Cause Definition and 572 Threads

As the title says, can there be any rotation if only one force is applied to an object at rest. For instance, if I had a rod laying flat on a frictionless surface, and I pushed one end, am I correct to say that Newton's second law says that all of that force goes into acceleration the center of...

That is probably a badly worded question but I understand electrostatics and I want to send simple but efficient radio signals. If I switch on a strong charge in one place it'll effect a charge away from it depending on "Coulomb's law". How is this equation expanded to explain more efficient...

I understand that reflection of EM waves is the electrons on the surface of an object being caused to oscillate, and transmission is the electrons all the way through the object being caused to oscillate. Why, in reflection, when the electrons on the surface of an object are caused to...

Carolynne Campbell, a rocket propulsion expert based in the Netherlands said that multiple warnings about the spacecraft s motor and fuel had been issued to Virgin since 2007. " I warned them that the rocket motor was potentially dangerous " Her warnings were related to the nitrous oxide and...

Why does an electron have a charge? Why does the thing which gives an electron charge give an electron charge? Does everything have a cause? How far can we go giving things causes? Do some things happen 'just because'?

Is it because the charges in the nerve are being pushed away from the compressed area, thus sending electrical signal along the nerve? Why was my post moved from physics forum to biology forum? This question could be classified as both physics and biology as I am asking about charges. What's...

Does the expansion of space cause cosmological red-shift or does EM red-shift cause space to expand?

Hello, Does anyone know if any companies working for good causes (water filters, disease control, agricultural improvements) in undeveloped countries have paid internships for the summer (if not paid, at least room and board). Actually I'll even take good unpaid internship opportunities. I'd...

What do you think? http://www.chicagotribune.com/lifestyles/health/ct-met-northwestern-als-breakthrough-20110822-story.html

I have the motion of a forced spring: $$x'' + \kappa x' + x - x^3 = \varGamma \cos(\omega t) \ \ \cdots \ \ (1)$$ and I am investigating the stability of its solutions with forcing period $T = \frac{2\pi}{\omega}$. I am given the asymptotic radius of the solutions: $$R_0(\kappa,t,\omega) =...

Hello Forum, I understand how fluorescence works: there is an absorption spectrum and an emission spectrum. The two spectra are shifted relative to each other in the sense that the absorption peak wavelength is different from the emission peak wavelength (Stokes shift). That said, fluorescent...

When an object is exposed to radioactive substance then ionising radiation is released. So a mutation can be caused due to radiation but does the object exposed to radioactive substance form an ionic bond? If so how? I heard ionic bond can occur only between a metal and a non-metal.

I apologize if this question has been answered before, but I did not find the explanation that I needed. If a torque is applied to a wheel situated on a frictional surface, what forces cause the wheel to roll? I know that if P is the contact point, the static frictional force counteracts...

Hi, I just started a course in drilling and the first chapter is about various situations where pressure drops in the drill string (pipe) causes forces on the pipe. I understand that a pressure drop due to friction causes a downward force on the pipe. The fluid is "pulling" the pipe down...

Everywhere I read about the angular momentum / spin of electrons and how a 1/2 spin particle has a unique characteristic that you need to turn it 720 degrees in order to get it turned back to where it was before you started turning it. How exactly do people "turn" an electron in this fashion...

I was teaching myself standing wave's chapter. It is said in the book that when plucking in the center of the string, it will cause two traveling waves of different directions, one left, one right. Then both of them will reach ends of string and invert back. Before they encounter at the center...

Homework Statement The photograph shows a device called a radiometer. The four regular panels are black on one side and shiny like a mirror on the other side. In bright light, the panel arrangement spins around in a direction from the black side of a panel toward the shiny side. Do photon...

Greetings all. Yesterday I was introduced to Tab for a Cause through Nerdfighteria. Tab for a Cause is a browser extension which raises a small amount of money for charity every time you open a new tab. It sets itself as your new tab page and provides widgets and such. Between 1/10th and 1/3rd...

my ans is f Y = 260hz. but the ans is f Y= 252hz . am i wrong? why? Since X is 256Hz., when sounded with Y 4 beats are produced, so Y is either sounding at 260 or 252Hz (+-4Hz). When Z is sounded with X, 8 beats are heard, so Z is either 264 or 248Hz.(+-8Hz). my fZ is (264Hz.) now the f Y...

I've read a similar thread, but I believe I have something extra to ask, so please bear with me. I've been thinking about friction(qualitatively) for some time now. I've not got a satisfactory explanation about the nature of the frictional force yet. My physics professor says its due to crests...

I've thought about this a lot and have tried to find the answer but have been unsuccessful. In the event of the big bang did it inflate through spacetime without effecting it other than warping by mass or did it actually cause the spacetime to flow or move outwards with the inflation?

I have learned that a catalase increase may help feed peroxide and reduce gray hair but on the other hand human ageing states that its heme-Fe increases automatically overtime. These two "facts" really confuses me. Could you help me explain this ? Thank you.

Three questions, In a femtosecond laser, or any laser for that matter, how is a pulse generated from noise? how do the phases match up? we use modulation for this? if so, what kind? Also, how does a laser get self mode locked when you push it or 'kick' it from the back? what does this...

Hello all, I use an evaporation chamber at my lab every day. Basically, put some substance in the chamber, close it, bring it down to vacuum, and pump enough current through it to vaporize it where it deposits on a substrate. I've been using 175A to create a deposition rate of about 1...

Let's say we have two rooms in a mansion that have the same temperature. One of these rooms contains an indoor swimming pool. If the temperature outside cools down, will the room with the swimming pool "steam up"? Or will it rather be the other room without pool that does that? I'm thinking the...

So, I'm trying to study phase shift in an unbalanced rotating system (where "phase shift" means the resulting response of orbital motion lags behind in time/position relative to the force that's causing it) I know that conservation of angular momentum applies ideally in a closed system...

I am aware that when charged particles accelerate or decelerate, the particle will emit a certain amount of radiation. But since a charged particle will accelerate any time it goes around a bend in a circuit, wouldn't it radiate some energy when it goes around the bend? I thought that giving...

Atherosclerosis causes accumulation of lipids (cholesterol, cholesterol esters) within the intima of major vessels."Robbins and Cotran, 8 edi." says it is due to endothelial injury rather endothelial dysfunction,which leads to increased permeability, inc. expression of adhesion molecules...

Yeah sure, change in speed of light as it travels from one medium to another. But why does it affect the path? I mean, shouldn't the light ray just go in the same direction with a different speed? Why does it have to change its path?

So, there's a paper here that I'm a bit confused about. On pages 3 and 4, it talks about energy density magnitude and York time. What I'm a bit confused about, is in the article that linked me to it, the scientist makes mention of eventually generating negative vacuum energy. However, from...

Hi, For question 37 (attached), I found the length of hypotenuse to be ~0.21m by letting a2 + b2 = c2 which is simple enough. Then I let Fb = i L x B and since L and B are perpendicular this gives a force with magnitude ~0.3 N. Now, I realize the question is asking to find the respective force...

Shift workers beware: Sleep loss may cause brain damage, new research says http://www.cnn.com/2014/03/19/health/sleep-loss-brain-damage/index.html?hpt=hp_t2

I have become nearsighted after too much reading/computer staring. And obviously it is because my eyes are spending most time focused at <=80cm distance. Now my physics teacher said when in optics that nearsightedness was caused by the lens being permacurved, so that it could not flex back to...

Hi folks! I'll start by admiting that I'm a cockroach compared to Einstein or Hawking, and I think that due to Hawking's great mind, maybe he wrote the book in a way he found conspicuous. But I don't have Hawking's IQ, and for me is definitely harder to understand the concept of "Time...

Ive been doing some engine testing at university and have created some torque, power ad BSFC curves. The engine used is a JCB 4.4l twin turbo diesel engine. I then compared to my results to the manufacturers graphs and got these. I need some ideas on what could cause the difference in torque...

I was just thinking about food and realized the taste of food doesn't really mean much to us. Just putting food in our mouths, tasting it for however long we want, and then spitting it out, we don't get much pleasure out of that. The majority of the pleasure of eating tasty food comes from...

Newton second law of motion states that acceleration is produced when a force acts on a mass. The Higgs field (mechanism) is the cause of fictitious forces?

Physicians recommend that people with anal fissures take a lot of warm baths. Physicians say that if a person's anal sphincter is spasming (which causes a great deal of pain), a warm bath will cause the anal sphincter to stop spasming. If I did not post this sentence, someone would...

I have an anal fissure. When I have a bowel movement, I don't feel any pain while I'm having the bowel movement or even a few minutes later. I start to feel pain about 30 minutes after the bowel movement. I have researched this on the internet, and I have discovered that my delayed pain after...

If the effects of gravity are relative to an objects stress-energy-momentum tensor, is the equation: Fg = Gm1m2/r^2 fundamentally flawed since it is based off the mass of the two objects? Ignoring the "gravity isn't a force" (I understand that it is what is observed due to curves in spacetime)...

Voltage as the "cause of motion" of charges? I know voltage is defined as the potential energy difference per unit charge between two points A and B. In textbooks they often describe this potential difference as the "cause" of current through a wire. Further, if this potential difference gets...

So I've been spinning my wheels (I guess I should say slipping, haha) on this problem we've been having We have a coupling intended to transfer torque: One side of the coupling is a smaller insert that slides inside of a larger nut. The insert has male threads on one side and the nut has...

If you are not familiar with Morgellan's, it is a disease where lesions appear on the skin, and then weird fibers begin to grow out of the lesions. Some in the medical community seem to think it's a hoax or a self-induced condition due to scratching and such, and that the fibers are just...

I know that Cold Air is more dense than the warm air, so for example: If a car was accelerating facing a hot air, it will face less air resistance. But if it was facing a Cold air, it will face more air resistance because the cold air contain more mass per volume for each particle. It will face...

Not sure if it is the right forum, but anyways, In this image, the sun is to the left. What causes the glow at the middle?

Hello, I am currently working on sputtering method for thin film deposition of III-Nitrides. The target used was a gallium nitride (GaN) plate and plasma generation was achieved by radio frequency (RF). After running the sample through phase analysis, interestingly a gallium oxide (Ga2O3)...

Hi, If I were given a whole-body X-ray dose daily for many days (a year for example) What would be the highest dosage per day which would result in an increased cancer risk but no noticeable signs of radiation poisoning by the end of the year, or during? And also, I've read that a 2KRad dose...

I found this my mistake, it's amazing how for a very short period of time, Xray(and other lasers) can demagnetize a ferromagnets. This is still under research, but how can this be? Can anyone share what they know about this? Do you all think this is an effective method? Could it be more...

I was wondering if you were to use the em field caused by electricity flowing through a wire or coil to push a magnetic or object would you effect the flow of power in the line. Like if you were to wrap a one phase of transmission lines around a solenoid type device to use the em field to push...

I came across this statement by bhobba in another thread and it got me to thinking, if the "environment" itself is capable of collapsing the wave function, then how is it possible to produce an interference pattern in a double slit experiment? After all, the particle isn't traveling through a...