Cause Definition and 572 Threads

Hello everyone, I'm talking about retaining urine in the bladder,not renal failure, so I can't think of uraemia as a course. So what is the reason behind this. Thanks :)

I was curious about what forces can be applied to a molecule to cause a rotational emission.

What cause the atomic orbitals electron configuration ? Thanks in advance

can kinetic friction cause a torque? (can it result in rotation) Or is it that only static friction can cause a torque? Can static friction do work on a rolling object? I think it can? because the rotational kinetic energy is increasing? is this right? HELP!

Would a crowd be able to push so hard to kill an individual? Apart from all political disputes and different reports concerning the recent Hajj pilgrimage incident, I’m a bit curious as to some physical aspects of the incident.Suppose some one million pilgrims are walking towards a particular...

According to the wikipedia article about the transition dipole moment: When an atom or molecule interacts with an electromagnetic wave of frequency , it can undergo a transition from an initial to a final state of energy difference through the coupling of the electromagnetic field to the...

As I understand and I think correctly, that Green house effect is in essence conversion of lower wavelengths in the Sun's energy to higher wavelength near infrared regions which can heat up the medium more efficiently. So if we have a closed transparent box containing some amount of green house...

My question is slightly philosophical, so be warned. If we could only experience the world through a recording played backward, what laws would we form? I am asking, because the strangest thing occurred to me: at least some of these laws would be exactly like ours. Say, you have two coins...

The moon often glows red during a total eclipse because light from Earth's atmosphere is refracted into the Earth's umbra, and Rayleigh scattering filters out blue wavelengths. Who first came up with this idea and how? I'd love to know the history behind that insight.

Does physics need rigour?My problem lies with the fact that if a physicist makes a mathematical error he may not be able to identify it due to his lack of understanding of the rigourous mechanism which the mathematician is aware of.

I was just looking over the method of variation of parameters again and remembered one part that made me always wonder if this method can be improved in any way. Here's a link for reference: http://tutorial.math.lamar.edu/Classes/DE/VariationofParameters.aspx Now everything stated seems to make...

If only 14% of the total solar emission is in the UV region, why is ozone depletion a cause for concern. Considering that only a small fraction of the sun's total radiation reaches earth.

I was wondering which specific wavelengths of light cause the photolysis of water to happen.

Here is a review article identifying some causes for the high temperature in the central volume of the Earth. http://www.scientificamerican.com/article/why-is-the-Earth's-core-so/ Inside all massive astronomical bodies like the Earth, collisions of atoms occur in a gravitational field. Because...

Hi everyone. I have a question that I would be grateful to receive your insights on. In our bedroom, we have a LED strip running from a typical 12V transformer. We turn it off at night using the controller box, which is in between the LEDs and the transformer. The thing is, a couple of times...

Hello everyone, How does Lymphoedema cause ulcers? Example people with filiariasis having skin ulcers.

So i was watching this video : And it got me thinking... i began wondering why, when space contracts from someones frame of reference (In the video, this would be the frame of reference of the cat), why is it that the protons don't become black-holes when the space contracts? If the density...

Hello all. First, let me say that have very little education in the electronics field, but I do know the basics. I recently got hired as a service tech for pressure washers and had encountered a unit that had a small engine (electric start 12v) with a blown fuse. A co-worker of mine has been...

Hello All, Anyone can help, but first allow me to give you some background, I have a project this project is to measure the frequency of the PCB depaneling machine that might damage the sensetive component which is the gyro-sensor. The sensor will damage if the frequency is above 75kHz or 100...

I originally posted the following question on physics.stackexchange, but no one was able to answer it. I did find this answer on PhysicsForums, but I was already aware of the oscillation of electrons in response to an external electric field. What is the physical cause behind a material having...

I have seen this topic in other threads before, but I have not found an answer that eliminates my confusion. I know that electric potential is defined so that only the position of a charge with respect to a field determines the quantity of the electric potential (voltage). This allows us to...

One of the basic foundation of special relativity is that the speed of light is a constant, hence time is relative to the inertial framework reference. Usually GPS is also mentioned as a modern experimental evidence. My questions: if Maxwell's equations describe EM fields, how can we derive a...

What precisely is going on?

Homework Statement Hello, I know how to solve this problem, I just don't understand an aspect of the conclusion. A car is traveling at some constant velocity forward in a horizontal direction. The ground has a coefficient of static friction of .6. What acceleration in the forward direction...

The modern view of the measurement problem is that any interaction of a particle (say an electron) will cause its wavefunction to 'collapse' in the process called decoherence. No need for conscious observers, interaction with any other particle will cause decoherence hence collapse of the...

I have been exploring (with limited success) if/how the smell of cooking meat produces known physiological responses (beyond Povlov's behavioral conditioning/salivation, but rather what known components actually trigger the response). Looking for some expertise in biology to get me on the right...

The Alcubierre drive is a very interesting theoretical idea, if only as a thought experiment. It might in principle allow travel even faster than light speed (according to some external frame of reference). But we know that faster than light propagation could lead to history inconsistencies...

Hello, this is my first post, i only have what we call an O Level Physics here in the UK, but i have a strong layperson's interest in the subject, so I'm looking forward to picking the brains of the more educated people here. My friend's professor showed him something very interesting, all to...

Given a standard 3-lead ekg where the leads are read as below: Why does atrial depolarization cause an upward deflection? Assuming the EKG is being read from Lead II, I believe that if the current flowing from the negative terminal at RA (right arm) to the positive terminal at LL (left leg) is...

I was just wondering, when particles interact with a force (which would be all the time) , does it cause the wave function to collapse? If so does that mean particles interact with forces in small time periods, since we know particles exist as a probability function? I just assumed that fields...

Im trying to wrap my head around this. If a photon of the right energy hits an atom's electron (hydrogen e.g) it jumps to the next orbital shell, then goes back down to conserve energy releasing a photon in the process. is this how we see the atoms in everyday matter? by the switching of the...

I want to know more about hair loss issue. The basic idea to stop hair loss by knowing the main cause of hair loss. Also provide some valid hair loss treatment available in the market

I was wondering if consciousness really causes the wave-function to collapse, and if this is the reason why our behavior is not erratic. Thanks!

I'm talking about the chemical shift. In XPS test, oxidation leads to the increase of binding energy. This is determined by: 1. attraction between nuclear and the electron 2. shielding effect from outer-shell electrons My question is : What does shielding effect mean? Shield what? The positive...

Lately I've started learning about fuel cells, particularly proton exchange membrane fuel cells (PEMFC), and a fairly basic question that has been bugging me is: Since the cathode is positive, it is clear why the electrons flow through the load and to the cathode, but why do the...

Consider a wire connected to a battery. Now,potential is analogous to the energy of the particles.And potential in a resistor drops because of the friction inside the resistor(considering there is no friction along the wire and outside the resistor).So the friction determines how much energy is...

Hello, So my issue is as follows: You have a car going at a constant speed and the right side of the car hits a ramp which causes that side to elevate and cause the car to rotate about its x axis. What I need to figure out is how fast does the car need to hit the ramp to cause a rollover...

http://plato.stanford.edu/entries/aristotle-causality/#FouCau I'm confused by this The efficient cause: “the primary source of the change or rest”, e.g., the artisan, the art of bronze-casting the statue, the man who gives advice, the father of the child. So.. the efficient cause of an exam...

Dear Physics Forum, Is the Uncertainty Principle the cause of the infinite solutions to Schrodinger's equation? I get the sense it is not. Could you elaborate a little? Thanks, Mark

Is it something like that involves gravitons? Like mass producing gravitons that warp spacetime? All is it something like qft whereby spacetime is just a field and only those with mass can interact with it, resulting in warped in spacetime which is equivalent to excitation of fields in quantum...

(1) I previously learned that a constant magnetic field causes a force on any electrons within its range. Clearly, this force would cause electrons to move. Isn't this creating a current? (2) However, now apparently I am told that the only varying magnetic fields can create a current. I.e...

I am three days away from my E&M finals exam and still I cannot understand this phenomena. What I mean by that is that I can solve questions and apply the mathematical equations I just don't understand what is going on under the hood, what happens when an electric field changes and how does it...

This is just a question I posed to myself while learning about waves, I was wondering how the volume of an audible noise is increased or decreased, is it related to the compression of the wave and therefore the force generating it? If somebody could explain this in mathematical terms or provide...

Which property is responsible for optical density In media

Scientists: Random gene mutations -- 'bad luck' -- primary cause of most cancer http://www.cnn.com/2015/01/02/health/cancer-random-mutation/index.html?hpt=hp_t2

Why is it that one atom such as hydrogen has one proton while others have many. What is the mechanism driving this force which causes some atoms to be marked for one protons and others for many? And once they are say marked as hydrogen they can be nothing else, correct? Since hydrogen is the...

Is there any good approach to determining if an amount of air passing through a given slit or gap will cause a whistling sound? I'm unsure with what shapes whistling might become an issue, and also at what air velocities.

Anxiety sometimes cause diarrhea, sometimes constipation, and sometimes both. It's interesting because it seems their underlying neurophysiology is somehow different. What are underlying physiological processes that lead to these two symptoms in anxious people? Particularly in terms of the...

Can an electric arc(such as this one http://upload.wikimedia.org/wikipedia/commons/7/7a/Electric_arc.jpg ) cause a combustion or fire if a 91 percent alcohol solution is sprayed on it?Thanks

Hi What is the cause of aerospace rotation whit the earth? May the gravity haves any roll?