Effects Definition and 1000 Threads

Hi all, I'm trying to find resources for how to calculate and find what I should expect as the result of the interface between two metals with different work functions. http://en.wikipedia.org/wiki/Anderson's_rule"]Anderson's[/PLAIN] Rule tells us how to do this for two semiconductors and...

Hello, How can I mathematically see how Schumann resonances affects 5-MeO-DMT production in the pineal gland? My goal in this sub area of a project is to figure what frequencies affect Melatonin/5-MeO-DMT production. (I have not studied much in chemistry but I'm working on a personal...

A small solid sphere of mass M0, of radius R0, and of uniform density ρ0 is placed in a large bowl containing water. It floats and the level of the water in the dish is L. Given the information below, determine the possible effects on the water level L, (R-Rises, F-Falls, U-Unchanged), when that...

For example - When an electron is excited from an inner shell to an outer shell in an atom, it does the quantum jump between the states. Pretty much it disappears from inner state and appears in outer state. Isn't this happening at faster than light? (The velocity is actually infinity for...

Greetings. I want to experiment with the effects of macroscopic ionized solids. But first, let's have a little 'thought experiment'! If I have say, a gram of elemental copper, surrounded by ultra-pure water and it's put into a device which is capable of filling all of the valence...

Hi. I am trying to understand some features related to the order of a phase transition. It is known that there are finite size effects in a finite system. The finite size scaling theory provides relations between some quantities with the length of the system L. At second order phase...

Hi, I'm an intern in an energy research company and I'm asking if anyone has any links or channels to papers or studies conducted on the effects of barnacle growth or other causes of surface roughness on tidal turbines? I apologize in advance if I have posted under the wrong part of physics...

The figure below shows a section of the human forearm in equilibrium. The weight of the object in the hand is 60 N. The centre of gravity of this object is 32 cm from the elbow. The bicep provides an upward force of magnitude F. The distance between the line of action of this force...

Trying to find the relationship between voltage and power across a resistive something. Using a lightbulb if the bulb was rated at 100W when 140 Volts is used, what would happen to the power if the voltage was doubled? (assuming the light bulb doesn't explode)

Trying to understand what happens upon impact to the metal of a car that is stopped (Vehicle 1)when another car's driver's side rear (Vehicle 2) impacts the stationary car . Vehicle 2 is a heavier, larger car and is moving in reverse at approximately 10-15 MPH. The impact site on Vehicle 1 is...

How does the diameter change from one manometer say of radius x cm to say 2x or 3x cm change the height difference if the liquid in the manometer is of constant mass, density and gravitational field strength remains the same? P.S could some working also be shown just to get a mathematical...

I forget where I read it but one author said that mountains of ink have been spilled debating why quantum effects disappear at the quantum level. I don't understand why this is a problem, I think the answer is rather obvious. One poster on another thread wrote: "Technically - classical physics...

How does decreasing the volume increase the temperature of the gases? I was doing an experiment today and when i decreased the volume of the gas from 65ml at 1atm to 20ml the temperature detected an increase of 0.5°C. However, in Boyle's Law temperature is a constant. So would this mean...

Linear Model topic: Given that we have a crossed fixed model w/o interaction, how would I go about testing for the main effects using extra (seq) sum of squares? I know I am supposed to somehow use the F test and get the non centrality parameter but I don't know how to start... Thanks!

I had read that water is essential for any acid. When HCl is dissolved in water, it produces H+ ions which cause the litmus paper to change it colour! But if HCl gas is liquidified and then tested with liquid, what would be the results? As wel as this pure liquid HCl is corrosive or not?

Does anybody know of any studies that effect how society regulates neurotransmitters and/or hormones in the body; especially long term. Specifically any studies about how they (especially neurotransmitters) regulate in social groups. Its a theory I have and I'd like to see if there is anything...

Is the effect of gravity ever considered in particle accelerator experiments? I would think not with all the high energy, velocities, and stong electric fields in use. But I am interested if gravitational effects have ever been considered or adjusts made to compensate for gravity's downward...

I was watching a video of Michio Kaku. He said that when you go faster than light, time goes backwards and objects have negative mass. Does SR really predict such FTL effects?

Homework Statement 2 parallel plate capacitors of distance separation d between the plates are connected in parallel of capacitance C_1 and C_2 respectively and charged with a voltage V after that the Voltage is disconnected and a dielectric of κ is inserted into C_2 I) Express the charge on...

I have read from time to time (e.g. Lakowicz) that the fluorescence spectrum of a substance is not generally influenced by the wavelength excitation source. On the other had there is a correlation as exemplified in excitation-emission matrix spectra for example. The obvious case is for...

If a probe is sent to the Tau Ceti system and does not accelerate outside the solar system (keeps a constant velocity when passing the heliosphere) will it not experience relitivistic effects? Could it then send a message back to Earth in 50 years for us?

How much power would be produced when using an independently powered supply of 100 pound/min air at 3bar/40F air on a 6.2L GM LS V8. Excess air will be vented to atmosphere with relief valves to stabilize the air flow to the throttle valve. What are the factors need to be considered...

I am considering the effects on volumetric and mass flow rate for two conditions: Condition 1) 1013mBar, 21C (Air density as per) Condition 2) 700mBar (10,000ft) 21C (Air density as per) Setup: A variable flow restrictor is connected to a constant source of oxygen at 50 psig. The variable...

So gravity bends space, and black holes bend space in a loop. Is it possible for there to be a gravitational field somewhere in space, just strong enough, that it bends the light emitted by our system back to us so we could see ourselves?

Homework Statement For a zero initial deflection and for a finite initial velocity, the time dependence of the vibration response of an overdamped system to an impulse is given by: (1) θ(t)=[I/(mω)√(ζ^2-1)][e^-(ζωt)][cosh(ω√(ζ^2-1))t] which for large values of time becomes: (2)...

The so called f (R)-gravity could be, in principle, able to explain the accelerated expansion of the Universe without adding unknown forms of dark energy/dark matter but, more simply, extending the General Relativity by generic functions of the Ricci scalar. However, a part several...

Hi, Has anyone in recent times reproduced the experiments of Kristian Birkeland, WRT to his Saturn effect using his terrella? If so what were the conditions? Adam

hey guys, im not really a physicist (so sorry if this sounds dumb I guess) but I came on here to ask a question i was meditating on while i was out on a walk -- I have a basic understanding of special relativity (like I said I'm not a physicist though and I haven't really taken any classes...

In a general situation, how do you change origin (mathematically speaking) in a physical context i.e. with position vectors, constant vectors, unit vectors to certain directions ... ? I am a bit confused with the concept.

Let's say a receiving device that requires compressed air is 1.5 miles away from the source and demands 600 cubic feet per minute. Let's say the pipes have a diameter of four inches and already contain air at 90psi. If friction in the pipes would be ignored, it would require the same amount...

1. The problem Okay. So just too briefly outline my experiment: I have a pendulum bob attached to two cardboard discs, and am testing to see how the radius of the cardboard discs effects the damping of the simple harmonic oscillator (the pendulum). I have results (such as the one below which...

I have been reading a lot about nuclear plants and how when things go wrong the whole area becomes inhabitable. I have been trying to understand certain things but i am not sure. I hope my understanding of it are not filled with self-inflicted misconceptions. 1) Uranium crystals found in nature...

Homework Statement The number 15 is added to each of the biggest 150 numbers in a distribution of 301 numbers in other words n=301 A. How does this addition affect the median of the distribution B. how does this addition affect the mode of the distribution C. How does this addition affect...

Wouldn't the Redshift result in decreased heat from far distant stars, resulting in an equilibirum temperature, much lower than the average star?

Hi, someone was telling me that if you have two metals in close contact (like, one sputtered onto the other or something) with each other, if they have different work functions, you'll get some sort of diode effect (even without either of them being doped) if you have a current running from one...

OK, so the moon has a rather large mass (I found somewhere a comparison with Earth which gave a value of about 75 billion trillion Kg/M3), but the spacecraft s Ebb and Flow are traveling rather fast with quite a lot of momentum(132KG each, 6050km/s = around 800000Kg m/s). So what sort of...

I've been wondering.. If a person (A) is, say, on top of Mt. Everest, he would be moving faster than a guy (B) at the foot of the mountain since A is further from the center of the earth, but he would also be experiencing a weaker gravitational force than B. So, for which of the invidividuals...

This is something that just occurred to me. I was cleaning out an old closet when I came across some speaker wire, kind of like this. I was wondering, what would happen if I wrapped that around a tesla coil secondary coil? You have two separate coils interwinding, essentially, so would the...

Homework Statement Kundt's Tube.First of all, i used a aluminum rod. Then i rubbed it to cause vibration . Homework Equations a)How can i change the frequency of the sound produced in tube. b)What is the difference of rubbing the metal with more pressure?The Attempt at a Solution a)...

Hi I came across this excellent forum :) I am trying to figure out the solar wobble. When only looking at the Sun+Jupiter+Saturn, my intuitive interpretation is that the Sun will go faster/wobble more at Jupiter-Saturn-conjunction, and slower at oppositions. Is this correct? If so, there...

There are two types of zeeman effect, one normal and the other one anormal, but why are they called so? I mean what is so normal about the normal zeeman effect and what is so anormal about the anormal zeeman effect??

Assume the following hypothetical situation: an enormous body, 20,000 ly in diameter (I recognise that 'asteroids' per se tend to be smaller), approaches the Milky Way, perpendicular to its equatorial plane, and headed straight for planet Earth, or at least on a trajectory where it will...

So I understand the basics of the general and special relativistic effects on the speed of the satellite clocks onboard the GPS satellites, and why they are rigged to calculate time slower than an atomic clock at sea level. But then, in several articles, I read that GPS receivers are also...

Hi guys :) I'm designing an automatic soap dispenser, in which the soap particles contain phosphors. These will emit visible light in the presence of UV light. I intend to have a small UV light source underneath the dispenser. Thing is, its really bright in bathrooms, and its tricky to see...

Consider a two-electron system in which both of electrons have the same spins. They like to repel each other and so it seems that the energy of the system will increase compared with the situation in which two-electron system is composed of opposite spins that they can settle in the same place...

a) Are quantum effects relevant for the air around us? "Formulas": The Fermi energy of athmosperic air: \epsilon_F = \dfrac{\hbar^2}{2m_{air}}(3\pi^2C)^{2/3} Attempt to solve: I calculated the fermi energy to : \epsilon_F = 1\times 10^{-25}\,\text{J} And k_bT = k_b 293\,\text{K} = 4\times...

Hey, So if I were doing an experiment in which I have a current carrying coil, at what angle to the Earth's magnetic field would I need to rotate the coil in order to minimize the effect of Earth's field? I was assuming parallel to the direction of the Earth's magnetic field. I assume it has to...

People take 5-HTP supplements mainly to increase the levels of serotonin in their brains (i.e. to help them sleep, the elevate the mood and other reasons) but I've heard some horror stories about people having heart attacks and other serious side effects from taking it. I think most of these...

A sphere with the radius of 4 kilometers and a mass of 2 suns moves to observer at the speed of 0.866c. From sphere frame of reference it's mass is 1 sun's mass, radius 4 kilometers and velocity 0. Can light escape from such object? Does escaping is also relative? How about direction of light...

I've noticed an interesting observation about how the lives of all the people in my elementary AIG (academically intellectually gifted). Out of the 11 of us, the only two not to go to college came from very poor homes. (Even from the beginning, only 4 of us were the kids of a...