Physics - December 2006

What is louder : -20 dB or -30 dB ?

2006-12-26 05:14:19 · 6 answers · asked by Anonymous

2006-12-26 05:04:24 · 11 answers · asked by Mikey 3

I remember reading that a person can apply around 75% of body weight to pulling a rope.

What I'm looking at is hypothetical output on a 12:1 yacht winch adapted for tree work (Called a GRCS).

My searches result in hits selling electric winches.

2006-12-26 04:42:37 · 2 answers · asked by sanbornstrees 2

if general relativity deals with acceleration then why the fuss over super strings [ie. gravtons]

2006-12-26 04:29:58 · 5 answers · asked by mrg5834 1

2006-12-26 04:19:30 · 2 answers · asked by Anonymous

if I was to reverse, would the "time" i'm in make me younger or would the time around me be only thing reversed? even though a theoretical 4th Dimension, equations can still be manipulated to comply, but would the conformation include me or just around me?

2006-12-26 04:11:10 · 5 answers · asked by Anonymous

another car of the same mass.

2006-12-26 03:55:50 · 8 answers · asked by Anonymous

I've heard that because photons always travel at the speed of light they do not age. That is strange enough to think about, but I've been thinking about something even stranger lately. If I understand Lorentz contraction, anything that travels at light speed has no length in its direction of travel. So from an observers perspective wouldn't a photon effectivley be two dimensional? And how could it ever display its particle properties if this is true?

2006-12-26 03:54:33 · 3 answers · asked by gliss 2

i don't know if it means principles as an rules

2006-12-26 03:46:35 · 2 answers · asked by tania j 1

Can we coil it with a copper wire and convert it into an electromagnet??

2006-12-26 02:15:25 · 11 answers · asked by Ish 2

of food not physics

2006-12-26 02:11:06 · 2 answers · asked by Jolene D 1

I heard many people getting killed or injured from stray bullets from the sky, when irresponsible gun owners fire their gun in the air. This is prevalent in our country where there are wild celebrations during New Year's eve.

2006-12-26 00:40:22 · 12 answers · asked by Mr. Kite 2

in the same amount of time

2006-12-26 00:36:54 · 8 answers · asked by Ed 1

I know that the process is called quantum entanglement. But what act, once performed, entangles the atoms together?

2006-12-25 23:35:11 · 3 answers · asked by sassychickensuckerboy 4

2006-12-25 22:26:49 · 6 answers · asked by Kautuk S 1

If the temprature is 0 degrees today and forecast says tomorrow ill be twice as cold as today, what will be temprature tommorrow?

2006-12-25 21:46:26 · 17 answers · asked by sreenivasanil k 1

I like this question. Nobody knows the answer but me.

2006-12-25 21:39:06 · 14 answers · asked by wwwwwwwfe 1

2006-12-25 21:24:49 · 9 answers · asked by sivaxyz88 1

a hydrogen molecule, mass 2.00u and velocity 1.88x 10^3 m/s, collides elastically and head-on with an oxygen molecule, mass 32.0u and velocity 405m/s. The hydrogen molecule is moving to the right and the oxygen molecule is moving to the left in a straight plane.
(a) determine the velocity of seperation of the two molecules after the collision
(b) apply the law of conservation of momeentum to the collision
(c) determine the velocity of both molecules after the collision

2006-12-25 20:33:36 · 1 answers · asked by Anonymous

2006-12-25 20:15:26 · 3 answers · asked by varadha 1

Is there any scientific evidence that suggests time seems to pass by more slowly or quickly for certain species than it does for others? For example, assume the case of an insect with an average lifespan of ten days. To us this may seem ridiculously short - however, if 10 days to that insect feel the equivalent of 80 years for us, isn't it all a moot point being relative?

Is there any evidence that suggests such a thing in either direction?

2006-12-25 19:48:56 · 6 answers · asked by NY 2

2006-12-25 18:26:39 · 14 answers · asked by Mr. Kite 2

RL AC circuit

2006-12-25 18:21:12 · 2 answers · asked by Anonymous

2006-12-25 17:54:09 · 4 answers · asked by ahopai 1

Can a very small magnet be very powerful? I know everyone's heard of the toys called "Magnetix", which has supposedly caused the death of a child. They are so powerful, that they actually caused his intestines to close, forcing bacteria into his blood stream.

There was the James Bond movie, "Live and Let Die", where he had a watch with a super-high powered magnet, which you could use to grab a piece of metal from 10 feet away. I don't know if they are THAT powerful, but think of the possibilities. A super powerful magnet is in the ceiling of a convienence store. Someone goes in and brandishes a gun. The magnet causes the gun to go flying out of the robbers hand, and the robbery is botched.

Anyone think that would work? Could magnets be THAT powerful, or THAT beneficial to humanity?

2006-12-25 17:41:43 · 7 answers · asked by snafu1 2

How efficient is a rocket at using its fuel to move an object. Assuming you put a rocket on a car with limitless fuel and the weight of the fuel isn't a concideration, is it more efficient then the car engine?

2006-12-25 17:05:04 · 3 answers · asked by Michael K 2

If not,why can Penguins live in Antartica?

2006-12-25 16:58:12 · 8 answers · asked by Abdul Kalam 2

What I mean is if a police officer wants to know how long it takes you to drive one kilometre (or mile), they would need to record the time it takes you to travel an actual km or mile. If they have clocked your speed at a radar point they should really be talking metres-yards/sec, since this is all they have seen you travel. Speed or velocity is a measure of distance divided by time. If you have travelled slowly for half a mile, and accelerated past a radar trap, could you not argue that your average speed over a whole mile was within the limit. Also you could not be convicted of speeding at a precise time, say 4.00PM, because at a point in time you do not travel any distance

2006-12-25 16:47:44 · 8 answers · asked by Anonymous

At the equator, the earth is spinning at 25,000 mph. A 747 cruises around 500-700 mph. How come when a plane is flying in the direction that the earth is spinning, it isn't actually going backwards? (and a side question that goes with this one; how come when you throw a tennis ball in the air in a plane, it doesn't smash through the back?)

2006-12-25 16:05:50 · 15 answers · asked by jon 2

why?

2006-12-25 15:58:30 · 10 answers · asked by chinna u 1