Physics - September 2006

Start from definition of resistivity,charge of electron,cross sectional area,...etc. I have seen this in a electrical engineering book but cannot recall.Ohm's formula is very fanous and simple.But how he got this formula is not so simple.

2006-09-03 12:54:18 · 6 answers · asked by dwarf 3

Would they shoot out the other side? Bounce back and forth until they eventually sit suspended in the exact center? Or maybe you would gain speed until you hit terminal velocity, then as you get closer to the center your speed would slow down until you come to a slow and gentle stop at the center? Discuss.

And I know you can't actually build that tunnel so don't bother to mention the impossibility. It's hypothetical. ;-)

2006-09-03 12:37:08 · 19 answers · asked by moofy1974 2

If 1/x < or = f(x) < or = 1/x^3 (which it is if x < -1)

then lim f(x) =
.... . x=>-oo

2006-09-03 12:10:04 · 5 answers · asked by Olivia 4

2006-09-03 11:55:59 · 16 answers · asked by atgallagheruk 2

please explain it in a way that i might understand it!

2006-09-03 11:52:36 · 21 answers · asked by Anonymous

lim 2^-1/x =
x=>0-

2006-09-03 11:48:15 · 6 answers · asked by Olivia 4

Please, explain it in a way that i might understand it and not in a confusing way!

2006-09-03 11:45:33 · 19 answers · asked by Twilight Is Love 1

2006-09-03 10:21:51 · 4 answers · asked by joshuacm13 2

= x^2 + 3, if x < 0
= 0, if x = 0
f(x) = x^2 - 3 if 0 < x < 2
= 1 if x = 2
= x^3 - 7 if 2 < x.

Then lim ... f(x) =
x=>0+


I came up with two answers so far

-3 and 1

2006-09-03 08:50:48 · 4 answers · asked by chris 2

I'm having trouble understanding some of these basic electrostatic priciples and my book isn't much help. I've put them in a true/false format. If I could get at few answers, it would really help me understand this.

A positive point charge +q is placed at point p to the right of two charges, A and B. The net force on the +q charge is found to be zero. Which of the statements below are true?

A-----------B-----------P
++++++++++++++++++++q

True or False -- The magnitude of the charge A must be smaller than B.

True or False -- Reversing the sign of +q to -q would make the force on it nonzero.

True or False -- B must have the same sign as A and be less in magnitude.

True or False -- B must have the opposite sign from A and be less in magnitude.

True or False -- Either A or B must be positive.

2006-09-03 08:27:27 · 4 answers · asked by eltel2910 1

Time ,Distance, space? space-time?the product fo space and time?

2006-09-03 07:44:20 · 3 answers · asked by goring 6

I mean the energy gap shift calculated by Owen and Scalapino in superconductor materials in[Phys.Rev.lett.28,1559(1972)].i need a solution like the Fig.1(b) of this paper which includes more graphs for a larger range of n,or more n values.is there a paper which can help me for this or a computer program to solve equation(7) of this paper?

2006-09-03 07:26:02 · 1 answers · asked by oracle 1

electrostatics

2006-09-03 06:56:01 · 1 answers · asked by shri420 1

Is space time a vacuum? Was ather that Einstein was talking about also a vacuum? did the big bang created a vaccum?

2006-09-03 06:53:30 · 3 answers · asked by goring 6

Doesnt time divided by distance equal velocity dand velocity divided by time equals acceleration?that means it take longer to shrink?The more you accelerate the longer time it take to shrink in direction of motion?

2006-09-03 06:47:56 · 1 answers · asked by goring 6

2006-09-03 06:21:04 · 4 answers · asked by amey t 1

hopes expirement

2006-09-03 06:01:54 · 2 answers · asked by Anonymous

2006-09-03 05:48:18 · 5 answers · asked by goring 6

this is for my physics homework. please help me i need desperate help

2006-09-03 04:22:14 · 6 answers · asked by n_patel88 1

I know it involves cesium gas . . . where do you buy cesium gas? Also light pulse tuned to a specific frequency . . . what frequency?

2006-09-03 03:58:59 · 2 answers · asked by dsldragon2002 2

2006-09-03 03:56:14 · 9 answers · asked by puneet.1986 1

India is suffering from severe power-cut problem (especially the villages and small towns).Is there any method by which energy can be bought from those countries which don't have this problem and have enough money and resources to generate power?Maybe by storage of energy in large capacitors or so.....is it possible?I don't have any idea.Your comments.

2006-09-03 03:51:31 · 6 answers · asked by Goodgood 2

Proof for hyperbolic universe?
we heard that universe is elliptical
In Elliptic space, every light ray is a geodesic line. Light rays will be circling the geodesic line forever unless blocked by some object. We can see the same light ray of star many times, because the light ray circles in the space forever. Also, we can see the same star from opposite directions many times, because the light ray from other side of star circles in the space forever too. Since the Universe was at least many billions old. All the lights of the sun and stars had collected so many billions of years. The Universe should be so bright even at nighttime. Of course that is not the case. So the possibility of the Universe is only Hyperbolic Universe.

2006-09-03 03:20:03 · 11 answers · asked by Prakash 4

Other materials of your own are required and all apparatus used should be available in school science laboratories. The experiment must be feasible

2006-09-03 02:56:48 · 5 answers · asked by Anonymous

Just kidding again. Well for those of you who have not answered my previous question please read it at:
http://answers.yahoo.com/question/index;_ylt=AkN8vB4WOi8GcPr8E51UDz7sy6IX?qid=20060902191131AATJYUo
Anyways, this time I will finally get to what my question actually is because I had a little trouble doing it last time. Trouble, trouble on the double! Naughty Kerner-Odgis, too much pulling and pushing can hurt your thighs. It was the worst of times, it was the worst of times, and a little later the best of times became the worst of times and the times were worst than the best. Why not be a fish. For I think, therefore I am not but might be but I don't know what is happening. The solution to this problem lies soley in your shoe soles. I don't want to go to California! All that ends well ends weller. Kerner-Odgis would be very unproud of all this unpropper grammar. The wheels on the bus go PUSH!!! You can do it. Oh man. Holy hillbillies. Man oh man I need a pan. Okay now my questio

2006-09-03 02:51:21 · 14 answers · asked by Br 3

2006-09-03 02:37:48 · 8 answers · asked by Anonymous

work=F*d*costheta
F=force
d=displacement
cos theta=angle between F and d.

2006-09-03 02:34:58 · 9 answers · asked by kanishk y 1

2006-09-03 02:27:48 · 4 answers · asked by maymay 1

1000lb of gold or a ton of feathers

2006-09-03 02:11:08 · 12 answers · asked by Merranvo 2

I am currently tasked to do a model of a magship. One concept that i can't grasp is, what does the force produced act on and in which direction?

Any explanations will be greatly appreciated.

2006-09-03 01:54:21 · 3 answers · asked by lol 1