Physics - July 2007

2007-07-02 06:16:36 · 6 answers · asked by Shaurya S 1

On what basis does electrons revolve around the nucleus in different orbits?What decides the shape of an orbital?

2007-07-02 06:11:16 · 4 answers · asked by Anonymous

Two parallel cylindrical wires made of lead
have diameters D=4mm and the distance
between their axes is L=5mm.

Both wires are in superconductive state. The wires
carry currents I=60A each in opposite directions.

What is the force of magnetic relpulsion F between the wires per unit length (per 1 meter)?

Note:
Meissner effect: magnetic field does penetrate
inside bulk lead (type I superconductor).

Easy-to-use magnetic force calculator
can be found here:
http://hyperphysics.phy-astr.gsu.edu/hbase/magnetic/wirfor.html

2007-07-02 05:54:59 · 4 answers · asked by Alexander 6

Can a object made of glass (candle stand - size & shape of an ice cube) break on it's own without being touched or moved from it's place? Please let me know if you need me to be more specific with my question. A very strange incident has occured and it seems very very mysterious

2007-07-02 05:50:08 · 9 answers · asked by Wils D 2

thank you for taking your time to answer this question

2007-07-02 05:23:38 · 8 answers · asked by Anonymous

2007-07-02 05:15:39 · 5 answers · asked by bihariraja 3

2007-07-02 05:08:38 · 2 answers · asked by usman a 1

i want to ask that what is between the two energy packets?

2007-07-02 05:06:03 · 3 answers · asked by usman a 1

What is the energy of a microwave photon of wavelenght 1.00mm?

Please help me! I just dont get it . thank u!!

2007-07-02 04:54:07 · 8 answers · asked by Anonymous

I have a lab where the only info given is the distance a rubberband stretches. And I need to find the force (N) that the rubberband exerts. Can someone help me out on the first one? The rubberband stretches 10.4 cm. The professor said I can't use Hookes Law due to the fact it is hard to determine the equilibrium of a rubberband? What is another formula I can use?

2007-07-02 04:40:22 · 5 answers · asked by benzene boy 1

Find the average velocity of projectile betweem the instants it crosses half the maximum height. it is projected at an angle theta with the horizontal at speed u.

2007-07-02 04:29:56 · 5 answers · asked by rock_bottom456 2

physicists seeking the universal answer to what Einstein sought out his entire life.
Of course, it gets so complicated sometimes that there are probably only a couple hundred guys who can actually understand it good enough to even come close to knowing if its realistic or not.
I've read a lot about it, and it makes sense sometimes, but it seems like it might just be a bunch of theoretical hocus pocus to complicated to prove or debunk.
I think that the real answer to this question will be a lot simpler and mind blowing as Einstein's concepts were when they first came out. Simple and eventually proven. Not completely proven, but two atomic clocks, one still and the other in a jet traveling around the world sounds like good enough proof for me.
Does anyone know of any good references on this subject besides Brian Greene's books?

2007-07-02 03:41:12 · 14 answers · asked by tatereatinmic 3

2007-07-02 03:30:57 · 3 answers · asked by Dheeraj G 1

Can anyone tell me how to make or construct a working model on Newtons (any 1 of 3) law of motion or law of gravitation????

2007-07-02 03:25:04 · 3 answers · asked by Mohak K 1

A man pulls a block of mass m = 25 kg up an incline at a slow constant velocity for a distance of d = 5 m. The incline makes an angle q = 25° with the horizontal. The coefficient of kinetic friction between the block and the inclined plane is µk = 0.4.

a) What is the work Wm done by the man?

At the top of the incline, the string breaks and the block, assumed to be at rest when the string breaks, slides down a distance d = 5 m before it reaches a frictionless horizontal surface. A spring is mounted horizontally on the frictionless surface with one end attached to a wall. The block hits the spring, compresses it a distance L = 0.8 m, then rebounds back from the spring, retraces its path along the horizontal surface, and climbs up the incline.

b) What is the speed v of the block when it first reaches the horizontal surface?

c) What is the spring constant k of the spring?

d) How far up the incline d1 does the block rebound?

2007-07-02 03:13:18 · 2 answers · asked by Anonymous

All the scientists die and go to heaven. They decide to play hide-n-seek

Unfortunately Einstein is the one who has the den...........He is supposed to count up to 100...and then start searching.....

Everyone starts hiding except Newton.........

Newton just draws a square of 1 meter and stands in it right in front of Einstein.

Einstein's counting 1,2,3......97,98,99.....100........ He opens his eyes and finds Newton standing in front........

Einstein says " newton's out..newton's out....."

Newton denies and says "I am not out........I am not Newton......"

Who is out and why ?

2007-07-02 02:22:10 · 5 answers · asked by Dilip kumar 2

2007-07-02 02:19:12 · 5 answers · asked by Anonymous

I was pondering relativity (as you do) and wondered why a particle can't go faster than the speed of light when we could could send a particle at the speed of light in one direction, and another particle in the opposite direction so that relative to each other the first could be considered still and the other is therefore travelling at the speed of light *2. Extrapolating that idea, why not send a particle accellerator at the speed of light in one direction, and then accellerate a particle from it so the particle is going at the speed of light *2, and then from our lab (where we started) do the same thing in the opposite direction, therefore creating particles travelling at 4* the speed of light.

Clearly some pretty major technological issue to overcome :) but surely that sound in theory???

2007-07-02 01:49:28 · 9 answers · asked by Ross A 1

2007-07-02 01:44:01 · 10 answers · asked by Anonymous

when elecricity comes into your house and goes round the circuit? -does it go back to the power station or what?
Also why does elecricity have to go in a circuit?

2007-07-02 01:30:42 · 6 answers · asked by Zirkon 3

Is dark matter normal matter or a special type of matter?

is it dark because it does not reflect any light.(obsorbing all, or letting it pass through) or is it dark because there is no light to reflect? (i.e. no sun to brighten it)

Since it has gravity, has it condensed into lump's, planets and 'dark' suns?

and why is there so much of it when comparing the percentage to the amount 'bright' matter in our galaxy?

2007-07-02 00:37:36 · 10 answers · asked by mrzwink 7

speed in feet per second

2007-07-01 23:49:58 · 6 answers · asked by Rhoebie M 1

1. what is the reason why Candela (cd) is used as a unit in luminous intensity?

2. which will provide greater efficiency, a 50watt tungsten filament bulb?or a 40watt flourescent lamp

tnx a lot!

2007-07-01 23:40:48 · 1 answers · asked by asker guy 2

'If a tree falls in the forest and no one's there to hear it, does it make a sound?' QM's answer to that famous question seems to be 'No.' In QM the observer is an integral part of the system; observation creates reality out of a nebulous cloud of probability, Schroedinger's Cat being a classic example. Doesn't it seem much more likely that 'probability waves' aren't dependent on some arbitrary consciousness; the tree DOES make a sound, the cat IS alive or dead and all the other properties of matter exist indeppendent of an observer. It seems more like the equations of Quantum Mechanics describe the state of mind of an observer rather than the observed (or not) system, and it's human conceit that projects this onto the real world?

2007-07-01 23:23:04 · 8 answers · asked by AmigaJoe 3

Some decade before a scientist explained why neutrino has momentum though it doesn't have mass. But recent fact shows that neutrino DOES HAVE MASS

2007-07-01 23:16:44 · 7 answers · asked by Steve Andrew M 1

1. Give a qualitative account of Einstein’s theory of the photoelectric effect.

2. Describe two observed features of a photoelectric-effect experiment that could not be explained by classical (non-quantum) theory.

2007-07-01 21:16:32 · 1 answers · asked by walt 2

2007-07-01 20:45:35 · 7 answers · asked by abdul r 1

Wouldn't this mean it has infinite mass and charge densities? Wouldn't that make every electron a singularity?
I know I must be mistaken, so can anyone clear this up?

2007-07-01 18:33:03 · 2 answers · asked by Anonymous

Why does anyone exist? Why does time exist? Where did space come from? If you believe it was from God, well then where did he come from? Was he created? Who created him? Who created what created him? If he has always existed, he had to start at one point or another with or without the measurement of time or anything else. Are there any theories to these questions or do we simply have no idea? Thinking about this I think I've reached the logical limit of my brain :-/ I mean, even then you start questioning what existence means. Is there something beyond it or another form? Different dimensions??? Well who created the dimensions? Where did it originate? It makes the question, "What came first, the chicken or the egg?" seem crude..... I think I'm going to go take a Tylenol.

2007-07-01 17:46:26 · 6 answers · asked by Sandfrog 3

2007-07-01 16:26:49 · 5 answers · asked by pawan k 1