Effects Definition and 963 Threads

Hi everyone, I'm working on random materials which are coincidencely oxides and showing semiconductor behaviour... Some of these are metals and i suddenly realize MOS (which are practically everywhere). I know them, i know how they work and behave still i can't get to understand the effect of...

How does lightning cause a voltage spike? Is it the changing magnetic field caused by the lightning current that induces an emf in the power lines, or are electric charges deposited on the actual lines (like a battery pushing charges). Is it possible for the emf of the lightning to cancel the...

According to Einstein's General relativity, gravity is known as a curvature of space-time fabric. I watched a video clip on youtube and it said that gravity is not really a force but a shape of space and time. Then here comes a question-if gravity is not a force and just a curvature of fabric of...

My Achilles Heel has always been motivation. I was wondering if taking nootropics is a viable solution. Are there any (general) side effects?

Homework Statement A sound goes up one octave, from 256 Hz to 512 Hz. What happens to the, period, frequency, amplitude, pitch, and speed? (choices are increase decrease or stay same) Why? Homework Equations N/A The Attempt at a Solution N/A

1. Suppose that Cepheids did not exist and there were no other standard candle technique that worked at the same distances. Which statement would be true? a. We would not be able to measure the distances of distant galaxies. b. We would still be able to measure the distances of distant...

Considering that most of the planets are opposite to us, excluding Saturn and Pluto, could that have anything to do with major earthqauke in the last couple of years? Just a thought.

I was wondering how waves of the non-ionizing part of the electromagnetic spectrum differ from each other besides mere frequency and more specifically with respect to possible biological effects. How does exposure of a human or other organism to for example radiation from visible light differ to...

It has occurred to me from the statements in various threads that I may be misunderstanding the effects of dark matter, so I'd like someone to either verify that I DO in fact have it right, or that I am mistaken. MY understanding is that dark matter: (1) has a gravitational effect on...

how does salt turned into an engine affect?

1. why does gas expand to fill a container when there is no increase in temperature or any force applied to it? ( I am confused with the rising effect of gas in air and the expanding effect. how can we distinguis it?) 2. how can we determine the limitation of gas expansion when there is no...

Hello, In the design of electromagnets, why does the length of the solenoid matter? The magnetic field inside a solenoid, given by B = \mu n I , depends only on n, the number of turns per unit length, and not on the length itself. I know that the equation above applies only to the case...

I have 2 gyroscopes that are aligned on a common plane. The first one is larger than the second and the second resides inside the first. The first one is proportionately less dense to account for it's size and therefore, both discs have the same kinetic energy. Also both gyroscopes are attached...

Not long ago I was arguing with someone on the Internet (where everyone is wrong) about impact of quantum effects on macro scale objects. Imagine ice-hockey table (one with almost no friction) with number of pucks on it. If you'll hit one of them it is safe to say that pucks' paths are very...

Sorry if I sound amateur, but I am. I've recently been wondering about the effects of speed on time dilation. I have read that the closer you get to the speed of light, the greater the effects are. I know that movement is relative, and speed is defined by the observer (I think). So I was...

I was wondering why it is when you use the electricity from an electrical generator, it bogs the generator down? Shouldn't the draw off of electricity negate any sort of back flow there by making it easier on the generator to function?

I have a question about of light waves. Moving at high speeds toward or away from visible light could be the difference of experiencing that light as violet or red. Of course this experience is due to the photoreceptors in the eye seemingly experiencing a shorter or longer wavelength. My...

Hey, my first post on here, just wanted to ask how to calculate the effect of a motor, and a switching current in the wires supplying the power on the surrounding electronics. The two motors will be supplied a PWM signal of 20Khz frequency, 5amp, 7v2 at 80% duty cycle. This is part of a...

i saw in car batteries in electric vehicles one can get more cycles (discharging them and recharging them) if one does not discharge it all the way. ie, its better to charge often even when it does not need them. but i had heard that for my phone battery it was better leave it charge all the way...

I have a question about using NA (naturally aspirated) intake plenums on turbo charged cars and the detrimental effects it may have. Here is a standard NA plenum for an rb30 engine Here is a turbo plenum for an rb30 engine The difference is with the turbo one the plenum (large...

if the Earth stops rotating , what will happen to the apparent value of g on its surface ?

FYI - Consolidated Guidance: 10 CFR Part 20 — Standards for Protection Against Radiation (NUREG-1736) http://www.nrc.gov/reading-rm/doc-collections/nuregs/staff/sr1736/ I expect there are lots of questions about radiation effects and radation protection. So please post questions or...

More specifically, on acetylsalicylic acid (both crude/made in class, and commercial/store-bought), and salicylic acid. Please hang with me, I'll get to my question in a second. I did these tests: Crude aspirin w/ iron (III): Translucent, light peach in colour Crude aspirin w/ iodine...

What do grad school acceptance committees think about withdraws on a transcript? I'm taking elementary linear algebra just for fun (not required at all) but I find that my physics coursework has a near monopoly on my time. I would really like to withdraw and focus on E&M, modern physics...

Homework Statement Homework Equations What happens if you take into consideration the mass of the pulley, the mass of the string, and the force of friction between the string and the pulley when you are doing a Fletcher's trolley question? The Attempt at a Solution i know that by taking...

I have an assignment on movie magic in which I have to pick a scene from a movie and analyse the physics (including calculations of physics in movie, description and calculations of correct physics etc.) Problem is, I haven't picked a movie yet :frown: I was going to pick 2 different scenes...

When we connect a wire to a negative side of the battery, electrons flow from the negative terminal to the wire in order to make the electric potential same. That only happens for a short period.(the other side of the wire is loose) Having said that, what would happen if we connect just one...

arXiv:1101.4890 (cross-list from gr-qc) [pdf, ps, other] Title: On the quantitative interpretation of dark energy by quantum effect of gravity and experimental scheme with atom interferometer II: the inclusion of general relativity Authors: Hongwei Xiong Comments: 18 pages, 3 figures...

Can anyone tell me the physical law which is behind certain physical effects? 1. Resonance 2. Adhesion 3. Heat strain 4. Lever effect 5. Surface tension 6. Cutting/Bending 7. Evaporation 8. sublimation 9. Weissenburg effect 10. Torsion It would be really helpful for my research...

1. A tire of an automobile has a gauge pressure of 30 psi at the top of a mountain, and the air temperature inside the tire is 300K. The atmospheric pressure at the top of the mountain is 1.7 atm. The car is driven down to sea level, where the atmospheric pressure is 1.0 atm and the air inside...

First let me apologize for asking these questions. So much has been devoted to discussing the expansion of space both on the internet in general and this forum that the answers to my question are probably out there, but there is a lot to wade through. A lot. I found this forum and thought...

I'm only talking about galaxies far enough away where the only significant motion between us and them is caused by the expansion of space itself. When we look at a faraway galaxy, does it appear to be as far away to us as it was at the time it emitted the light that we're seeing? Or does it...

Homework Statement The experiment we did was pretty basic, it was a copper box with five different metal rods (unlagged and of equal lengths and diameter) welded onto the bottom, on the bottom of each were pins stuck with petroleum jelly. Hot water was then added to the box and the order at...

What exactly in the photoelectric and Compton effects can't be explained with the wave model of radiation? For instance in the photoelectric effect, why the fact that the energy of the electrons emited from a material after being subjected to certain radiation depends only on the frequency of...

Homework Statement What effects occur on a conductor within a circuit, for example copper wires - what can effect them and what can be done to control the effect? Homework Equations None The Attempt at a Solution I have no real understanding of electrics but one attempt is...

Does a mass in rotation exert a different effect gravitationally than the same mass at rest? I recall it does. As a thought experiment can we take a dense, small mass and place it in extreme rotation so that it's effect on the local gravational field is intensified? This thought experiment...

i wanted to say hi and i have a couple questions. I'm letting everyone know that i have the electrical understanding of a basic beginner. first question: what are the effects of a voltage multiplier on amperage? second question: is there an amperage multiplier? thanks.

The famous double-slit-experiment has been widely discussed just about everywhere, but I'm wondering about seeing wave-particle duality with a single-slit experiment. This experiment would consist of a source of particles, a screen with a single slit, and a second screen with some sort of...

Hi there... My question is that when nucleon's loses energy (such as in fusion),does that affect their size as well? do they also shrink or grow by losing or gaining energy?

Hi all! I'm doing a statistical mechanics class this semester where very often questions like "consider the limit of temperature going to..." pop up. Now, if you consider a relativistic system (say some gas), to what extent does it make sense to talk about temperature going to 0? [to me...

Hey, I was wondering what were would happen to the fluid flow or if this would cause any structural problems to the following case. A vertical pipe of 150mm diameter and roughly 3 metres in length is at the bottom of a large tank. At the bottom of the pipe is a coupling which leads to...

I know someone whose life has been badly affected because his father is a drunkard. That is one the reasons I'm against alcohol because I've seen it with my own eyes how it affects others' lives. There are too many accidents because people drive while drunk. Many other crimes also stem out of...

Maybe this should be posted in biology but it seems more like an electricity question to me: I've read that static electricity increases in the cold because of lower relative humidity. This seems to mean that it is more difficult for things to dissipate/ground their electric charge to the...

hi, I am confused about how the vapor pressure affects the materials growth. Can someone comment on the following : If the vapor pressure of a precursor, let's say N, is high then it will be hard to grow a material containing N because it will be hard to incorporate it onto the substrate...

Hi, To understand the difference between uniform magnetic fields and field gradients would it help to make comparisons between their effects on different particles? The posts on Stern-Gelach shed some light here. For instance, what effect would a homogeneous and an inhomogeneous magnetic field...

Diffraction is obviously a limiting constraint on high-precision imaging instruments. But is it possible, given a known aperture shape, to remove the diffraction caused by that aperture? At this point, I know that the diffraction pattern of an aperture or slide film brought to rear focus is...

Questions Polonium-210 has a half life of 138.4 days. It decays to stable Pb-206 by emitting an alpha particle with a kinetic energy of 5.31 MeV. Alpha radiation of this energy has a relative biological effectiveness of 20. a) If the difference in mass of Po-210 and Pb-206 nuclei is...

hi, let's suppose 2 electrons are far away each other and therefore they interact very weakly. i wonder if in such case there are as many virtual photons in the case they are very close to each other? because i know that only 1 electron in complete vacuum generates an electromagnetic field and...

Here's my issue. We will say that from our reference Object A is stationary and Object B is moving. Object A witnesses Object B traveling 6/7 the speed of light, thus Object B's "onboard clock" is running half as fast as Object A's, though it appears normal to Object B. If Object B does...

At what length scale do quantum effects become important in gravitational calculations??