Effects Definition and 963 Threads

I was reading in my fluid mechanics book how the speed of the t-rex was calculated through dimensionless analysis. They plotted v^2/gl vs s/l v=velocity g=acceleration due to gravity l=leg length s=stride Which showed that the data for most animals fell approximatly on one curve. My book...

Hi all, An electrolytic capacitor has 2 AC sources connected to it, 1 at each plate. The AC sources are 180 degrees out of phase and have a high impedance which limits current in the nA range. Even though each plate should have AC on it which is 180 out of phase the voltage at each plate...

When the dielectric in a capacitor polarizes does it effect the leakage current through the dielectric? Just wondering, if you had a capacitor with a lossy dielectric and you were able to polarize the dielectric would the leakage current drop? Can anyone give me any links for further...

Just curious see if anyone would know exactly or have any ideas on what would happen if an object were to travel faster than the speed of light. I've asked my physics teacher but he didnt know so I figured i would ask a larger audience. So here it goes... If an object were to some how travel...

hi i was wondering whether the lorentz force is just caused by the fact, that moving charges produce a magnetic field, just like every current does, and this magnetic field interacts with the magnetic field in the environment, that causes the force or whether the lorentz force has nothing to...

"Quantum Effects Brought to Light" Have had this article for a while now - http://www.nature.com/news/2011/110428/full/news.2011.252.html - but I was wondering why you wouldn't expect Bell's inequality to be violated had the entanglement been broken before amplification. The results, prior to...

before i ask my question i want to review two points: 1. place a body like a moon or a planet near a black hole, as the body approaches the extreme gravity affects the body deferentially. 2. review the tidal forces on Jupiter's moon Io leading to volcanic/tectonic consequences. now take...

How big would an asteroid or comet need to be to say, disturb the moons orbit, either by impact or gravitational attraction? And would this significantly alter the chances of "Death From Above"? :)

The potential effects of "Potassium chlorate" on the human body. To the many distinguished members of the chemistry field, I am a U.S. Army EOD (explosive ordnance disposal) Tech who returned from Afghanistan about 3 months ago. During my deployment I was forced to manually enter an IED...

Hi! Need some help here. Are the effects of general relativity reciprocal in two reference frames? Let's say for example that there is one man at the bottom of a really, really tall building, and another at the top. The man at the top floor should perceive the man at the bottom to be...

Looking to learn physics about how a bicycle works and if it effects projectiles because of the rotational inertia if a bike was to go off a ramp. any suggestions?

My son is a 3rd grader and wanted to do a science fair project on solar cells. So we devised an experiment to see if reflecting light with a mirrow would increase power output. We constructed a circuit using an amp-meter, solar cell, and 10Kohm resistor. He hypothesized that reflecting sun...

I'm working on some paintings about the effects of sub-bass in the 30-70hz range. I've been trying, without success, to find info online about the likely pattern effects it could produce, say in water or sand, or anything that its wave patterns would show up in. Any clues anyone? Also...

Hi there. I've been watching some documentaries on the Big bang and the laws of nature. One particular interesting bit of information I gathered was on the effects of a black-hole on light and time. It was explained that the gravitational pull captures light, which is why there are...

Hello, I posted this here because it is for a bit of course work, but I am just looking to confirm if I am using the right equation. I hope this is ok! If not, sorry! I just didn't think since I was asking a specific assignment question, I would post here. I need to investiage how changing...

How gravitational potential effects mass? Is this formula m = m0/sqrt(1-Φ/c^2) right or at least close to reality? The purpose of the question: If overage Φ decreases because of Universe is expanding, then maybe it can help to find another explanation why it expands with acceleration. Lets...

If you are traveling very very fast in a space ship, are there any visual effects produced by general relativity that you wouldn't see from just special relativity? Assuming we don't get close to large gravity wells like black holes. Does the acceleration of the ship produce any visual...

if there is dark matter every where, why it is noticed near galaxies? why can't we do some very sensitive lab experiments of gravity to find the effect of dark matter?

I readhttp://www.learner.org/courses/physics/unit/text.html?unit=6&secNum=6" article and started wondering: What is the real reason for classical behavior of liquids gases at room temp? I have always thought that it is because of the deBroigle wavelength relation. At room T particles have a...

The house where I live has a wall made of bamboo slats. There are small square holes between the slats, but when light shines through the square holes onto a surface the shape is always round. Why is that?

I had mentioned that I dropped the idea of posting a lens testing lab I am trying to develop for class here because the technical details got out of control, but I didn't post any images showing why I came to that conclusion. Here are 4 images of the central region of a Richardson test slide...

General relativity finds that gravity dilates the wavelength of light and the time period of an atomic clock. What does gravity do to the length of a (material) rod? If you know the answer, please cite me a reference or two.

hi,guys do you know when the coin will fall from a magnet and when would it stay on it?

Is there any effect of expansion of world on our solar system? i.e. Is there any change in distance between Earth and sun due to expansion of world?

I have been trying to understand what the effects of Gravitomagnetism are, I've looked at the equations, but my mathematical knowledge isn't high enough to be able to draw anything conclusive from them directly. I've heard it both described as causing an attractive force (a la Magnetism), and...

Hi, I am doing my Extended Essay in Physics(so yeah, I am doing the IB). I am really interested in taking up electrical engineering at university, and so, I had done an EE in piezoelectricity. I have taken the crystal from a barbecue lighter and connected it to a vernier( a machine that can...

The electrical circuits in a house run on alternating current. This is a current of electrical charges that oscillates back and forth at a frequency of 60 Hz. Do these currents produce magnetic fields? Explain. Do these circuits radiate electromagnetic waves? Why or why not? I don't have any...

I know this question may be a bit vague, and probably needs better wording, but I struggle to rephrase it. What is the effect that a larger planet eg. Jupiter has on a smaller nearby planet eg. Mars? This question is based mainly on the orbital path of both planets, how is it influenced?

Hi I am from India, a Hindu by birth (Hinduism is a religion). Here horoscope match is considered essential for marriage. My horoscope was found to be bad since it contains http://en.wikipedia.org/wiki/Mangal_Dosha" (Mars danger) and naga dosha (snake danger). It is believed that if a person...

The "god helmet" effects on the brain Vs. it happening without wearing one. http://en.wikipedia.org/wiki/God_helmet - It obviously has an impact on the brain, some more unique or intense than others. What I'm curious about is if the phenomenon is a product of the brain or something...

Hi everyobdy. First, forgive me for mistakes, since English is not my native language. I'm going to ask a kinda strange question, so let me add a short premise. I'm a first grade MD, andrology will be my area of expertise. I have to give an advice about a patient who has Peyronie' disease...

Let's say we have a blank universe and have a 1kg mass. At some point in time, this is near-instantaneously replaced by a heavier mass. Both masses are stationary. Will the lighter mass, before it is replaced, see effects due to the heavier mass existing in the future? In turn, will the heavier...

I read in Dr. Ivy's book* that testosterone blocks the effects of cortisol and causes cortisol levels to rise in response to this cortisol resistance but has a net pro-anabolic effect (I guess in part because it blocks cortisol's catabolic effects and the body will not totally normalize the...

Hello All I'm new to the forum and have a question. I was looking at the time dilation function and noticed that negative time would be described with imaginary numbers and be a kind of anti-time, albeit that rest mass can not be pushed faster than the speed of light but for the sake of...

Hey guys, I understand that 'ballistic re-entry' is usually used in the context of drag only with 0 lift, but if I were to look into the effects of lift how would I go about resolving the forces acting on a body at each instant to determine the instantaneous body acceleration ? My initial...

If we put two identical quarter-wave plates together what will be the resulting plate? How would it be different from one of the quarter-wave plates?

As I was lying awake staring at the ceiling last night, I wondered what the effects of sleep deprivation were. Would you experience decreased coordination, memory loss, ect? A timeline would be useful, i.e. Day 1-lalalalala, like that. I have heard that the CIA once used sleep deprivation as a...

How does radiation (e.g. x-ray) affect the flow of electrons in an electric field? More specifically how does this affect for instance the resistance of a resistor. Thanks in advance. :smile:

Hey @ all, when windowing in DSP in time domain one multiplies all recorded time samples with a weighting factor (hanning, hamming, etc.), followed by a Fourier transform (FFT) to reduce sidelobes in the spectral domain. But now when thinking about starting up in frequency domain where I...

When pressurized heated air is released does the temperature drop down below ambient temperature, or simply finds temperature equilibrium with ambient air?

Hi PF I was wondering about the problem of quantum gravity, and maybe the reason why we struggle so much with a formulation of quantum gravity is, that spacetime itself is the source to all quantum phenomena. The evidence is, that with the standard model, we describe the quantum phenomena...

How does the angular velocity change with increase in the mass? For example : if there is a shaft rotating at 1500 Rpm , then if a disc of 5 kg is fastened , does the angular velocity of the disc will be same as 1500 RPM , and what happens to the RPM if the disc mass is 50Kg.

Hi all, If one were to consider a classical particle in a box of length L in Minkowski space then clearly the time taken to go between the walls of the box is L/v with v velocity. In the GR case with some metric coefficients A(r) and B(r) (spherically symmetric system, say) it's clear that...

I saw this video on a car cleaning product. In it he talks about the improtance of pH balance and how it effects metals. I'm not a chemist, and it's been a long time since I took undergrad chemistry. You can see he does a little lab experiment with the metals in the various pH cleaning solutions...

if i consider space time to b a fabric as considered by einstein then expansion of this fabric leads in two direction 1-if the fabric has high elasticity then the curvature of space caused by the a massive object will keep on increasing,thus the flow of time will be faster...

Hi all, I've just been thinking about something today which I freely admit I've not got the knowledge to actually comprehend at this time (my physics studies don't start until September!) and so it might actually belong in engineering or it might just be a load of nonsense that I've gotten...

Hello all, I feel somewhat strange posting on this forum because I'm majoring in biology and we're supposed to be the enemies of physics, but I've come across a question that I can't seem to find an answer to; this is actually in regards to independent research. Does instantaneous or prolonged...

If dark matter really does exist everywhere, and is constantly passing through our bodies, why doesn't this extremely dense matter affect regular matter? How are the atoms of our body not pulled by dark matter's gradational field? Also, if dark matter is thought to exist because stars in...

Can/do relativistic effects explain select quantum "phenomena" Can/do relativistic effects explain select quantum "phenomena"? A photon (a mass less "particle" that travels at the speed of light) experiences space-time in a different manner. A photon does not experience time. Would the sun...

I'm an amateur, but was wondering if you experts can help me wrap my head around gravity velocity and time; and the universe. If as gravity increases time slows down, isn't time faster on Earth than on the sun? And faster, still in interstellar and intergalactic space? Also, if the...