Effects Definition and 963 Threads

Homework Statement Circuit -------------------------------------------------------------------------------- In the circuit shown, the AC voltage source supplies an rms voltage of 147 V at frequency f. The circuit has R = 109 Ω, XL = 212 Ω, and XC = 106 Ω...

What are the effects of Spacetime "Drag"? I have learned that general relativity predicts that a rotating body (such as earth) produces not only a curve in the spacetime continuum, but it also 'drags' spacetime in the direction of rotation. 1) How is this possible? 2) What effects does...

Textbook: "Chemistry" by Silberberg. 5th Edition. Page 306 "Electrostatic effects play a major role in determining the energy states of many-electron atoms." Can someone help me understand this statement? "Electrostatic effects" is not in the textbook glossary, and I'm not having luck...

This is more of a confirmation that I got the facts right: Reading around, I found out that the solar wind travels from the Sun to the Earth at a mean speed of 400km/s. Does this mean that it takes around 4 days for a burst of solar wind to cause disturbances in the Earth's magnetic field...

I have always been confused by SR and GR in terms of what each observer observes of their own frame of reference. e.g. Does an observer moving at a high v/c measure length contraction in their onw F of R? I assume not since all apparatus would be similarly contracted. Nor do they measure...

A parallel plate capacitor of capacitance 10microfarads has the space between filled with material with (dielectric constant k)= 4.0. The capacitor is charged to a potential difference of 2.0V . With the capacitor connected to the battery the dielectric is removed. 1. The capacitance is F...

hi, i have been doing research on the effects of gravity on a pendulum but i still can't seem to find the relationship between the two. what i got so far is that gravity won't stop the pendulum but air resistance and friction would do the job and that gravity will only affect its...

if the motor is already running at a voltage of 410V what would the effects be of reducing the voltage?

Can man-made EM waves produce physical vibrations of objects? Can man-made EM waves vibrate powders like sand or talc? I'm trying to understand if any types of electronic frequencies can cause physical vibrations...thanks.

I was just wondering what the physical interpretation is of 'fine structure effects'? (where alpha is the fine structure constant).

Besides the obvious inefficiency (waste of energy) of a non-matching impedance between the transmission line and the antenna for a RF transmitter circuit, what are the additional effects? Is it safe to say the reflected portion of the signal returning to the source will also cause distortion...

In the electromagnetism theory, the phase factor or constant (usually BETA) in wave propagation for lossy medium has the unit rad/m. I understood that it must be interpreted as the amount of phase shift that occurs as the wave travels one meter. However, differently of the attenuation...

Hello, Recent observations claims that Dark Energy is effecting the expansion of universe and increasing the anisotropy in the cosmic microwave background (CMB). Do you agree?? what about cosmic magnetic field and its effects on the expansion and CMB ? If it is increasing the...

Homework Statement What is the effect of increasing the height of the track on the acceleration of the object? Homework Equations The Attempt at a Solution The speed of the track was slower? is it correcT?thanks

This semester my university has a lot of PhD students that are to afraid to graduate or can't be supported by their professors due to a lack of funding. So because of this there are a lot of PhD students forced to teach this semester. Of course this means that there is a huge flood of TAs this...

I've always heard people say that roaches and similar insects are completely immune to the dangerous effects that radiation has on biological organisms. Although I doubt this is true, I just wanted someone on this forum with the scientific expertise to confirm this.

when two neutron stars collide, do they creat both a balck hole and release gamma rays or does it happen in stages?

Hi all, I am curious about the effect of long term drawing/sketching/painting on the brain. Is there any serious work being done on this topic? Would be good if someone direct me to some journal articles on this. Thanks

A recent paper says that Alcubierre's warp drive probably won't work due to quantum effects: http://www.technologyreview.com/blog/arxiv/23292/ -- nontechnical summary http://arxiv.org/abs/0904.0141 -- paper Speaking as a non-specialist, it seems hard to tell which predictions about the...

I'm looking over some common physics equations as a review for the course I'll be taking next semester, and for each equation, I'm coming across two equations for each, a relativistic and a non relativistic. The class I'll be taking will be on mechanics, inertia, etc., so I figure I'll only...

Hi, I was wondering how to calculate a rough estimate of the temperature at which quantum effects begin to become important for a gas of interacting particles. Let's say the particles interact via a spherically symmetric potential with an equilibrium distance R and a well-depth E (such as the...

hello! 1st year college physics student here. has anyone thought of the effects of time on particles traveling 99.999999% C in a synchrotron? for as it has been explained to me, when something approaches the speed of light, time for the particle slows incredibly (but of course to the...

I read that you can't directly measurethe direction of spinfor asingleelectron, but you can preforman experiment to see if two electrons are "spinning the same way" or "opposite ways". I know electron spin isn't like normal spinning. Let's say we have two pairs of electrons, each pair close...

Observable QG effects in Chern-Simons gravity--Stephon Alexander Important talk, http://pirsa.org/09110132/

I was doing research on faster than light travel and a question popped into my head: what would be the side effects of faster than light speed travel? Any ideas?

I want to Commercialize Science: just not discover it: Effects of Career Choice I am in need of my major advice. My father is a Political Scientist and Economist, and he has personally wrote on current and future political and economical tyrannies. He sees the formation of a much more...

The electron pairs, acting as bosons, all fall to the lowest energy state, and can't get enough energy (under normal operating conditions), to make the quantum jump to the next energy level, hence as they move through the conductor they don't lose energy. That is, in a nutshell, my assumptions...

In a recently released computer game there is a scene where a nuclear bomb goes off in space over the active war zone on the east USA coast (too high for anything but EMP). Moments later, it starts raining helicopters and everything that uses electricity, from lights to laser sights goes out...

Hi, If we had two junctions one side with Nd=1016 & another side with Nd=1015 put together. What happens in such a junction? Would we see electron diffusion from the high donor concentration side to the lower concentration side? What should the band diagram of the junction look like...

My first thread here. Please bear with my lack of knowledge. I talked to a physics grad student about whether it's fair to describe QM as a theory applied only to microscopic objects. Although the definition of "fair" is ambiguous, at least he told me that, from his understanding, he wouldn't...

I have done a lab sesion on hall effect. There a few points that still doubted me. 1)Why are holes considered positive charges? 2)The effects of spread in carriers velociity are assumed negligible in my lab session, how will it affect my Hall coefficient if they are not negligible. It will...

A piece of Semiconductor is irradiated by light, will the light effects on resistivity be intensified or reduced if the temprature is increased? why?

Hi All, how is the age of universe calculated ? i read a few articles/wiki etc and its estimated to be roughly 13.7 billion yrs old. Have we considered the time dilation effect here ? cause we are measuring the electro magnetic radiation traveling in an expanding universe and in an...

Hi everybody, I am searching for a project and I need help. Last year I realized that the trees which are around carpenters shops' have bigger fruits than the others. I am searching about it. Can the Iron which comes from waste neils and screws affect the soil's mineral ratios? How can they...

What are the physical possiblities if the ,astroid Toutatis , crosses directly between the moon and Earth on December 12th 2012. I understand that this is a fairly large astroid and is projected to zoom near Earth somewhere in the range of the distance between Earth and the moon. What are the...

I was just re-reading some of Hawking's writings, and apparently he is fairly stong supporter of a quantum theory of gravity, as opposed to GR, and writes extensively about gravitons. this brought up a question for me which perhaps one of you can help clarify. classical gravity indicates...

I was trying this mental exercise and I need help and confirmations... so please launch your comments Imagine (as an assumption) that the surface of the Earth is completely flat with no disturbances. A perfect sphere. Imagine that is possible to build a solid ring made of a completely...

"The Planck length is the scale at which classical ideas about gravity and space-time cease to be valid, and quantum effects dominate. This is the ‘quantum of length’, the smallest measurement of length with any meaning." What I am wondering about this description is the word "dominate"...

hi all. I am doing an experiment that's involvse measureing the speed of sound through fluids at different temperatures and i want to able to predict the speeds before the experiment using equations. what i have found so far is that the speed of sound in a fluid,c, is equal to the sqaure root...

I have a few questions on the Photoelectric Effect. First off, what wavelengths could be used to cause a photoelectric on Stainless Steel? What widely available metals have the lowest eV for the photoelectric effect? Could a UV light of 380nm work to cause a photoelectric effect on...

When I heat up, for example, a sweet potato in the microwave, how is the heating process affecting the nutritional aspects of the sweet potato? Heat affects enzymes, proteins, vitamins and whatever else. Does the heat render them useless? I heard vitamin C is destroyed in the pasteurization...

I had read that Roger Penrose and others (like Hameroff and Chalmers from Arizona) have been studying the possibility that quantum events may influence the way our nerves fire and our brains develop thought. Can anyone comment on the scientific progress of these studies?

I've recently been pondering the following thought experiment: Assume that the Earth was to gain a large amount of mass in a very short time, which effectively increase the mass of the Earth by approx. 1.5 * 1021 kg, and this in course of say five years. What I've been trying to figure out...

I was posting on another thread and it got me wondering: how come a photon is absorbed in the photoelectric effect but it is only partially absorbed in the Compton Effect? How come the electron in the Compton Effect does not absorb the photon entirely like the photoelectric effect? If photon is...

Why do we not consider quantum effects when we deal with motion of electrons in a Cathode Ray Oscilloscope, or in a cyclotron? We derive various relations using classical physics which turn out to be quite accurate in the laboratory.How is this possible when it is expressly known that classical...

I'm trying to confirm my understanding of the simple effects of SR Lorentz contraction and SR aberration on the apparent angular size of an object receding at relativistic speeds. Consider a detector at rest in inertial frame S, which is observing light emitted uniformly from the planar...

I was thinking that as far as I know, an atomic clock, and a mechanical clock, or a tuning fork clock might be affected differently by gravitation and acceleration. Is there any experimental verification of this? I'm trying to figure out if atoms will decay faster and that is it. Or if...

Imagine you were safely enchambered right at the center of the earth. Here you would "experience" strong gravitational "forces" but since they all point in opposite directions you would float around as if you were in zero-gravity. My question is, whether you would experience time dilation or...

Can anyone explain that how the ice's temperature is zero degree and water's temperature is 80 degree are mix and their final temperature is zero degree if the both ice and water has the same mass? Where: mc(delta T) of water = (mc(delta T) + mL ) of ice the result for final...

When or if an object exceeds the speed of light what will the reaction be a) in our atmosphere, b) in space? Thank you in advance Tom F