1

Physics, Astronomy & Cosmology / What is the relation between the London effect and the Meissner effect?

« on: 25/11/2011 23:39:18 »

In the gravity probe mission; a perfect gyroscope was used to make measurements relevant to the mission. The gyroscope was added with a layer of niobium, then brought down to low temperatures to allow superconductivity to happen. The London effect makes the niobium ball generate its own magnetic field. How is the London effect related to the Meissner effect(Quantum lock)?

Thanks in advance

edit:
What about the Josephson effect?

2

Physics, Astronomy & Cosmology / Where can I get a gyroscope?

« on: 12/09/2011 00:22:48 »

Thanks!!

3

Physics, Astronomy & Cosmology / Where can I get a gyroscope?

« on: 11/09/2011 00:13:46 »

I recently started to read a book about gyroscopes (Carl Machover), it is very interesting. I would like to understand the precession effect by experimenting with a real gyroscope. I have not had any luck finding one with google; mostly all the hits are about spinning tops.

Does anyone knows where I can get one? (two degree of freedom preferably(economic too))

Thanks

4

Physics, Astronomy & Cosmology / Can you experience negative g's?

« on: 02/11/2010 22:24:52 »

Is there anyway in which you can experience negative g's?

5

Physiology & Medicine / How does the brain process depth perception?

« on: 04/07/2010 05:00:14 »

How does our brain process the information from our eyes to tell the distance away from objects?

6

Physics, Astronomy & Cosmology / what happened to the hadrons whe they collided in the LHC.

« on: 14/05/2010 11:46:55 »

Did the hadrons recombine, or did they desintegrate in dark energy?

7

Physics, Astronomy & Cosmology / How is the International space station built?

« on: 03/04/2010 23:44:02 »

http://i.usatoday.net/tech/graphics/iss_timeline/flash.htm

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Physics, Astronomy & Cosmology / How to see the dark part of the earth?

« on: 03/04/2010 23:35:06 »

I found this cool site; so here it is

http://www.fourmilab.ch/cgi-bin/Earth

9

Chemistry / Can you turn a liquid into "marbles"?

« on: 03/04/2010 23:33:30 »

ok.

10

Chemistry / Can you turn a liquid into "marbles"?

« on: 02/04/2010 20:12:44 »

Is this true? http://www.youtube.com/watch?v=vCeAfKCC2ng

11

Physics, Astronomy & Cosmology / Does it matters how close masses are?

« on: 30/01/2010 03:44:00 »

thanks, everything comes to play in the reference from which we catalog objects.

12

Physics, Astronomy & Cosmology / Does it matters how close masses are?

« on: 29/01/2010 16:51:10 »

 []
How close does matter has to be together so it can be consider a single mass object?

13

Physics, Astronomy & Cosmology / Is dry air easier to heat up than humid air?

« on: 01/12/2009 23:40:59 »

 []
Thanks in advance for your response.

14

Technology / How Does Wolframalpha work it all out ?

« on: 19/07/2009 04:09:08 »

it even has an answer for a # divided by 0
http://www09.wolframalpha.com/input/?i=20%2F0

15

Physics, Astronomy & Cosmology / What is the difference between this two calculations?

« on: 28/06/2009 02:49:38 »

thanks.

16

Physics, Astronomy & Cosmology / Who is up for a challenge?

« on: 26/06/2009 00:09:34 »

Is there any program like Multisim for physics?

17

Physics, Astronomy & Cosmology / What is the difference between this two calculations?

« on: 26/06/2009 00:08:05 »

arithmetic mean and geometric mean of two numbers.
It all depends . . . .

For example:
there is a bandwidth of 200Hz for a band pass filter. The central critical frequency is 1000Hz.

we can assume that the lower limit is 900hz and the upper limit is 1100Hz.

okay, what if I'm only given the upper and lower limits?
upper limit=1100 and  lower limit=900
How should I calculate the central critical frequency?
→By using the arithmetic mean I obtain:
 (1100+900)/2=1000Hz
→By using the geometric mean I obtain:
 (1100*900)^0.5=994.99Hz
→or
 (1100-900)=200,, then 200/2=100,,
 after 1100-100=1000Hz or 900+100=1000Hz

Which one should I use   []
 and Why

18

Physics, Astronomy & Cosmology / Re: What causes the density of water to change in the way that it does?

« on: 25/06/2009 04:11:41 »

are any other elements or substances with this behavior?

19

Physics, Astronomy & Cosmology / What is the difference between this two calculations?

« on: 24/06/2009 23:38:16 »

(95+95)/2 and √(95*95)

mod:
when do I have to use each and what is the specific purpose of each one?

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Physics, Astronomy & Cosmology / Who is up for a challenge?

« on: 24/06/2009 23:36:20 »

For point masses they both arrive at the same time,

Why?

I would like to say that the acceleration in both balls is the same in the Y direction, they both end the journey at the same time.  this is my assumption in a friction-free world and a flywheel effect free environment.

s