Effects Definition and 963 Threads

Here's a few smattered questions I've had a hard time finding good answers for: 1. Why is the speed of light a constant? Is it related to the fact that it is massless? Is it because it isn't subject to time dilation? 2. Why is the speed of sound, or EVERYTHING for that matter, not...

I've been searching for some type of equation or explanation of how to find the latency (access time) of a memory system when given the bandwidth, the precharge (refreshing) time between accesses, and how many bytes of data are being transferred... Also I am not sure as to how memory...

why cdw occurs at low dimensional solids with anisotropic fermi surfaces that have prominent nesting vectors?/ what it means : cdws are also common at the surface of solids??where they are more commonly called surface reconstruction or dimerization . PLZ tell me about two dimensional Fermi...

Hi All, Assuming Stokes drag, wikipedia suggests this problem (the solution for v(t) ) has an analytical solution. Is this right? http://en.wikipedia.org/wiki/Drag_%28physics%29#Very_low_Reynolds_numbers.E2.80.94Stokes.27_drag Could someone point me to the derivation online? Or a...

I was just reading R.Feynman's Lectures on physics Vol I and I came across this discussion in which he says that magnetic field results from an electric field i.e relative motion of electrons and so on. Further, he says that the electomagnetic spectrum consists of light waves... The whole...

1.what is the main cause for the emf produced in a thermocouple when their two junctions are at different temperatures? 2.why is it necessary that the emf produced causes the current to pass from the metal (which is at the top of thermoelectric series) to the other metal (which is at lower...

I am working on an animal vocalization study and I need a clarification about acoustic impedance. All of the sources I have gone to are a bit too technical for me, so if you would be so kind to answer my question I would be very grateful! My question is this: What happens to a sound in high...

Hey everyone! How can i learn the basics of electrical engineering? Specifically, I'm interested in building guitar stomp boxes. I've looked at them and random schematics and it can't be THAT hard, at least to copy existing designs. And, although, I really want to get started and get that first...

Supposing we have an RC circuit (see figure) As we increase R, what will happen to the visualized signal of E and V(capacitor) and V(resistor)? And a general question about measuring the (Tao) [the one that equals to RC] BUT FROM THE OSCILLOSCOPE.. They mentioned it is the time for...

In a Black Hole, is gravity the only force drawing matter and energy into it, or deep inside at a minute scale (3 femtometers), is the Strong Force also operant ? Bonus questions: 1) Would it be true to say that without the Strong Force, there would be no matter? 2) In the "splitting of the...

If you apply tremendous force to water and cause extremely high pressure, it should compress and the temperature should go up - but if the heat is given away to the surroundings, does the water temp continually go up to match the surroundings? does the water temp go down underneath the...

I know that light can, because otherwise black holes wouldn't exist. But can sound fall? And are there any effects caused by this. By doing a rough calculation, if sound could fall, sound would have a maximum vertical range of about 5km. Do we see this in real life?

This is my first post and I'll admit I probably don't even know enough to be dangerous. Any how what I have is a a 3' long 6" dia tube that is functioning as a muffler for a boat. It has two 4" dia inlets mounted perpandicular to the length of the tube at 28" on center and two 4" oulets mounted...

Can anybody name 10 effects of light ??

Why does a body accelerate when it experiences a net force? Is there any change in molecular state of the body when it experiences a force?

An electron is enclosed in a large rectangular box. Considering gravity, estimate the order of magnitude of the thickness of the layer that is occupied by the electron at the bottom of the box. I thought about this for a long time and I really have no idea how to proceed. Any thoughts?

Introductory Story (feel free to ignore): In the summer of 2011 I realized my hairline was receding to unmanageable levels even though I had just turned 20. I searched for drug treatments and finasteride came up as clearly the best choice - almost every study showed it was significantly...

Hello. I'm trying to write a book of fiction about a place where there is a moon much bigger than the one we have. The mass is probabbly at least double the one we have here circling earth. It could probably be called a case of double planets. My question is: How would the planet be affected...

At what altitude does a solar panel see a noticeable increase in wattage/cubic meter if it is lifted into the air? I understand the maximum is a bit over 1 kilowatt/meter2 at sea level (not actually converted to usable energy, this is much less and depends on the technology) but that this...

Homework Statement Please go to: http://web.dsbn.edu.on.ca/~andre.huyzers/FOV1-000DC3EC/FOV1-000DC3EE/Lab%20Centripetal%20Force%20.pdf?Plugin=Loft Evaluation Question (E) Homework Equations The Attempt at a Solution Well I was thinking that as the frequency of revolution of...

sorry if this thread is in the wrong place.. basically it's to do with electro magnets.. can you control the strength of them by something like a pedal? as in if you gradually push it the strength gradually increases? also would it be a health risk if you were right next to electromagnets...

I consider myself very well-read on the phenomenon of thin-film interference: how it works, how it's used in lens making, etc. HOWEVER... there's one thing I don't get: Thin-film interference only occurs for one specific wavelength at any given point (according to all the sources I've read)...

I often hear something to the extent of, 1) "despite cosmological expansion, small-bound objects do not expand." and further, 2) "things like galaxies will aways remain bound, and will not expand." Pertaining to 1) Because cosmological expansion is a coordinate property, don't small scale...

Hello I am a first year Mechatronics major (yes its a real major), and currently looking into the effects that magnetic and electric fields have on combustion. I have a few questions. 1) Concerning the electric field effects are the ions carried on the wall that carries the corresponding...

Since we have such a strong magnetic field around the earth, why does it not interfere with smaller magnetic fields we use such as medical equipment, radio wave progagation and other things that creates an magnetic field ?

I'm trying to calculate the heat loss of efficiency due to increasing the mixture of propylene glycol in a heat transfer fluid compared to water.. For this I'm saying that water has a heat transfer efficiency of 100% (relative only) Im looking for multiple data points to create an equation...

In my textbook, it says that impurities lower the melting point and increase the boiling point. But is this only true if the boiling point of the impurity is greater than the boiling point of the solvent, and the melting point is greater than of the solvent too? So essentially, if greater...

Hi all let suppose a charge is in oscillating (e.g antenna),it broadcast wave,and also suppose an observer oscillate , so the observer had saw the charge in fixed distance so we have not magnetic field. what we could say about the energy that the observer recived?

A mathematical statement of energy conservation can be given using the continuity equation in terms of the total energy \frac{\partial}{\partial t}\iiint_V\epsilon dV+\iint_S \epsilon \mathbf{V\cdot dS}=0 where t is time, V is a velocity vector, V is the volume of the system, dS is a point...

Homework Statement I trying to learn general relativity and ran into a few questions while learning about the expansion of the universe. I found a really good intuitive explanation of the expansion of the universe here: http://curious.astro.cornell.edu/question.php?number=274 However...

Since particle accelerators need to be a cyclical structure in order to generate the collisions it has associated to it an angular momentum. Due the conservation of angular momentum we use the rotational kinetic energy of Earth itself to supply them. Take, for example, a particle accelerator...

Not a question from a college course or anything like that, but one of interest to me:) You take a car tyre made of polyester and rubber, the treads are cut to about 7mm deep, the roads coefficient of friction are normally about 0.7 in conjunction with contact of the tyre, if the weight is...

If I had an infinite slab of mass and it had enough mass to become a black hole, would the event horizon be infinitely far away. Because the G field would be the same value at any distance away from the slab.

When dissolved in water, which of the following ions will form stronger ion-dipole bonds with the water molecules? Li+ or Na+? Both have roughly the same charge... Na has greater radius, but I don't see why or how that has any bearing on the problem.

There are two hemispheric magnets, both of them have S on the outer surface and N on the inner surface. If I put them together to form a hollow ball, assuming they are so close that no empty space in the interface, what happens to the magnetic field (inside and outside)? Since magnetic field...

Homework Statement An electron is accelerated through a potential of 10^9 Volts. What is the Energy, Kinetic Energy, and Momentum in the lab reference frame? Homework Equations (1/2)mv^2=eV=1.6E-10 J=1000 MeV The Attempt at a Solution Solving for the kinetic energy gives 1000...

Ket Notation -- Effects of the Projection Operator Homework Statement From Sakurai's Modern Quantum Mechanics (Revised Edition), it is just deriving equation 1.3.12. Homework Equations \begin{eqnarray*}\langle \alpha |\cdot (\sum_{a'}^N |a'\rangle \langle a'|) \cdot|\alpha \rangle...

I would like to know what the effects of a solar flare would be on equiptment used for lunar exploration, say a robot to be specific. What kind effects would this have on the electrical system? I also read a NASA article describing a large solar flare that created a long enduring proton...

Homework Statement Four charges, each q in magnitude, are arranged in a square, two positive and two negative, in opposite corners. The square is L length on each side, and the charges are all in the same plane as shown in the diagram. Show work and units for full credit. q+ -----B----- q-...

I am extremely confused with why time dilation is different from what I've read about traveling at speeds near that of light. I think that I am mixing up two concepts. What I understand is that due to time dilation, both observers would view the other's clock as running slow as long as both...

I have a question regarding second hand smoke and its dangers, I hope this is the right place to post it. I have been told how dangerous second hand cigarette smoke is, I have also been told that it is impossible to fail a urine test due to inhaling second hand MJ smoke. So which is it...

An electrically charged particle has an electric field centred around itself that extends far into space. That field has an energy density proportional to the electric field squared. By Einstein's E=mc^2 that energy density is equivalent to a mass density. Thus, as a charged particle...

Hello, Do current theories of cosmological expansion take into account the effects expanding space would have on a beam of light traveling through space? i.e. if an expanding medium of gas with constant pressure decreases the temperature/velocity of particles, would an expanding medium of...

Since space is a vacuum. And humans breathe out oxygen which will transform into carbon dioxide, would it transform(not really transform, you all know what my reference is)(what does it really do when it leaves our body?)into carbon dioxide and after it is sucked into spaces' vacuum, where does...

Can anyone please describe the reason behind skin effect? All that I have come to know so far is that, due to higher magnetic flux density at the central region of the conductor compared to the region near it's surface, the effective inductance of the conductor is more at its centre and less...

I understand that space is curved inwards by the mass of the planet and I understand how curved space could redirect things towards the planet when they are moving. What is strange to me is the idea that curved space time itself could move me towards the earth. Gravity it seems to me is an...

i learned that we have to consider quantum effects at low temperatures and classical effects at high temperatures but i do not the physics behind it can anyone explain it for me? thanks in advance :)

A capacitor is connected to a HVDC power supply which provides a minimal current. When the volage reaches the capacitor plates the dielectric material in the capacitor polarizes. Now, if there existed a barrier between the dielectric and the capacitor plate the capacitor could theoretically...

My friend tried to tell me that the effects of gravity are instantaneous and I assured him that he was wrong because nothing can move faster than the speed of light. Can someone verify that statement because the discussion got me thinking

This question is in regard to special relativity. From my rudimentary understanding, concerning the twin paradox, if one twin leaves traveling near the speed of light and returns, he will find himself younger than his twin who stayed behind. Hence, the effect of time dilation is permanent...