Effects Definition and 1000 Threads

Homework Statement Two charged pellets are pulled apart to twice their original separation. (a) Which is likely to be larger, the gravitational force or the electrical force between them? Why? (b) Which will change by a greater factor when they are pulled apart, the gravitational force or the...

Homework Statement In the figure, a point charge -3.2μ C is a distance d/2 directly above the center of a square of side d = 0.34 cm . What is the magnitude of the electric flux through the square? (Hint: Think of the square as on face of a cube with edge d.) (in N*m^2/C) Homework...

I have come unstuck in my coursework project, and cannot find any information/equations for the effects of shielding on wind loading in a structure (This is not an ordinary structure, it is an unsymmetrical sculpture made up of circular and Universal beams). So i would firstly like to find how...

Homework Statement A star of mass M and radius r rotates with angular speed of such value that objects on the surface at its equator are just about to experience zero apparent weight. The period of rotation of the star is given by? Homework Equations g' = g- Rw[SUB]2 (where w is the...

My question is to what extent the specifically non-linear properties of GR have been analyzed by theoretical physicists. Can they give rise to chaos and complexity, as many non-linear systems do? I also wonder: I've so far mostly read about linearized descriptions of gravitational waves...

Calculating effects of air resistance on a ball of mass 0.67kg, being dropped from a height of 4.93m. I have worked out theoretically what time it would take without air resistance using s=ut + 0.5at(squared) however i cannot find an equation that will factor in air resistance. thanks

The woman I love has been diagnosed with Ovarian Cancer; so any info, or personal experiences shared here would be much appreciated. Of course she has a doctor to tell her what to expect. But it just so happens to be a very touchy subject with her; and getting any feedback on any matter at...

Hi all, I'd like to know what happens when we consider relativistic effects in generating a pseudopotential? Any refrence recommandation is welcome. regards, Hana

Homework Statement Two of the MHD equations can be formulated as \vec{E} + \vec{v} \times \vec{B} = \eta \vec{J} \nabla \times \vec{B} = \mu_0 \vec{J} where [itex]\eta[/tex] is the resistivity of the plasma. a.) Derive an equation for the magnetic field at very high resistivity and...

Hi I'm an MPhys Physics with Astro student, conducting my final year project in the field of radio astronomy (well, it's more like electronics at the moment - trying to fix a downconverter, but anyway...) My question: I'm interested in observing the 6.67GHz methanol maser emission. For a...

How and why does quantum leap occur? And (please do not mind my 'confusion') how can an electron "absorb" a photon? If in this singularity, all photons were prematurly absorbed and ,in response, release, how are photons created. Before, i thought electrons jumped levels due to other quantized...

It is my understanding that the Equivalence Principle postulates that if I were standing in a closed room, I would not be able to distinguish whether the downward force that I felt was caused by (1) the presence of a massive body such as the Earth exerting a downward gravitational force or (2)...

Hi I know that our world is quite unstable and minor changes in these parameters could make the existence of life impossible. However, I am interested in what exactly is going to happen if we start to increase/decrease any of 30 parameters. It is interesting how well-tuned these parameters...

Homework Statement If you increase the temperature of an ideal gas, then a. the average distance a molecule travels between collisions must increase b. the pressure must increase c. the speed of its molecules must increase d. the average time between collisions of its molecule must...

Can anyone explain why a CT would be subject to flux saturation, but a VT normally wouldn't?

Hi there, This is my first post and I am guessing I should post my question here at the astrophysics section so I'm doing so (admin, if you think the topic should belong somewhere else, please move it). My question is with regards to the continued research conducted by Tajmar et al...

1)I have noticed a physical phenomenon that is fairly consistent if I repeat the process in varied surroundings. This situation is this: I fill a wash basin that has a removable plug, pull the plug and record the length of time required for the basin to empty. I can repeat the exercise...

In a nearby thread: I believe it was correctly concluded "yes" because an electromagnetic (EM) field has energy and pressure so it curves spacetime; it does have a gravitational effect. Although it was not discussed, this effect is much, much smaller than the electromagnetic effects because...

astronaut traveling.. what effects would she feel?? Homework Statement An astronaut is traveling in a rocket in outer space in a straight line at a constant speed of 0.5c. Which of the following effects would she experience? Her heart rate would change. She would feel heavier. She would...

Hello, I'm a bit confused here about this topic. I can't seem to find a proper book on it so reading loads of papers of try and get a grip on it. I had come to the understanding that the high tensile and yeild strength developed here was due to the subgrain/micrograin size and the partial...

Is it possible to simulate capillary effects in a channel using femlab (exclude the newest version)? I mean the new version has wetted wall boundary condition setting, which can set the wall adhesion and the contact angle between the air/liquid interface and the wall. But the older version...

Hypothetical thought experiment; What would happen if you created a very long cylindrical material, eg 100 000km long and took it into deep space. Here you rotate one side of it so the tube is spinning in a large circle with radius 100 000km, ignoring friction and gravity. Once it is...

Hi, I am currently doing a scientific research regarding epoxy adhesive. Basically, you shine UV light onto the adhesive, it hardens. Im given certain parameters like, intensity of UV light and duration of exposure. I am supposed to investigate effects of varying parameters on...

Could someone PLEASE explain in simple language "procedures whereby scientists modify the germ plasm of plants and animals by the use of X rays?" And, how might that effect chromosomes? If you do not know, please advise where I can find this information. I am not a student and this is related...

I recently got this as an idea for an interesting independent project. I had planned to do the experiment using the four point method of resistance measurement, but I'm stuck on figuring out just what materials I might need to use. I intend to use the basic high school equipment, nothing too...

I would be glad if someone compiled a list or atleast provide the link for the actions of various oxidizing and reducing agents like LAH, BAH, hydrogen, potassium permanganate etc. and on the various functional groups. This will be very useful to any organic aficionado and I will be very happy...

Homework Statement the speed of dc motor is given by N=60(A/p)(V-Ia*Ra)/(Z*phi) where, A=no. of parellel paths P=no of poles V=voltage applied at dc motor Ia= armature current Ra=armeture resistence Z= total no. of armature conductor phi=flux per conductor. but if some how we stop...

i need to learn c/c++ to add effect on 3d objects and to use agia physix engine (like adding gravity , refraction,...etc) and i don't know where to start and what to read and what to learn there is so much books and so much programs and lectures (i don't mean the 101 books i mean after that)...

Hi, I has a question about Optical effects of special relativity. I recently watching a video about this in You Tube, my question is: Ever wonder what the world would look like as a photon?

Fascinating. I love Canadian nature films.

When you stand up, blood pressure in your feet rise the most and become appx. 180 mmHg. How then does blood flow throughout the vascular when aortic pressure is 120 mmHg? difference in P=FlowX Resistance

what is the effect of a magnetic field on a electron? please with equations

i've been trying to get the exact definition of a banked angle but so far, I've gotten nothing so i would like somebody to please tell me the definition and explain it effect on the performance of motor vehicles

Can anyone validate that phase always decreases in the direction of propagation of wave? Also if i have a sonometre wire in which i develop a transverse wave using a tuning fork and then i immerse the weight into water i.e change the tension, will the frequency also change? I mean frequency...

Hello to every one. I'm presently embarking on a problem about electron emission under applied electric field. Of course, basically there are two mechanisms for electrons to escape into the vacuum from a sample: the thermionic and the tunneling. Here I'm concerned only with the latter. As usual...

Would somebody be kind enough to explain what exactly is meant when discussing short- or long-distance contributions/effects to branching ratio calculations?

If i have a series DC motor and at say X rpm it has a back emf of 11.5v and supply voltage of 12v and i increased the supply voltage (keeping rpm the same) would the back emf stay the same? and if not would the diffrence between back emf and supply increase? Thank you.

How sensitive are neurons and chemical receptors like olfactory receptors to the chemicals that stimulate them? Can a single molecule stimulate a nerve? How many photons does it take to stimulate a rod or a cone in the eye? I ask because I'm curious as to whether or not human thought and...

Ok my question is pretty simple and is in two parts. 1. say you created an em field what would have to an em wave the is propogating towards it. 2. what would would to an em wave if it went through an em coil. If you could would you be able to point me in the direction a...

hi friends, can anyone gimme a link describing the aerodynamic effect of a moving train on its vicnity space. a study about how the air around it becomes when the train moves.

A week or so ago, my high school physics teacher sent us all summer work - we have to write an article explaining the processes by which electromagnetic fields (particularly low frequency electromagnetic fields) could effect the human body. Since then, I have been wading through the large wealth...

What are the effects of tanning, like from a tanning bed/natural sun, compared to the effects on the skin from a "tan in a bottle" product? I am about as pale as they come, but some of my friends do the "fake" tan things, and I try to tell them its bad for their skin, but I don't know how or...

Voltage drop due to a resistance: Determined by resistance*current Voltage drop due to an inductance: Determined by inductance*change in current/change in time Voltage drop due to a capacitance: Determined by charge stored / capacitance Assuming applied voltage is constant: Question 1: Must...

Heey everybody,First my excuses, I'm not a natural English speaker, so there will be some languistical mistakes in my question :smile:. Now my question: I'm going to make a C-program to show relativistic effects. I would prefer to make a short 'movie' and then 'convert' it in the C-program so...

I am going into my fourth year of studying physics and math as an undergrad. So I'm starting to think about what I want to research after I graduate. So far I'm pretty sure I want to go into biophysics. Specifically, I'm interesting in studying quantum mechanical effects in biological or organic...

Homework Statement Consider a blob of luminous matter moving along a direction \hat{x} at an angle \theta to your line of sight at a relativistic speed v. (a) According to you, the stationary observer at a distance d, what is the apparent transverse velocity of the blob? Hint: you must...

One of the best sources to learn about a particular subject area in a field of study is to read someone's thesis. In this thesis, in one shot, the author has covered rather well the technique of angle-resolved photoemission spectroscopy (ARPES), many-body physics, BCS superconductivity, Fermi...

Neglecting air resistance on Earth and regardless of how fast or slow a projectile's initial horizontal velocity is when fired from the same fixed height, they will all fall at the same time. Is this because regardless of the horizontal motions, the vertical motion is the same? Can someone clear...

This is an article from 2000, does anyone know what effects the accident caused are evident now? http://www.ratical.org/radiation/Chernobyl/060700.html

This is a neat paper I found, its a quick read. http://www.isso.uh.edu/publications/A2006/2006_043_garrison.htm