Effects Definition and 1000 Threads

hello, 'QUERY3 I think we all know about tunnel effect of quantum, Also when I was studying photoelectric effect, I studied that emission of electrons for a electro-magnteic radiation of frequency less than threshold frequency is quite impossible. But then how can we say that particle having...

I was wondering about something. If a black hole has charge, would it be measureable? Does the electric field escape the black hole even when light cannot? Or if the field does not escape the black hole, how do we know that it's a charged black hole?

Hi all, I'm doing this project entitled "determining the effects of Sulphation on lead-acid batteries", and what it essentially is, is the reason why these batteries lose their effectiveness after being left in a discharged state for a period of time. What happens is lead sulphate is formed...

Hi guys For a science fair project, I am going to test the effects of X-radiation on flash memory. I'm intending to fill a number of 16MB (15,876,096 byte) Compactflash cards with data, hash check the data with hkSFV, expose them to the radiation and hash check again for any data corruption...

Are relativistic effects "real"? At this point i'd like to detour the topic and ask why time is so special that it doesn't come back to its original measurement. After all, once all moving observers are stopped wrt to each other, and they compare their measuring rods, they measure equal. so why...

As you may know allready the Earth's rotation about its orbit is slowing down and the moon is moving farther away from the earth. I believe the figure is about 4cm a year (dont qoute me on this) and it is estimated that in about 3 billion years the the Earth's rotation will have slowed to the...

Homework Statement Within the system of the muon, which relavisitic effect increases the probability for the muon to reach the Earth surface? Length contraction of the distance to Earth. Time dilation of its mean-life. Both of the above. None the above, the probability is lower in the...

Hello, If a magnetic field aligns the electron or nuclear spins can that have a macro effect of causing torque? So for example if we had a rod and we fixed one end but allowed it to freely rotate and then aligned electron or nuclear spins would that cause the rod to rotate? Thanks, Xerxes73

I was doing some reading on the effects of air blasts from asteroid impacts when I realized that I've never seen any data of the potential effect on marine life. Since sound travels farther and faster in a liquid, wouldn't an asteroid impact in a large ocean (liquid) have a more profound...

Homework Statement A strong magnet is placed on the screen of a television set (permanently damaging the tube). Explain the following observations. a) the picture becomes distorted b) the screen is completely dark where the field is strongest Homework Equations none. The Attempt...

Assume 2 massive bodies are moving away from each other at high speed. Since the gravitons which cannot travel at faster than the speed of light, are having a hard time being exchanged by these two bodies, it must be plausible to assume that the gravitational pull between these two bodies...

what is effective mass? and how does it effect both the electrical and optical properties of a crystaline structure?

If the universal gravitational constant was changed from 6.67 X 10^-11 to 6.67 X 10^+11 what would happen? Hi. I am doing a physics project for grade 12 physics. Here is the question: The universal gravitational constant, G, is suddenly changed from 6.67 X 10^-11 Nm^2/kg^2 to 6.67 X 10^+11...

What causes the magnetic force between 2 magnetic poles?

I think I know why we can't time travel backwards. I have been researching like mad at my skool and I think i have the answer. If I'm wrong, PLEASE tell me. This is for a research paper, and I am trying to navigate my way out of the math and stuff: We are in the present, while physical...

I get the photo-electric effect but I am just wandering, is that the only principal on which lasers function? I mean do lasers "cut" materials by ionizing the atoms?

Hello! The question about which oil that is the best to fry in, or to deep-fry in, should be examined, if it hasn't been already. Is it possible to set up a function b_f(T), where b is the "badness" of heating up a certain kind of fat f to temperture T? For example, saturated fat can be...

So I have a couple of cheap <5mw red laser modules. And I also have mirrors. And I'm bored. You can guess what happens next (profit). Some really strange effects that I'd love to know the origin of: 1.) The speckle effect from the laser beams - it doesn't actually matter where your eyes are...

What is coherent length? and how it is affected interference

question: do the effects of relativity that would manifest on objects approaching the speed of light (increasing mass, decreased time, etc) also affect photons? Photons are, after all perhaps the only things that routinely travel at that rate.

Homework Statement A refrigerator is marked 80W and 250 V. What is likely to happen if the voltage falls to 50V? Homework Equations P=V^2/R V=IR The Attempt at a Solution --------------------------------------------------------- R=V^2/P =250*250/80 =781.25 ohm Assuming the...

ok, this is a couple of questions in one where is water stored in your body? i know some is stored in your blood stream, but then does it ever get emptied out and if it does then why are some athletes not allowed to drink a lot of water i heard that they will get to much water in there...

Rough (not smooth) surfaces often appear to be darker in sunlight when they are covered by water.How can we explain this physical phenomen?

(Not Spam :-p) I did a bit of reading today on partial reflection when using ultrasound. I was reading about a pregnancy gel that is applied to the womans stomach when detecting a baby. To put it briefly, if the ultrasound transmitter is held away from the body a lot of energy is reflected...

Hello everyone, I have a question about the tension effect of spreading out a slit web over a short distance. We are installing a web cleaner that requires 40 - 3/8" or 5/8" slits be brought through it with a short distance between one another. I've designed a shaft that will keep each...

Can viruses be used to diminish the effects of genes? My friend said they couldn't be because we didn't understand enough about the mechanisms behind viruses and she gave some other reasons...but she was in a hurry and she might not have understood what i was asking...so I was wondering if a...

Hello all, I hope I'm posting in the right sub-forum here, because I'm quite new and don't really know my way around yet. Not to mention that the topic encompasses quite a few different areas. The subject is nukes in space. Or more specifically, the visual effects they should produce...

I stumbled upon this and have some doubts. First let me explain what is Earth Hour On 31 March 2007, 2.2 million people and 2100 Sydney businesses turned off their lights for one hour – Earth Hour and they are planning another one in 2008 http://www.earthhour.org/" I understand the...

Now according to special relativity when in the case of two people traveling at different speeds have their own clocks running differently depending on their velocity I have understood the theoritical part of this that as c=d/t and as d= space and t= time and c= velocity of light . thus...

When an object, such as a wheel, rolls across a surface, static friction allows it to move. When taking into account rotational motion accompanied by translational motion across such a surface, what effect does static friction have on it other than allowing the object to move...

Q:can anyone explain heating effect E=I2Rt? and heating effect in a resistor?

A battery charger which works from the 240 V mains supply contains a transformer which provides an output of 15 V. What is the number of turns on the secondary coil if there are 6400 turns on the primary coil of the transformer?

When an air passes over the wingtip of the airfoil, the upwash created at the leading edge 'reduces' the Angle of Attack, thus reducing lift. So why does this affect increase induced drag. The way I understand it, the greater the AoA (more lift), the more induced drag that is generated. Help...

1. Suppose a freely orienting chain with 1000 segments each of length 7 AO is subjected to a force on its ends of 10-5 N. What will be the average separation of the chain ends? 2. How large a force is needed to elongate the following piece of polymer to a length of 2.54 cm? Original length =...

Hello all - New to the forums so let me start by saying hi to everyone. ;) Something has always bugged me about considering entanglement effects as "instantaneous." As we all know from SR, moving observers do not agree on simultaneity between two space-separated events. If we...

[SOLVED] Relativistic Effects in the magnetic field of a synchroton The Question is about the magnetic field which is needed to keep electrons in uniform circular movement (UCM) when their speed is not negligible compared with the speed of light. If we ignore relativistic effects, magnetic...

This Question is about the magnetic field which is needed to keep electrons in uniform circular movement (UCM) when their speed is not negligible compared with the speed of light. If we ignore relativistic effects, magnetic field will take the following value: B = (v*m)/(r*q) Where...

Do higher wavelength radiation have more pronounced diffraction effects than low wavelength radiation, and why is that?

There is a point b/t the Earth and the Moon where the gravitational effects of the 2 bodies balance each other. How far apart from the center of the Earth is this point? Answer: x = 3.44 x 10^8 m (from the earth) or 3.82 x 10^7 m (from the moon). I have no clue what to do. I assume you would...

Hi, having trouble finding detailed experimental evidence to support some conceptual illustration work I am undertaking to describe a manned orbital habitat in LEO, that can function as a long-term maintenance centre. A draft schematic of the current idea can be found here...

theres a problem in wheeler's spacetime physics (exercise 2-9) which goes like this : you are in a horizontal railway coach launched upwards from the surface of the earth. there are two ball bearing at opposite ends of the coach. can you distinguish whether the coach is rising or falling by...

Homework Statement this is a picture of an example from the book. I am going off of it to solve a problem that will be on my test tomorrow. i can figure out how to calculate the shear force and moment of each section (though i don't fully understand it), but I am just not getting how they...

Homework Statement I am to show that quantum effects are negligible in: (i) The diffraction of a tennis ball of mass m=0.1 kg moving at a speed of 0.5 m/s by a window of size 1X1.5 m^2 (ii)The tunneling probability for a marble of mass m=5 g moving at a speed of 10 cm/s against a...

Homework Statement say you have a thermally insulated box which is separated into equal parts by a thermally insulated piston (frictionless) and each part has the same number of molecules and both sides are both at the same initial temperature, pressure, and volume and have the same...

In an attempt to explain space-time curvature and gravity, the analogy of a flat rubber sheet is often used whereas a massive object, such as a bowling ball indents the sheet in the same way that a massive object such as a star creates curvature in space time. Would it be a fair analogy...

Homework Statement A billiard ball (of mass m and radius a) is struck by a cue and moves off with initial speed u, sliding (without rotation) along the table top. After what time will the ball roll rather than skid, if the frictional force between the ball and the table has magnitude qmg...

I've read several posts, but still have some questions; 1) Will electronic devices that are not turned on be effected by the bomb? (ie: TV, Computers, elec. motors) 2) How long after the bomb is activated will the effects last? Surely this is only a short term thing other then the damage...

Few weeks ago a respected magazine brought some excitement with a story on missing bond between Thermodynamics and Relativity. My question is what satisfies the definition of relativistic gas and how would that differ from single star systems with shifted spectra? Take for example...

Suppose i have two clocks on Earth showing 12:00 hours. After, one of the clocks is put in a gps satellite for a year. After one year that clock returns to earth. Due to relativistic effect what time that clock shows? Less than 12:00? If so why?

In a textbook about relativity, I read that particle accelarators can get to a limit because of the relativistic effects. Is that not the limit of speed of light? Thanks for any help.