Physics - August 2007

What is entropy. Ive read my phisics book and looked at videoes and im still lost. Im supposed to write 10 pages on this.

2007-08-02 12:48:36 · 10 answers · asked by Anonymous

I'm also posting this in A & S and mathematics.

There are four combinations. I know what finite and bounded means. I know what infinite and unbounded means. But could you give me some examples of the other two? Some explanation would be helpful as well. Thanks.

2007-08-02 10:45:37 · 2 answers · asked by Brant 7

A uniform disk of mass .11 kg and radius 21 cm is constrained to rotate on an axis about its center. Friction exerts a net torque of .0252 meter Newtons on the system when it is in motion. On the disk are mounted masses of 25 grams at a distance of 17.64 cm from the center, 10 grams data distance of 8.82 cm from the center and 50 grams at a distance of 5.04 cm from the center. A uniform force of .6 Newtons is applied at the rim of the disk in a direction tangent to the disk. The force is applied for 4 seconds with the disk initially at rest.

What is the KE?
At the system's final angular velocity what is the speed and KE of each of the masses mounted on the disk?

I need someone to walk me through this...not really looking for just an answer.

2007-08-02 10:26:48 · 1 answers · asked by benzene boy 1

-40 C and -40 F are equal, but what temperature are Fahrenheit and Kelvin the same?

2007-08-02 10:18:41 · 7 answers · asked by Anonymous

i have been tested & i was like 62%right & then 38% left

can any1 tell me what that means ???

2007-08-02 09:02:59 · 4 answers · asked by Anonymous

We know the speed of light.
Does darkness have a corresponding "speed"?

2007-08-02 08:10:44 · 5 answers · asked by swordfish 2

2007-08-02 08:08:13 · 3 answers · asked by Anonymous

2007-08-02 07:53:01 · 6 answers · asked by davidsz9 2

For an electro-magnetic wave travelling in the y direction, when B points in the x-direction what should be the direction of E?

a) positive z
b) negative z
c) positive y
d) negative y
e) positive x
f) negative x

2007-08-02 07:10:04 · 4 answers · asked by dwa9@sbcglobal.net 1

I have read that it is claimed that nothing can travel faster than light (except money out of my wallet!). Is there a simple explanation that a non scientist like me can understand why that should be so? It sounds rather like, for example, someone three hundred years ago saying "no one will ever travel at over 1,000mph", simply because the technology did not exist at that time.

2007-08-02 06:49:14 · 17 answers · asked by Pershore 2

A car with locked wheels stops in a distance D on a dry pavement. If the pavement is icy, so that the coefficient of how far (in terms of D) will this car travel before stopping if it started with the same initial velocity in both cases?

Answer: 8D

This equation can help solve the problem: V^2=Vo^2 - 2a(delta)x

how do I work out this problem?

2007-08-02 06:22:30 · 4 answers · asked by Cheat Sum 4

2007-08-02 06:08:41 · 3 answers · asked by sameerteacher01 1

My husband and I have been arguing about this. He keeps turning off the light in the room I am in, saying that the lightbulb is making the room hot. I know they emit heat, but enough degrees to actually feel a difference? It is a 60watt bulb in a 250 sq foot room.

2007-08-02 05:31:03 · 12 answers · asked by nikkisekstal 2

If there is some fundamental randomness, is there a lot or only very little? This may perhaps be answered in terms of the brain physiology, but I will also be glad to have answers that take into account our day-to-day experience. Smell, color, sound, taste and touch create a representation in the mind of the classical world. Thoughts are like internal sounds or images. It seems to be all classical. So, I tend to believe that thoughts are totally classical objects. I am interested into this question in the context of free will and determinism. Any opinion is welcome.

2007-08-02 04:37:54 · 3 answers · asked by My account has been compromised 2

Figure 1 shows a specially constructed tank, containing a layer of air at the bottom, a layer of glass and a layer of water on top. A light source is immersed in the water.
The beam of light is rotated to a certain angle of incidence, as such it no longer passes through the whole container. Explain the phenomenon that casues this to happen and calculate the angle of incidence (theta t) at which this occurs.

So i have water on the top with refractive index of 1.33, below this i have glass with a refractive index of 1.52, and below that air with a refractive index of 1.00. The phenomenon that causes this to happen is called total internal reflection, i've already figured that bit out. I also have the critical angle of 38.1 degrees, so in the second medium, glass, the beam of light is at an angle of 38.1 degrees to the normal. I need to find the angle of incidence that the light beam is when it's going through the water.
Any help would be appreciated.

2007-08-02 03:37:02 · 1 answers · asked by David M 1

Contrary to what is read in the comic books being struck by lightning, falling into a vat of radioactive waste or being bitten by a radioactive spider is not the best thing in the world which can happen to you.

Having said this, is it plausible in our real non-fictional word to suggest or even prove that we human beings can possess powers comparable to that of fictional super heroes?

2007-08-02 03:33:16 · 6 answers · asked by BlueYonder 1

If the weak force is meant to go about changing the flavours of fundamental particles, then what exactly is the point of the neutral Z boson?

2007-08-02 03:25:35 · 2 answers · asked by Anonymous

explain fully to earn maximum point!

2007-08-02 03:13:42 · 4 answers · asked by Emperor 3

I have a toyota 4runner and i usually drive with my driver side window down and also the window that's on the trunk.
Whenever I drive...there's a breeze shooting up from the trunk. Shouldn't the air that comes from my driver side window flow through the back window and go outside instead of being reflected back up the front of the car?

2007-08-02 03:07:24 · 4 answers · asked by Anonymous

2007-08-02 02:36:50 · 14 answers · asked by Gonzino 2

Please, WATCH this video first before you comment:

http://www.youtube.com/watch?v=Qa7PN-8T2VY

Then to learn about what REALLY happened to the Twin
Towers and Building 7, watch "9/11 Mysteries" & "Loose
Change"... don't listen to opinions... see the actual material
evidence for yourself and make your own judgements...

Where did all the bright flashes of light come from?

http://www.youtube.com/watch?v=Qa7PN-8T2VY

2007-08-02 02:32:30 · 6 answers · asked by Anonymous

a man is walking with a speed of 2km/h. the rain apears to him vertically downwards. when he doubles the speed rain apears to him making an angle of 30 with the vertical.find the velocity of rain

2007-08-02 02:09:40 · 7 answers · asked by sameerteacher01 1

2007-08-02 01:30:57 · 2 answers · asked by Lai Yu Zeng 4

2007-08-02 01:24:44 · 6 answers · asked by nightcrawlus 1

to make a model which is simple enough for a 9th standard student . anything which is different from the usuals one's like a fan ,windmill, torchlight or acid based electricity

2007-08-02 00:38:15 · 5 answers · asked by preethinjoa 1

2007-08-02 00:01:02 · 9 answers · asked by Rishubh G 1

2007-08-01 21:23:49 · 16 answers · asked by Brook 1

I really enjoyed reading wikipedia's articles on M-Theory. Now I want to understand a little more about how the p-branes operate, for example, what happens when p-branes collide? Do p-branes exert forces on other p-branes from a distance, or do they have to collide in order to change their movement? Are there any good internet resources I should look at?

2007-08-01 21:11:32 · 1 answers · asked by Michael M 6

It seems to me like it should be possible to understand how the universe works without the need for experimentation. Is there a way to use logic and mathematics to unravel how the universe operates at a fundamental level?
Here is my argument. Is there anything wrong with it?

1. I think (assumption)
2. I exist (based on 1)
3. The universe consists of all objects and phenomena. (definition of universe)
4. I am part of the universe and the universe exists, although I might be the only member. (based on 2 and 3)
5. Fundamental physical laws govern how the universe operates. (assumption)
6. It is impossible to know if my experiences are real or imagined. (assumption)
7. Therefore, the only thing that I can know about the fundamental laws of the universe, are that they form myself. (based on 4, 5 and 6)

2007-08-01 21:04:22 · 4 answers · asked by Michael M 6

Since a single atom is something like 99.999...percent empty space and since the whole Earth is made up of atoms does that mean that the volume occupied by the Earth or any other object is actually 99.9999...percent space and a very very small percent of mass?

2007-08-01 19:55:48 · 8 answers · asked by Bender[OO] 3