Physics

I'm just reading about these 2 forces but I'm not really getting the difference Electromagnetic force is about attraction or repulsion between the nuclear particles of atoms, but the then what's electrostatic force? What's the link between these 2 forces and Coulomb's law: F= kQ1Q2/r^2? Please Help I'm really confused:-(

I am under the impression that a wind turbine generates lift because the rotor blades move through the air. At the blade tips, the speed by which the rotor blades move through the air, is much greater than the wind speed. However, I fail to see how the incoming wind adds to the movement of the rotor blades? Also; can wind turbines start by them selves, or do they need a certain jolt of energy (sort of like a starter on a gasoline engine) to begin converting wind power into lift?

building a 6cm in diameter rocket out of KClO3 and sugar would like to know if anyone can tell me a good metal to build it out of, thought aluminium would melt to easily. have some stainless steel but that is quite heavy, any ideas? also side note in the amateur science section why not have a help section rather than just completed projects so i would have somewhere to put all of my annoying posts:-)

if you had a tube with a piston in the center,and you put valves at each end of the tube so when the barometer is high air is allowed in one end of the tube and out of the other end when the barometer is low, would the piston move?

Is it possible the Lorentz force regulates a the ground state in hydrogen.. If no, why not? Using the Bohr magneton it seems some atoms actually have pretty strong magnetic fields, which could have enough force to be a "ground state" energy source/regulator.

Can somebody explain to me how kinetic energy can be calculated in an electrical field? Is the kinetic energy that of the charged particles in a current? What are the particles?

i realized recently- light travels at different speeds through a vaccum, air, water, glass, etc. which is why optical lenses work... if you were to shine light through a very dense, yet clear compound, could you actually see the light progressing from side to side? and would it be like after you turn off the light it would still keep shining for some time?

What makes the Loud Speed Glue "TOCK" noise? In table tennis there are ping pong rubbers that involve a thin 1-2mm membrane of closed cell foam (Like Neoprene). Well this foam is between the wood paddle (blade), and the rubber outer layer(topsheet). Well there's this practice called "Speed gluing", which involves applying fresh coat of rubber cement on the foam immediately before playing with the paddle. This is done to increase the spin and speed and is done by many professionals as well as by club level players. Chemicals in the glue are believed to be the cause and include solvents such as toulene, heptane, and trichloroethylene (The chemical found in REMA…

correct me if i'm wrong but i am under the impression that, put simply, in a van de graaf generator the belt gains electrons from the positive terminal and then the large dome gains electrons from the belt. if it has all these electrons (which have a negative charge), does this not mean that it would gain a negative charge? I'm just confused because on all the diagrams i have seen they put positive signs (+) around the large dome.

I awoke one morning to the following train of thought. It isn't exactly precise or clear atm, but it does have an interesting perspective to convey. Given the amatureism that it was born in, please excuse the lack of sources and etc. in favor of the concept itself. I will continue to work on this as the thread matures. ...An observed experiment is thereby limited in its human expectations of the result. This is due to the fact that observed material (matter and reactions) are altered when in an observed state. The sub-atomics will react within a perceived limitation. How then, can you get effective results? The results you do achieve will be reasonably correct, bu…

Is it true that the Earth's magnetic poles switch at some intervals? I really don't understand that.

Why is earth still so hot? According to scientists, Earth is about 4000 million years old ball. If this is true, and I'm sure it is, then WHY is the Earth still so hot??? I mean Earth only has a very thin crust of cooled down matter, and below this, there is molten magma that is really, really hot. Why is the crust not thicker? Why has the earth not cooled down completely, to a ball of solid rock??? What has kept the Earth's innards so hot all these millions of years??? Why has not the very cold ice ages quickened the cooling down process??? Is it the warming presence of the sun or something??? Please help! I'm deeply puzzled!

What exactly produces thermal radiation? I have learned, that if atoms move faster, they radiate higher frequency electromagnetic wave. But how can electrically neutral atoms produce EM wave, if EM waves are produced by moving charged particles? I know when electron drops from higher orbital to lower, it radiates a photon, but isnt that exact spectrum? Does atom higher speed just increases chance that it will have an electron change orbital? Are these wide spectrum EM waves are produced cause electrons are never separated around the atom evenly? Or when atom changes its direction, the massive nucleus moves more to one side of the atom and separates the charg…

A Lithium ion with a mass of 1.16 x 10^-26 kg is accelerated through a potential difference of 220 V and than enters a magnetic field with magnitude 0.723 T perpindicular to the path of the ion. What is the radius of the ion's path in the magnetic field? My gut is telling me that I need to find the speed as it enters the magnetic field, from there I could find the radius easily. But I can't find the speed. How to do this question?

given the amount of speed of light questions here, this may have been answered already, in that case i apologize in advance. light moves at a speed of 670,616,629 mph... now, say you are driving a car at 50 mph, and you turn your headlights on- will light be moving at 670,616,679 mph? or would it still be moving at 670,616,629? or is it like soundwaves that it will become compressed and turn into a higher frequency? so if you're going faster than the speed of light, would you be shining behind you? and if you're going exactly the speed of light, would your headlights blow up from illuminating all their light onto themselves? i'm sorry, almost the same ex…

What are the interactions of x-ray of angstroms wavelength with matter?

i realized that antimatter could never be used very efficiently, because the great amount of power that is released when they annhilate matter is at most 100% of the energy required to make the antimatter. but they probably have very good energy density, and could be used as batteries... except i don't know, do they react with any matter they come into contact with? oh, and they'll be better then nuclear batteries. batteries that work on nuclear reactions might overheat.

me and a few other students in my class chose to take the oppertinity to do a uni course at school for free, and i just wanted to know what are some really basic topics i should read up on, and keep my self prepared and brace myself because i hear its gonna be psychotically hard

We have 2 nuclear sources each with activity of 3 Micro Cuiri. Now we mix these 2, wha's the total activity then? Pretty simple question but not sure if the answer is 6!

Where can I find physics resources(high school)? for example,vectors,motion,momentum,work,energy,kinematic equations and so on... please online:)

I hope that you find this interesting. It is a long read but it is very real and I think it will be worth it. I believe that I have found the key principle required to tap the vast supply of free energy that is all around us. If I am correct (I am pretty sure that I am) then there will be a shake up in the science community of some magnitude. I am putting this document in the public domain so that others can use and expand on my ideas. Your comments for or against, would be most welcome. Thanks, John "When a scientist states that something is possible, he is almost certainly right. When he states that something is impossible, he is very probabl…

In my neighborhood here in Texas we have the water flow valves to each house above ground, apparently due to some building code. This means that, of course, the valves freeze over the winter and start leaking water everywhere. So, a question: Suppose I were to take a very strong pipe and freeze the water in it. Would it break just as easily as a weak pipe would, since water will expand as it freezes regardless of its container, or would it withstand the force? I was thinking two things could happen: the strength of the container would mean increased pressure on the water as it started freezing (since it would try to expand and fail), meaning more energy would be r…

I have a question for you, and would appreciate your feedback…. Would a large military submarine, whilst travelling below the sea surface, affect the Earth's geoid, enabling an extremely sensitive satellite based gradiometer, to detect the anomaly caused by a submarine, in comparison to a high-resolution reference map of the geoid? The submarine would most probably be at neutral buoyancy, with depth adjusted via its control surfaces. Rune Floberghagen, Esa's GOCE (Gravity field and steady-state Ocean Circulation Explorer satellite) mission manager explained the sensitivity of GOCE as follows: "Imagine a snowflake, which has a fraction of a gram, slowly fallin…

I was was just wondering about what would happen if a signal was being transmitted toward us from a transmitter moving at 0.5C. Could the final velocity of the signal be 1.5C. Einstein did state that no matter how fast you are moving, if you turn a lamp on the light will still MOVE AWAY from you at 3E08 m/s so if the transmitter was moving at 0.5C then the signal being transmitting would move away from it at 1.0C giving the signal a resultant velocity of 1.5C relative to your velocity. If this were to happen then the wavelength will be two thirds its original making its frequency 1.5 times the original, kind of like how the sound waves coming from an emergency veh…

Okay. So can anyone teach or explain to me the basics of physics. This isn't homeworks or anything, I am doing this for fun. For proof, all I have is that I am a freshman and we don't do Physics right now, which means this isn't homework.