Physics - December 2006

... entropy. Seriously. Does anybody ever feel nervous that we don't know how to do anything about it? Honestly, we're all on a never-ending slide towards the lowest possible energy state ...

2006-12-08 07:50:09 · 10 answers · asked by Enoki 2

i am looking for an informative, well-written book on astronomy as a gift. the person is a "writer" and loves astronomy. he has already published a book with some information about astronomy within the book. the thing is, a friend of mine, who is extremely knowledgable on astronomy, read the book. he could hardly get through it based upon the extreme lack of understanding of basic astronomy and physics. so, with the person's interest in astronomy to begin with, i wanted to give them an informative book on astronomy. i don't want something that is like a student text book, since this is not appropriate. apparently, the person got much knowledge from the picture books.... hummm.....

any good suggestions?

(i would ask my well-schooled friend, but they are on a trip)

2006-12-08 07:46:32 · 1 answers · asked by christy 6

Basic electricity is part of the course I am studying. Nearly got it but not quite.
I understand that electrons flow, but how? Is it like a knock on effect like dominoes from atom to atom(bad anology I know).
Why is UK 230 V and US 110V. What difference does this make.

2006-12-08 07:21:19 · 11 answers · asked by anthony r 1

2006-12-08 07:19:59 · 6 answers · asked by Anonymous

If I traveled the speed of light and had a flash light with me so when I turned it on would the light comming off the flash light be traviling the same speeed as me or 2X faster that the origianal speed of light ? And would it even be called the speed of light any more?

2006-12-08 07:18:09 · 14 answers · asked by Jnsp52 2

2006-12-08 07:16:51 · 2 answers · asked by ? 2

Couldn't Newton's third law of motion, "for every action an equal and opposite reaction", somewhere down the line eventually be translated to..."for every action, a reason"? Think about it for awhile before answering.

2006-12-08 07:08:06 · 9 answers · asked by __ 3

At as basic level, does the Theory of Relativity say that all matter in the universe is ultimately reduceable to raw energy? I'm no good at physics and have a hard time understanding alot of the explanations.

2006-12-08 06:43:02 · 8 answers · asked by Kurt 2

2006-12-08 06:42:02 · 1 answers · asked by Anonymous

A stone is dropped from the roof of a high building. A second stone is dropped 3.00 s later. How far apart are the stones when the second one has reached a speed of 14.0 m/s?

Basically, I found Vi, Vf, X, A, T for the first stone and for the second stone. For the second stone, I found out at what time it is that the 14m/s velocity is reached. From there, I used basic kinematics formulas and then subtracted the answers, but that also is wrong. can anyone help with equation

2006-12-08 06:40:23 · 8 answers · asked by tigerlilly 2

2006-12-08 06:37:17 · 8 answers · asked by bobby b 1

if two waves with equal amplitudes and wavelenghths travel through a medium in such a way that a particular particle of the medium is at the crest of one wave and at the trough of the other wave at the same time, what will happen to the particle?

2006-12-08 06:36:55 · 3 answers · asked by Anonymous

2006-12-08 06:29:34 · 2 answers · asked by Anonymous

a flying aeroplane experiences loads of forces.....thrust, drag, lift, and weight or gravity. i know that when a plane is cruising, thrust and drag cancel each other out and similarly, lift and weight cancel each other out because both pairs consist of equal and opposite forces.
however, i found out that when a plane is accelerating or decelerating, taking off or landing, it experiences some forces (either thrust, drag, lift, weight or all of them at the same time). I know this must be a very confusing question for people who know a lot about aeroplanes, but i am just a A level student, doing a presentation on fibreglass in which i do this calculation showing that fibreglass is a suitable material for using in the new Airbus A380. i don't have to go so much into the physics of flying aeroplanes so this much information is fine for me.
i calculated the pressure experienced by the plane by Force/Area, does the answer 3.06 kNewtons/m2 seem like a very small pressure on an airbus A380?

2006-12-08 06:28:02 · 4 answers · asked by amandac 3

2006-12-08 06:08:10 · 6 answers · asked by Anonymous

2006-12-08 05:59:11 · 4 answers · asked by coppecoppiloppioppa 2

its true "i know that. but how(exactly) this happens . how each color bend in different angle since all colors will still have the same speed in prism?? plz help . source adress wich have animation would help too? thank you.

2006-12-08 05:56:27 · 6 answers · asked by eina 2

Just got done watching an interesting video on YouTube about Time Travel so it sort of sparked this question.

I've read some Physics books, and watched a movie on Quantum Physics, but the question boils down to this - is time travel possible?

2006-12-08 05:50:46 · 8 answers · asked by Greg S 3

2006-12-08 05:49:20 · 3 answers · asked by eina 2

2006-12-08 05:34:38 · 11 answers · asked by raj 1

Let's say you are standing on a weight-measuring scale inside an elevator: do you think your weight goes up when the elevator goes up and vice-versa?

2006-12-08 05:31:32 · 7 answers · asked by Self Believer 2

2006-12-08 05:15:36 · 21 answers · asked by Ei B 1

1. What is the potential energy of a rock that weighs 100 newtons that is sitting on top of a hill 300 meters high?
2. What is the kinetic energy of a bicycle with a mass of 14 kg traveling at a velocity of 13 m/s?
3. A flower pot weighing 3 newtons is sitting on a windowsill 30 meters from the ground. Is the energy of the flower pot potential or kinetic? How many joules is this?
4. When the flower pot in problem 3 is only 10 meters from the ground, what is its potential energy?
5. How much of the total energy in Problems 3 and 4 has been transformed to kinetic energy?
6. A 1200 kg automobile is traveling at a velocity of 100 m/s. IS its energy potential or kinetic? How much energy does it possess?

2006-12-08 04:55:59 · 2 answers · asked by Red 1

2006-12-08 04:38:50 · 2 answers · asked by WTAT@Q21 1

I have an electric sphere and a certain point out of the sphare.
2 cases:
1.Electric charge is distributed evenly in the volume of the sphere.
2.The same electric charge is evenly distributed in the layer of the sphere.
My question is if the Electric field outside both of these sphares ( which are of the same size) is the same or not. If it is the same then the potential of the point outside these spheres should be the same too.

2006-12-08 04:38:12 · 4 answers · asked by Nooto 1

1.)What is dark matter?

2.)What is dark energy?

3.)How were the heavy elements from iron to uranium made?

4.)Is a new theory of light and matter needed to explain what happens at very high energies and temperatures?

5.)are protons unstable?

6.)What is gravity?

7.)Do neutrinos have mass?

2006-12-08 04:35:54 · 5 answers · asked by Derek B 4

2006-12-08 04:22:48 · 6 answers · asked by x_squared 4

Assume that a fully loaded plane starting from rest has a constant acceleration while moving down a runway. The plane requires .7 miles of runway and a speed of 160 miles per hour in order to lift off. What is the plane's acceleration?

2006-12-08 03:55:18 · 4 answers · asked by Carter 2

2006-12-08 03:41:41 · 3 answers · asked by angel 2

A bowling ball encounters a 0.760-m vertical rise on the way back to the ball rack. Ignore frictional losses and assume that the mass of the ball is distributed uniformly. The translational speed of the ball is 7.83 m/s at the bottom of the rise. Find the translational speed at the top.

2006-12-08 03:31:17 · 3 answers · asked by Amanda R 1