Effects Definition and 1000 Threads

Here's a question, though I'm not sure if it is suited to the biology section, since it might overlap physics and Earth science. Hell, i don't know; I'm an English major :smile: Forgive me if i make any foolish assumptions. To what extent has the Earth's mass affected the types of life that...

I need help in answering the post lab questions given to us by our professor. 1. Is dc beta constant on every point of the characteristics? What is its effect in the linearity of the transistor? 2. What is the effect of a high dc beta on the characteristic curves? I have attached an...

I found this article: http://arizona.openrepository.com/arizona/handle/10150/185511 Heres a quote from it: I recently (before I came across that article) tried smoking this herb to satisfy a spontaneous urge so this gets me wondering if smoking this substance could be used to combat lung and...

What would the state of water be at if the pressure is 25 bar and the temp is 200 degrees Celsius?

"Many years ago I spent a few weeks on the gaff-rigged topsail schooner Tradewind. I noticed one of the gaffs had a distinct bow in it and asked the skipper about it. He said they were hit broadside on by a rogue wave in sub-Antarctic waters south of New Zealand. The steel gaff had been bent by...

I am trying to develop a spreadsheet to calculate a convection coefficient with altitude as one of the inputs. What variables should I consider? The most obvious are pressure and temperature, but I'm sure there is more to it than that.

I have had a great deal of trouble finding sources that are specific as to how exactly radiation damages the body, it usually just says what damage radiation causes but not how it causes it, so I have compiled what I have found and I want to know if it is accurate and to fill in sequence of...

I have a physics book that says the electrons orbiting an atom are responsible for the physical and chemical properties of that atom. And yet I have managed to find another source which says the number of neutrons can affect the "Density (mass/volume), boiling point, freezing point, and the...

I only just discovered this today: http://what-if.xkcd.com/1/ I didn't know about it before. My question is simple: what do you think of Randall's analysis of the physics here? Is he "on the ball?"

If we had a positive point charge of incredible quantity, does there exist an imaginary sphere about it, such that regardless of the initial speed and direction of any electron, that electron could not escape spiraling into the positive point charge? Conversely, regardless of the initial...

I'm trying to increase my understanding of what happens to waves with interference so I'll ask the following question to try and do so. If one had a pool of water with a wave machine pulling the side in and out all along one side and an identical wave machine on the other side working in...

If I want to measure the position of a particle, and to do so I bombard it with a photon. What attributes of the particle will this interaction affect? I would think that it could affect both the particle's direction and its mass, which in turn would have an effect on both its position and its...

Given the above quote reference Helium within our Heliosphere, I have a grouping of questions for the electromagnetic wise. If Earth and Jupiter were both placed within a dense Helium plasma region/field of our Heliosphere at the same time; and considering He plasma's high electrical...

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...

Here's a few smattered questions I've had a hard time finding good answers for: 1. Why is the speed of light a constant? Is it related to the fact that it is massless? Is it because it isn't subject to time dilation? 2. Why is the speed of sound, or EVERYTHING for that matter, not...

I've been searching for some type of equation or explanation of how to find the latency (access time) of a memory system when given the bandwidth, the precharge (refreshing) time between accesses, and how many bytes of data are being transferred... Also I am not sure as to how memory...

why cdw occurs at low dimensional solids with anisotropic fermi surfaces that have prominent nesting vectors?/ what it means : cdws are also common at the surface of solids??where they are more commonly called surface reconstruction or dimerization . PLZ tell me about two dimensional Fermi...

Hi All, Assuming Stokes drag, wikipedia suggests this problem (the solution for v(t) ) has an analytical solution. Is this right? http://en.wikipedia.org/wiki/Drag_%28physics%29#Very_low_Reynolds_numbers.E2.80.94Stokes.27_drag Could someone point me to the derivation online? Or a...

I was just reading R.Feynman's Lectures on physics Vol I and I came across this discussion in which he says that magnetic field results from an electric field i.e relative motion of electrons and so on. Further, he says that the electomagnetic spectrum consists of light waves... The whole...

1.what is the main cause for the emf produced in a thermocouple when their two junctions are at different temperatures? 2.why is it necessary that the emf produced causes the current to pass from the metal (which is at the top of thermoelectric series) to the other metal (which is at lower...

Hi everyone, So, I've been trying to derive a general form for momentum Fourier transform of the polarizability \chi(\mathbf{r}t,\mathbf{r}'t') for a crystalline material, i.e. a material with a Bravais lattice. Since the material is not translationally invariant, it won't be enough with just...

I am working on an animal vocalization study and I need a clarification about acoustic impedance. All of the sources I have gone to are a bit too technical for me, so if you would be so kind to answer my question I would be very grateful! My question is this: What happens to a sound in high...

Hey everyone! How can i learn the basics of electrical engineering? Specifically, I'm interested in building guitar stomp boxes. I've looked at them and random schematics and it can't be THAT hard, at least to copy existing designs. And, although, I really want to get started and get that first...

Supposing we have an RC circuit (see figure) As we increase R, what will happen to the visualized signal of E and V(capacitor) and V(resistor)? And a general question about measuring the (Tao) [the one that equals to RC] BUT FROM THE OSCILLOSCOPE.. They mentioned it is the time for...

In a Black Hole, is gravity the only force drawing matter and energy into it, or deep inside at a minute scale (3 femtometers), is the Strong Force also operant ? Bonus questions: 1) Would it be true to say that without the Strong Force, there would be no matter? 2) In the "splitting of the...

If you apply tremendous force to water and cause extremely high pressure, it should compress and the temperature should go up - but if the heat is given away to the surroundings, does the water temp continually go up to match the surroundings? does the water temp go down underneath the...

I know that light can, because otherwise black holes wouldn't exist. But can sound fall? And are there any effects caused by this. By doing a rough calculation, if sound could fall, sound would have a maximum vertical range of about 5km. Do we see this in real life?

This is my first post and I'll admit I probably don't even know enough to be dangerous. Any how what I have is a a 3' long 6" dia tube that is functioning as a muffler for a boat. It has two 4" dia inlets mounted perpandicular to the length of the tube at 28" on center and two 4" oulets mounted...

Can anybody name 10 effects of light ??

Why does a body accelerate when it experiences a net force? Is there any change in molecular state of the body when it experiences a force?

An electron is enclosed in a large rectangular box. Considering gravity, estimate the order of magnitude of the thickness of the layer that is occupied by the electron at the bottom of the box. I thought about this for a long time and I really have no idea how to proceed. Any thoughts?

Introductory Story (feel free to ignore): In the summer of 2011 I realized my hairline was receding to unmanageable levels even though I had just turned 20. I searched for drug treatments and finasteride came up as clearly the best choice - almost every study showed it was significantly...

Hello. I'm trying to write a book of fiction about a place where there is a moon much bigger than the one we have. The mass is probabbly at least double the one we have here circling earth. It could probably be called a case of double planets. My question is: How would the planet be affected...

At what altitude does a solar panel see a noticeable increase in wattage/cubic meter if it is lifted into the air? I understand the maximum is a bit over 1 kilowatt/meter2 at sea level (not actually converted to usable energy, this is much less and depends on the technology) but that this...

Homework Statement Please go to: http://web.dsbn.edu.on.ca/~andre.huyzers/FOV1-000DC3EC/FOV1-000DC3EE/Lab%20Centripetal%20Force%20.pdf?Plugin=Loft Evaluation Question (E) Homework Equations The Attempt at a Solution Well I was thinking that as the frequency of revolution of...

sorry if this thread is in the wrong place.. basically it's to do with electro magnets.. can you control the strength of them by something like a pedal? as in if you gradually push it the strength gradually increases? also would it be a health risk if you were right next to electromagnets...

I consider myself very well-read on the phenomenon of thin-film interference: how it works, how it's used in lens making, etc. HOWEVER... there's one thing I don't get: Thin-film interference only occurs for one specific wavelength at any given point (according to all the sources I've read)...

I often hear something to the extent of, 1) "despite cosmological expansion, small-bound objects do not expand." and further, 2) "things like galaxies will aways remain bound, and will not expand." Pertaining to 1) Because cosmological expansion is a coordinate property, don't small scale...

Hello I am a first year Mechatronics major (yes its a real major), and currently looking into the effects that magnetic and electric fields have on combustion. I have a few questions. 1) Concerning the electric field effects are the ions carried on the wall that carries the corresponding...

Since we have such a strong magnetic field around the earth, why does it not interfere with smaller magnetic fields we use such as medical equipment, radio wave progagation and other things that creates an magnetic field ?

I'm trying to calculate the heat loss of efficiency due to increasing the mixture of propylene glycol in a heat transfer fluid compared to water.. For this I'm saying that water has a heat transfer efficiency of 100% (relative only) Im looking for multiple data points to create an equation...

In my textbook, it says that impurities lower the melting point and increase the boiling point. But is this only true if the boiling point of the impurity is greater than the boiling point of the solvent, and the melting point is greater than of the solvent too? So essentially, if greater...

Hi all let suppose a charge is in oscillating (e.g antenna),it broadcast wave,and also suppose an observer oscillate , so the observer had saw the charge in fixed distance so we have not magnetic field. what we could say about the energy that the observer recived?

A mathematical statement of energy conservation can be given using the continuity equation in terms of the total energy \frac{\partial}{\partial t}\iiint_V\epsilon dV+\iint_S \epsilon \mathbf{V\cdot dS}=0 where t is time, V is a velocity vector, V is the volume of the system, dS is a point...

Homework Statement I trying to learn general relativity and ran into a few questions while learning about the expansion of the universe. I found a really good intuitive explanation of the expansion of the universe here: http://curious.astro.cornell.edu/question.php?number=274 However...

A recent investigation was carried out where we varied the amount of water in the fermentation process. What effect does water have on the fermentation process? And why does this happen? What will happen if we put very little in, or what would happen if we put heaps in. We are looking at...

Since particle accelerators need to be a cyclical structure in order to generate the collisions it has associated to it an angular momentum. Due the conservation of angular momentum we use the rotational kinetic energy of Earth itself to supply them. Take, for example, a particle accelerator...

Not a question from a college course or anything like that, but one of interest to me:) You take a car tyre made of polyester and rubber, the treads are cut to about 7mm deep, the roads coefficient of friction are normally about 0.7 in conjunction with contact of the tyre, if the weight is...

If I had an infinite slab of mass and it had enough mass to become a black hole, would the event horizon be infinitely far away. Because the G field would be the same value at any distance away from the slab.

When dissolved in water, which of the following ions will form stronger ion-dipole bonds with the water molecules? Li+ or Na+? Both have roughly the same charge... Na has greater radius, but I don't see why or how that has any bearing on the problem.