Physics

Hi folks, I found this flash file as I was trying to visualize frequency. The more I increase the frequency, the longer the waveform gets. How is this possible? Shouldn't the wave get smaller and smaller as the frequency gets higher and higher? I'm talking about the second file on the page. It it broken? How is it possible that as I increase the frequency of the dial, the frequency declines....? http://www.livephysics.com/forums/viewtopic.php?t=6 I hope it's OK that I posted a link to another site, I just don't know how to import Flash onto here. As you can see, the post is from 2006, so I'm not trying to advertise anything! Thanks!

As I understand it, the speed of light can be infinitely approached but doing so requires enormous amounts of energy-input for relatively little speed-gains. So, to give a clear but surely inaccurate example, accelerating from 0.85C to 0.95C may require less energy than acceleration from 0.95C to 0.98C (apologies if this isn't accurate examples, but you get my point). So my question is when something is accelerating at relativistic speed with decreasing speed-gain, doesn't the energy still have to be conserved? So does that energy get released as the particle or object decelerates a relatively small amount from near-C speed? If so, is or could this be related to the c…

If an Atom is kept away from any form of external influence then how long it will live ? forever ?

My Dad told me long ago about Soviet soldiers jumping off an airplane without a parachute onto snow. Now I wonder whether it is true or not. This website collected some accounts of the supposed jumps, and concludes they are probably propaganda or exaggerations. It also examines some physics, but I don't think it's a very good analysis. They seem to be calculating using the maximum velocity but calculating as though the fall angle were straight down. So here is my proposed scenario: an airplane with a stall speed of either 40 mph or 100 mph. Snow 1 m deep, no more, with a reasonable density and compressibility. Suitable but reasonably possible terrain. Can the jump be …

What are your favorite physics books? If you had to pick the greatest physics read of all time, what would that book be?

So, i currently understand that it is best described as waves traveling through space. What i can't visualize mentally yet is how these waves travel from one atom to the next. What are the physics involved in these interactions? The other day i was observing light source from my flash light, an 90 lumines one. I stuck it to my belly and several body parts and noticed how a small portion of the skin was lit with a reddish color. I figured it came from the numerous blood cells in it. But the light could only interact with a limited amount of skin, so i concluded it has to have some sort of "friction" reducing the travel distance until it was zero. Any help?

Hi all, I'm new to the forum and I'd like to thank everyone in advance for any assistance they may give. I''m currently working as a reseach & design engineer for a capacitor manufacturer, but I'm fairly new to the job. I need some help with the thermal coefficient of unreinforced polybutylene terephthalate. The data sheet gives 2 ratings, 63 E-6/K (parallel) and 77 E-6k (normla) Does any know the difference between the two ratings? I would also like to know how to interpret this information. If I want to find out how much the material is going to expand at a certain temp, how do I use these figures. I've tried wikipedia but it's all a bit o…

I need to stop an electric current without breaking the circuit; like turning off a flashlight remotely without touching it in any way. Is that possible?

As I understand it, air at 70F has heat-energy in the form of kinetic motion of the air molecules but it also emits radiation as a black-body according to its temperature. My question is whether the distribution of energy expressed as one or the other form varies and if so what factors influence more radiation or more kinetic transfer. I would guess that dry air sparks more easily from static electricity because the current that "jumps" into the air is more insulated and therefore creates an intense temperature spike in a relatively small area (is this correct, btw?). So I would think that factors like friction of currents in the gas or liquid would make a difference, …

Well, I've been thinking recently about the fact that I was always told that glass was a supercooled liquid. So I went online to do some research of my own and turned up with a conclusion that people still have no clue what glass really is. Also, all these terms like glass transition and some things about transistion phases. I'd really like some help in clearing up the mess about glass, and some explainantions. And maybe some conclusions and opinions of yours. Thanks guys.

In mathematics, the shortest path between any two points is the straight line ... But in physics, a friend told me that the shortest path between two points in space is Zero, Is it true ?.. and how is that possible ??

consider a set up where you have a single electrode in contact with for example salt water. then you have an insulating coating over a metal plate on one surface of the liquid such that it acts as a capacitor. so when an AC voltage is applied you have current flowing into and out of the salt solution so surely electrolysis can occur? diagram at link (crudely drawn on paint). just a curiosity. http://img3.imagesha...ectrolysis.jpg/

Is there any reason why a battery couldn't be charged by a simple hand powered electrostatic generator such as a Whimhurst machine?

Hello everyone, Why does the velocity of flow decreases as the cross-sectional area of a tube increases. If a tube was constricted for sometime, its flow rate would be low due to resistance, now if you dilate the tube, the flow rate should increase. Am I confusing flow rate with velocity of flow. When they say velocity of flow do they mean, that when you dilate the tube more particles travel slower, but since there are more particles flow rate would be high. Thanks

Is there any theory explaining why 299,792,458 m/s is the speed at which an object with no mass travels, or why there is a limit at all?

I've heard it's impossible to accelerate an object to the speed of light. I've heard this is because the amount of fuel (in this example, hydrogen fuel) required would outweigh all the hydrogen fuel available in the universe. Okay, but what say, if you weren't actually trying to reach the speed of light..just getting as close as possible to it. And what say if you had a fuel (and propulsion system) with a bit more of a kick, say something like an anti-matter nuclear fusion hybrid..or whatever. Now, I'm not an expert of course. I'm barely an amateur. So I'm gonna hope that someone who really knows their stuff will step in here and fill in the gaps. First of all, I assu…

So i just had a physics exam the other day, and we were learning about forces and frictions While i was walking back home from school , I wondered how much more energy am i using because of walking in snow than just walking on normal dry ground (pavement) But i don't know where to get all the Mew K for friction between by shoes and snow/pavement and energy i spend for every step i take Can somebody give me ideas on how to calculate this?

and does all electromagnetic waves have the same amplitude?

I am trying to measure the amounts of voltages that I can get out of dry bones due to their piezoelectric properties. (basically I place the bones in between two copper metal plates with wires taped to the top and bottom of the plates). The problems I encountered was that even without releasing much stresses onto the metal plate i can still get a voltages reading and that number just stay there without me doing anything. And when my hands kind of touches it again, the voltages increased. I went to ask someone and they told me that it might be the static electricity that were built on my hand and that I should touch a metal material before doing the experiment. I did, and …

Hello Do Lines of magnetic flux have weight ?? I have this question this photo I drew it there is a Circuit with a coil >> there is a sensitive balance with a ball of wrought Iron The question is What will happen to the balance's reading when the current is in the direction in the picture ?? And what will happen If we made the current in the opposing direction ?? Thanks in advance

Hello, I need to know what linear acceleration and angular acceleration of head is. This is not for physics, this is what I'm thinking, if I'm wrong please correct me and tell my why not Shaking head-angular acceleration Tilting head back- angular acceleration (Just in case this becomes linear, why? angle is changing right?) Nodding your head-angular accleration Moving your head back and forth, in a straight line- linear acceleration Thanks

Hello If we have a coil >> and then moved a Cylinder of wrought Iron in it >>we now that the magnetic field inside this coil will parallel the axis And so the Angle between the magnetic field and the movement direction would be Zero (wouldn't it? ) Would there be a current in the cylinder ?? I mean Eddy current Thanks in advance

I got this from Youtube ( she was so funny LOL ) ---->

There are two protons in the room temperature. They have repulsion force each other. Between them no fusion reaction occur. If we only consider proton as particle, how much force is required for attaching them each other?

Is the electron a power or a matter ? .... I'm looking forward to see your answers for this question thanks in advance