature/3260985.stm

(ELM's are distinctly like other cosmic plasma discharges, possibly even the sun.)
http://epsppd.epfl.ch/Tarragona/pdf/P1_132.pdf

(We have learned how to prevent Edge-Localized Modes from flaring.)
http://www.newscientist.com/article.ns?id=dn9202&feedId=online-news_rss20

Now, if solar flares are really Edge-Localized Modes in an electromagnetic plasma discharge, can we use the same principles we use in the lab to regulate or prevent solar flares?

What could we do with this technology and what would be the implications of this technology if we were able to produce it?

Could we eliminate solar flares and coronal mass ejections in order to limit damage to sensitive electronics in space, and to protect astronauts from (or limit exposure to) charged particles in local space?

2006-08-01 07:10:20 · 5 answers · asked by Michael Gmirkin 3

2006-08-01 06:52:38 · 4 answers · asked by sharafudeen 2

2006-08-01 06:35:46 · 2 answers · asked by sharafudeen 2

2006-08-01 06:26:09 · 5 answers · asked by rekha c 3

i know dat sound is a meagre source of energy & its conversion cant be useful for commercial purposes but still i want to know that 1 decibel is equal to how many joules or ergs or else how many decibels make a joule. i mean i jus wanna measure sound in joules ?????????????????????????????????????????????????????

2006-08-01 06:01:58 · 4 answers · asked by Alishan A 1

i know dat sound is a meagre source of energy & its conversion cant be useful for commercial purposes but still i want to know that 1 decibel is equal to how many joules or ergs. i mean i jus wanna measure sound in joules

2006-08-01 06:00:29 · 2 answers · asked by Alishan A 1

When calculating the terminal velocity of a 2.5 pound ball falling in the sky at sea level, how do you determine the cross sectional area and then the drag coefficient?

2006-08-01 05:58:19 · 2 answers · asked by Anonymous

2006-08-01 05:57:06 · 4 answers · asked by Blah 2

2006-08-01 05:44:45 · 9 answers · asked by Anonymous

2006-08-01 05:43:22 · 8 answers · asked by Find out How 1

Without changing the medium in which it travels, is there a way to "force" any sound to travel faster then it's normal speed.

2006-08-01 05:10:56 · 12 answers · asked by justaskn 4

2006-08-01 04:23:11 · 14 answers · asked by Andy R 1

hey can any1 explain the phenomenon of thermal agitation in simple words 2 me . Im on this project & not able 2 undrstand ANYTHING so plz help me.

2006-08-01 04:18:06 · 4 answers · asked by Alishan A 1

The quantum particles take all posibles action, then we feel one of them... could be that the fate?

2006-08-01 04:09:36 · 6 answers · asked by Fenrok 1

And if the speed of light for some reason slowed to 10mph would you then be able to travel faster than it or is it a case that light travels at the maximium possible speed and if for some reason that maximum possible speed was increased then so would the speed of light?

2006-08-01 03:57:55 · 17 answers · asked by RSWN 2

2006-08-01 03:49:38 · 1 answers · asked by rikko 1

2006-08-01 03:32:48 · 5 answers · asked by oneindia 1

why are we not useing a craft that can fly into orbit? ( like star trek ) other then a rocket from the ground. cant we just use rocket jets to get us out of the atmosfear once we get up to high? I dont understand why we havent made this jump. can someone tell me why. are we still so primitive that we cant come up with this yet?

2006-08-01 03:30:11 · 2 answers · asked by Jason C 1

2006-08-01 03:23:41 · 2 answers · asked by Anonymous

y r cosmic rays more concentrated at poles of the earth and
their intensity is least at the equator?

2006-08-01 03:05:23 · 4 answers · asked by titan1992 2

If we connect a 200 watt and a 100 watt bulb in series and switch on the power supply, which one would glow brighter? Potential fall across which bulb will be greater?

The whole class answered the 200 watt bulb would glow brighter but the teacher said it was the 100 watt bulb. Either he's tricking us our he wants us to think better. He also asked us to prove or disprove his answer.

I could only think of the 200 watt bulb glowing brighter than the 100 watt bulb because in series connection, current is constant. Besides, the bulbs are of different wattage. Hence the potential fall across the 200 watt bulb should be higher.

Can anyone please help me out here and correct me if I'm wrong...

2006-08-01 02:41:56 · 7 answers · asked by Erin 2