Physics

Could gluon behavior help explain space curvature or gravity? I am reading lots of stuff and getting in over my head a bit.

Hi everyone, I hope my simplicity isn't frustrating for you all. I just have a few questions: 1. When a power source gives energy to the free electrons in the current, do these electrons turn from a negative charge to a positive charge? 2. Where do the free electrons come from? Am I correct in assuming that they are in the wires and the volts from the power source energise them to flow? Ar have I got it completely wrong and they actually come from the power source, along with the volts? thanks in advanceeveryone!

Light, magnets emitting photons ?? If Magnet emits photons and light bulb also, so why doesn’t I see the photons emits from my magnets. In a florescent light the ultraviolet are converted to visible light thanks to the inside phosphorus coat. But 2 types of light bulbs doesn’t attract or repel each other, if its emitting photons just like a magnet does

I have vaguely read from some crappy sources that some Gas Turbine Engines have multiple chambers. I tried searching all over the place for this stuff, but the whole freaking internet has nothing on it. If ANYONE has any bit of information on the design/how they work/non-vague diagrams/ ~anything~, please tell. This stuff is really really really really really really really really really really important to me. Help is very very very very very very much appreciated. Thanks thanks a lot lot!!!!!! !!!!!!

Why is the gravitational field of the earth is larger when one is located at the equator than located at the poles? I know that rotation accounts for it, but why does rotation affect the earth's field strength? It doesn't make sense to me when we put a stationary object just above the earth relative to the sun, the gravitational field of the object changes a large amount when compared to the situation that it is in contact, rotating on the earth.

Hello Scienceforums.net, I am why06 from SDC (space.com) This may sound a little weird but I am seeking help from many different scientific communities to answer a question that is baffling us at SDC. About three weeks ago I started a thread in SDC in the Space Science & Astronomy section. It was about a possible substitute for dark energy and matter dealing with tachyons. I am not here to discuss this though. No this hypothesis can be saved for another time. My question is one dealing with the physics of tachyons themselves. All of the minds put together at SDC could not figure this question out but perhaps YOU can.... Question: The question is not a…

Hi everyone, I am studying by myself at home, and this summer I am sitting my gcse sciences. I have to do coursework at home, and I have no idea what to do - any ideas anyone? I have no science equipment, I am prepared to buy some but I guess there is a limit to what I can buy? Anyone any good ideas for a good experiment which would give me the potential to gain top marks that I could do at home? thanks in advance everyone! Marc

Hi, I saw a thread on SFN a couple of months ago that had links to complete video lectures on College-level Physics, but I am unable to find it now. I searched the entire forum but I did not get anything significant. Does anybody have any idea about it? Any help would be greatly appreciate, thanks!

A ball is thrown vertically upwards. It rises, falls back down, strikes the floor and bounces back up hwere it is caught at the same position of that it was originally released. Assume that no energy is lost when the ball hits the floor. If anyone can help the aforementioned is to be graphed, but by no means am I asking you to do it for me. The problem is that the graph has to have a scale. Now, I figure a velocity time graph would start above the time axis, to come in contact with the time axis, to go below the time axis, to return back to the time axis, and then would end above the time axis. I am also given the initial speed (10m/s), where it is released (2m above …

Hello, Im trying to make a ball and socket wheel at the moment as a little project. It might be used to sit on but do not know yet , all i know is that it will need to take quite a bit of weight. What i thought of doing is getting a cup shapes piece of metal with a ball inserted just over half way into the cup and then with ball bearings inside the cup to help the ball move around . The only problem i can think of is that the weight is going to damage the ball bearings and dirt is going to get in from the ball and onto the ball bearings and clog them . I have thought of a solution for the weight problem by simply inserting a larger ball bearing into the top …

Well, I've heard and been told many times that superluminal (faster-than-light) communication is impossible. However, I have several thought experiments that I've been considering for a long time, and need others to confirm/deny as to whether they are possible. I'm not saying these would be feasible is sending large amounts of useful information, but would bypass the laws restraining information from going FTL. First, simply use a super-hard or dense material in the shape of a long rod (such as diamond or nanotube structures, so it wouldn't bend or compress itself in the process) and span it over a long enough distance to accurately measure (several hundred feet wou…

i have a rechargeable battery (1.2v, 2000mAh) and a charger with output DC 1.5 550mAX4 In how much time will the cell be charged. Please give the formulas and calculations:confused:

I only recently started reading up on general relativity , and read about the gravity probe B, which is an experiment to test Albert Einstein's theory of general relativity, particularly the effect where space and time get pulled out of shape near a forcibly-accelerated or rotating body in a phenomenon referred to as frame-dragging. It was launched on April 20, 2004 and took approximatly 17 months for the mission to complete. on 10.03.05 The probe completed data collection. And it will take about 1 year to analyse all of this data. If you wanna know exactly what Gravity Probe B mission is read up on wiki HERE But anyway , who hopes that Einsteins theory of …

What if you were to conduct an ABSOLUTELY identical experiment inside a vacuum, say... flipping a coin. With everything exactly the same... would there be any difference in the results of the two experiments? This question has een bugging me for years.

So, I've been wroking a lot with graphs this week, which seems to be leaning towards Newton's Universal Law of Gravitation. We have done many proportionality, but derving the formula has proven to be very difficult. I'm not sure of this means anything to anyone, but its work the try anways. After a series of three intense self-hand made graphs I was able to develop two proportionalities: one which related Force versus Distance, the other relationg Mass versus Distance. My proportionality statements are the following in order of how I just listed the two: F is directly proportional to 1/Δd^2 and M is directly proportional to Δd^2. Eventually, I found my constank (k), and w…

Hi, I have a primitive understanding of physics overall though of course I am interested in what it studies. I have a couple questions I was wondering if people here could clear up for me simply because I think I am just confused on what is being said really. What is the relationship between the laws of conservation such as mass and energy and how a black hole functions. I have read up on Stephan Hawkins’s and I was just wondering if his idea as originally put forth would break such laws. Also, when viewing atomic structure and related properties I came to wonder it time and energy(no specific form) have any relationship overall.

Just curious.. but is a person wearing full plate more susceptible to electricty, or will it act as a Faraday cage, counterintuitively decreasing the amount of electrical current flowing through his body? Furthermore, will other metallic armour work the same way to a lesser extent? (I heard rumours that chainmail is used this way) As a side note, please relocate this thread if it is in the wrong category. Thank you.

About Coulomb's law, it only works for a small test charge. I am not perceptive of this part. Does it works for a conductive sphere? I found many questions in my book employing this law to calculate the answer where it involves not only a small test charge but also a sphere.

its been many years since i studied physics and am having trouble getting my head around the subject of heat retention in materials. i understand that the specific heat capacity of a material is the measure of energy required to raise 1g of a substance by 1degreeC. If the amount of energy required to change a materials temperature can be calculated by /\Q=mc /\t does this mean a material with a high specific heat capacity is a good insulator? does this also mean that an insulator is good at retaining its heat?

I want to build a Thermopile to generate usable electricity with a heat source, like a small fire or something, I can build something like this but, I only get 1 mA and an ant of a volt. And it subjected to 1700C blow torch, it sucks. So does anyone have some info about that, would be nice, to light a candle and then your able to watch a DVD

As the title says I am a biology student I want to understand string theory and all the controversy behind it. String theory is a model of fundamental physics whose building blocks are one-dimensional extended objects (strings) rather than the zero-dimensional points (particles), I understand what this says, but I don't understand how this would apply to real life or how would change the current understanding of our universe. Please try to explain in general terms, with minimal use of complex terminology, when it comes to physics I'm dumber than a sack of bricks.

Hi, Given: v=40 cos(100pi t + pi/3) Question: what is the min number of msec that the function must be shifted to the left if the expression for v is 40 cos(100pi t)? therefore I have the equation: 40 cos(100pi (t+t0) + pi/3) = 40 cos(100pi t) hence, 100pi (t+t0) + pi/3 = 100pi t However at that point I decided to check the answers making sure I was on the right track and I was not. According to my book: the equation to start was: 40 cos(100pi (t+t0) + pi/3) = 40 cos(100pi t +2pi) with the 2pi we end up with a t0 positif but the way I did it, t0 is negatif. Is that the reason why they added the 2pi ? Thanks for your answer(s)

Hi all, We've just been studying the Hall Effect and it was noted that magnetic field detectors which use the Hall Effect are based on semiconductors. Is there any specific reason for this? All I can seem to find is that the voltage measured for semiconductors is much larger, and from the Hall Effect equation V(H) = IB/net this would indicate that a larger B field could be measured...

OK i've stumbled upon this link http://www.metacafe.com/watch/400937/candle_power_who_needs_batteries/ Seems interesting, from comments it works on the principle of Jakob's ladder. Or does it? I've tried it, doesn't work, am I missing something, or is fake?

Hello everybody. My name is Yanir and I'm from Israel. Before I begin I want to apologize for my shallow level of language. I have an idea to build a portable slide projector which made up of a flashlight, a transparency with a picture on it, and a few lens. The point is- that I'll be able to show some pictures on a wall with this portable flashlight. There is an example of the idea- http://img204.imageshack.us/img204/4647/dsc01895uf1.jpg I hope that you can help me. THANKS!