Physics

I have a project in which i need a generator that can fit in an area of 6"x6"x6". Anyone know a place?

Sorry if this is a poorly worded question. I have something that can spin a rod and I need that rod to be connected to something that can produce power. 1. what can I use to produce the power? 2. where can I get what I need to produce the power? Thank you.

How would someone determine the time it takes a photon to be absorbed and emitted by an atom (the refractive index)? In hydrogen for example.

Hi guys. I'm new here. I've had a good look through the forums and it seems that there are lots on here that really know their stuff. I am embarking on a small project myself. It's an idea that I've had and I would like to develop a prototype as soon as I find all of the neccesary components. I won't go into detail too much yet, but basically I need to find the tiniest rechargable battery/cell that I can. It must be capable of keeping an LED lit for several hours. What's your thoughts. Thanks, Pjl83

Explain to me just about everything, that you guys ca think of, i dont study physics but skateboarding is very interesting, like how does one flip te board and such and still land? haha i know such a random thread, but thats what marijuana does to yah haha

Alright, so today in my science class we attempted to measure the weight of my teacher's 2006 Honda Civic. He claimed that by calculating the surface area of each of the tires, and the PSI in each of the tires, we could find the weight of his car. We used the formula P (Pressure)=F (Force)/A (Area) rearranged for this lab: F=PA Because we only had tire gauges that measured PSI and not Pa, we went with standard units (Inches for length/width, PSI for pressure, lbs for weight). The weight came out to be around 4000lbs, obviously WAY too high for a Honda Civic. The posted weight was 2628lbs. However, the measurements we got could NEVER have worked out because t…

What is the difference between physics and quantum physics? Are there any jobs in the physics field? Know of any good books? I have been studying microbiology and physics on my own for the past year since i cannt afford to go to school full time and the absents of the school that offer majors in that field.

Hi, I was wondering if it is possible to relate the position of an element on the periodic table to the electrical resistance in a wire composed of that element. I have found lots of information on factors affecting resistance, but it's all very basic stuff about length, cross sectional area etc. I would like to know what microscopic properties of wires affect its resistance (e.g. number of valence electrons, atomic mass) and how these properties affect the resistance. Would it be possible to conduct an experiment using wires of different materials to see the impact of these different properties? Thanks

Hey all, My friend asked me to design a couple of simple experiments proving Newtons three laws, so I was wondering if any of you have any cool ideas. Don't consider this homework, it's just ideas I'm interested in. For the first law, I was thinking about rolling a ping pong ball on a table, and then roll it again with something blowing at it. For the second, I was thinking of some kind of motor or such pushing a light object without problem, but having trouble/not being able to push a heavier one. For the third one, I really don't know, I was thinking of showing how a ball bounces, or maybe a balloon propelled by the air expelled from it...? These experiments aren't…

What exactly is ''different time frames''? Does that mean somthing as fast as a bee or a hummingbird sees time at a slower rate than us?

In the case of static electricity discharge, how can I calculate how much energy is given off (i.e., arrives at the recipient side)?

How is the dielectric strength of air affected in reality. Consider dust, humidity, temperature, and air pressure, how much lower or higher does the 3 kV/mm value go?

How does the voltage measured at the surface of a material compare to the voltage that drives electrostatic discharge? I am using the following instrument: http://www.detectortechnologies.com/store/detail.aspx?ID=20 Is it equivalent, meaning is that the voltage that would be needed to overcome the dielectric strength of air and result in a discharge?

i just want to know about tachyons as a layman right from the beginning

I've just been revising fluid mechanics, and noticed a glaring error on the Wikipedia page for the Reynolds number. The person has obtained the Navier Stokes equations using primed dimensionless coordinates and divided by a factor to obtain the Reynolds number R, but has not included S which also should be obtained in front of the partial time derivative of velocity. S is called the Stround, or Stronal number, I'm not sure which. Does anyone know what it's called? That's actually the reason I tried searching on the net in the 1st place! Also, for future reference, how is it one can edit Wikipedia? is it an harder than ordinary Latex?

So I was just wondering what yall think of gravity being the repulsion of matter and non matter (dark matter). Like how hydrophobic interactions pull nonpolar molecules closer together and minimize interaction with water. would this account for the relatively small effect of gravity? let me know what yall think

It was a book on physics that I was reading around 2004 that may have been a few years old then, it started off with subatomic particles and went on through physics to chaos theory. Relativity may have been early in the book. I think it was intended as common man's primer. I read about quarks in there and the cover was black, maybe with a galaxy on the front- possibly a black hole diagram (maybe not). I want to say the guy who wrote it was young-ish. Certainly not Hawking. I know this is not much to go on, but if you have any idea please let me know. Where else could I ask? I've tried physicsforums and abebooks forums. Thanks, Scott

I am new here and this is the first thread I have created but I have a theory. I am starting to believe there is a new state of matter that is way below any temperature anybody has ever created or experienced. I believe there is a fifth state (states including gas, liquid, solid, and plasma) of matter caused by superfreezing matter and turning it into a pile of atoms. So much energy is transferred out of the matter that the bonds that hold the matter together fail. I do not have much evidence to back this theory up, but I am asking the members of this forum to help me with what I am stating.

Suppose I wanted to make a black hole around myself (not fall into one, make one around me), just to see what it was like. Suppose I could move around the insane amounts of matter required to do so. The question is, what would that look like? Below is my proposal for how I might make a 1 light-year radius black hole around me: A total of 6.37 X 1042 kg of matter is required, and must be contained within a radius of 1 light year to form the black hole. See calculation, it uses the Schwarzschild radius equation. In my scenario, I arrange the 6.37 X 1042 kg of matter into little (relatively) spherical masses arranged symmetrically along a larger sphere of radius 1.1…

Does it just exist? Any precise reason? Why is there a magnetic field on earth?

OK, please be gentle, i'm really not good at physics. As i understand it, there's 3 forces: strong, electroweak, and gravity. Other forces, such as magentism, can be described in terms of electroweak (?); i.e., it's not a unique force, rather a different incarnation of electroweak, or something like that. heat is not a unique force, it's just an incarnation of movement (i.e., the amount of movement of the molecules). But, i can't think of what motion is. it's clearly an energy, as it can be converted to/fro the other energies, so if it weren't an energy it'd break the first law; but, i can't see how it could be an arrangement of strong, electroweak and/or grav…

Hi. Why a diamond needle wears out by playing vinyl records ? What is there in vinyl harder than diamond in order to erode it ?

do we have such a unit for energy? and if there was such a unit, what would be its relation with electron volt? I guess they must be equel since they have the same charge but someone said it's 1840 times greater than electron volt.

I need a cool project that explains rotation v's revolution. I have to present this to my teacher and it will be in a science show case. I don't want to do the same thing with the earth and sun ect. I want something differet. I am in the 7th grade and it is an honors class. If anyone has any suggestions I would appreciate it... Thank you : )

As a curious thought, if gravity is really caused by an object causing a dimple in space, then wouldn't the act of lesser mass objects falling into that dimple be in itself gravity in action? Do you see what I mean? Object falls in a hole = gravity. Smaller object falls into dimple around larger object = gravity. So basically, aren't we using gravity to explain gravity?