Physics - June 2007

We all have heard" If it happened once"....With all the evidence of the previous BIG BANG and experience scientiest have in this area is anyone looking at this being a possible unlimited energy source and freeing us from foreign oil dependence? What is this source of energy?

2007-06-07 05:00:01 · 3 answers · asked by james h 2

2007-06-07 04:57:33 · 6 answers · asked by Alexander 6

Anty-gravitation is not about propelling unit but is about making it weightless in first place and not affected by gravitation... Focus - not propelled...

2007-06-07 04:49:09 · 7 answers · asked by Robert M Mrok (Gloom) 4

There is huge number N of file cabinets,
each cabinet contains huge number K of sealed drawers.

Each cabinet contains exactly one penny in
one of the drawers, and K-1 empty drawers.
All pennies are indistinguishibale.

During earthquake all drawers fell on the floor,
and janitor replaced all the scattered drawers
back into cabinets, each drawer into arbitrary
cabinet, because it was impossible to say
which drawer fell from which cabinet.

In ensemble of identical pennies, what is increase
of entropy per penny?

2007-06-07 04:46:11 · 2 answers · asked by Alexander 6

A clothes line hangs between two poles. No matter how tightly the line is stretched, it always sags a little in the centre. Why?

2007-06-07 04:41:29 · 10 answers · asked by Anonymous

3 lamps are connected in parallel to a 12V battery. The resistance is 8 ohm in each lamp
- Calculate the current drawn by each lamp
- The power disipated by each lamp
- The total energy transformed by the 3 lamps in kilowatt hour when operated for 12 hours

Please help me with this, my physics exam is tomorrow and i don't know how to do this. Thank you!

2007-06-07 03:50:29 · 5 answers · asked by Ryujin 3

if 3 capacitors are in series a 12micro farad, a 8 microfarad and a 24 microfarad.

If the total charge in the system is 24 coulombs,

What is the charge stored by the 8microfarad???

2007-06-07 03:42:41 · 4 answers · asked by Anonymous

I need to build a water rocket. I need step by step directions? If it needs a launch pad i need to know how or what to use? I am using this to present to kindergardeners. So it needs to be safe/.

2007-06-07 03:41:55 · 5 answers · asked by Mikayla Z 1

2007-06-07 03:13:58 · 9 answers · asked by Anonymous

If a guitar string has a fundamental frequency of 500 Hz, what is the frequency of its second harmonic?

250 Hz
750 Hz
1000 Hz
2000 Hz

2007-06-07 03:08:10 · 5 answers · asked by Anonymous

2007-06-07 02:54:49 · 8 answers · asked by Anonymous

We can see only a tiny spectrum of radiation called visible radiation, and not the rest (infrared, gamma, x-rays, etc etc). We can hear only 20 to 20,000 Hz of sound, and not above it (like bats and dogs can). We can smell only a few things and not millions like some animals.
And we base our perception of reality on these in-complete senses. How real is our World? Are we living in a blind mans paradise?

2007-06-07 02:45:11 · 6 answers · asked by Anonymous

2007-06-07 02:24:23 · 7 answers · asked by Anonymous

i have designed an physics experiment as below:
Aim:
The aim of this experiment is to use different shapes of mirrors to reflect the sunlight onto the solar panel, and find out which shape of mirror makes the most efficient solar power of the solar panel.
Apparatus:
A solar panel, Mirrors (maybe shape of circle, triangle, rectangle, ect..), wires, An ammeter
A voltmeter
Method:
1. Set up a circuit to connect the ammeter and voltmeter to the solar panel
2. Put a mirror at 45°angel of the solar panel
3. Record the voltages and currents
4. Put the mirror at 90°of the solar panel
5. Record the voltages and currents
6. Repeat step 5 for different shapes of mirrors
i have 2 problems now:1.if i put the mirrors at different angles,i don't know what angles should be chosen to test(i am afraid i miss the best one)2.i have thought of do one shape of mirror each day,start from 9 am to 4pm(the angle of the sun is changing),i am considering the weather won't be the same every day.what should i do?

2007-06-07 02:06:22 · 4 answers · asked by Anonymous

i know that white things reflect all the spectrum of visible light and transparnt things let it all pass thrugh but if our eyes receve the whole spectrum from each whats the difernce becouse there is no absorbance of light from eather so why do we not see transparnt things a white or white things as transparnt ??

2007-06-07 02:05:43 · 9 answers · asked by Michael D 6

Though my question is stupid, please help me out.........

Why can't I get out of the gravitational potential field without the escape velocity?

2007-06-07 02:00:57 · 10 answers · asked by Anonymous

2007-06-07 01:45:36 · 2 answers · asked by Gypsy Gal 6

such as sound waves? what are the limitations of 'lasering'?

2007-06-07 01:34:45 · 7 answers · asked by paul s 5

Please help by giving complete solution. Its urgent. The answer is 23.33 seconds

2007-06-07 01:25:08 · 4 answers · asked by Rick 1

2007-06-07 01:23:05 · 2 answers · asked by Anonymous

please explain in terms of forces

2007-06-07 01:22:15 · 9 answers · asked by christine 2

2007-06-07 01:19:11 · 10 answers · asked by Eph T 1

Plastic food wrap clings because it is electrostatically charged during manufacture. When you touch something that is electrically charged, it becomes grounded/earthed.

2007-06-07 01:16:22 · 2 answers · asked by Sarah M 1

some body is telling 1 n = 10 kg, and others telling 9.81 kg and some people telling 100kg. confirm which is right

2007-06-07 00:39:46 · 6 answers · asked by samurai 1

2007-06-07 00:08:49 · 4 answers · asked by Anonymous

If the formula for friction is
µR, where µ is the coefficient of friction and R is the reaction due to gravity (actually it is the same value as gravity with the direction reversed).
Where does having more surface area help in a better value of friction and hence a better grip.

2007-06-06 23:47:31 · 4 answers · asked by Anonymous

One can argue that colors really do not exist but it is a pseudo image formed by our brain for a certain frequency of light.
For all you know what I see as green you may be seeing as blue.

2007-06-06 23:33:23 · 9 answers · asked by Anonymous

2007-06-06 23:13:01 · 8 answers · asked by Aneudy 1

In the EDS system, a propulsion magnet lies on the guideway below the train. The train also has superconducting materials. It is said that the train is initially levitated by establishing a current through the superconductor which induce eddy currents in the coils of the rail track, repeling each other to produce levitation. However, once this occurs, how does the train move forwards. How does the propulsion magnet move the train forwards?

2007-06-06 23:04:41 · 2 answers · asked by polyspaston 1

2007-06-06 22:52:52 · 4 answers · asked by goring 6