Physics

Is it totally true, that when Newton's second law (f=ma) is violated, a heavier object when pushed would accelerate at the same rate as a lighter object with the same force? Now don't get me wrong, I do know that physical laws cannot be violated.

15 years ago when I was a physics student I wondered whether for a coil with a dc current flowing through it the energy contained within the resultant magnetic field is equal to the kinetic energy of the electrons flowing around that coil. Since then Ive worked in sales and computing, and have forgotton all my favourite theories that would have allowed me to calculate it. Does anyone know the answer?

Hmmm... so my AP book has one equation in the book for the current through an RL (resistor, inductor) circuit but I can;t seem to get the same result. I went through solving the differential equation with respect to I however I end up with the result 1/R(V-e^(-tR/L)) instead of the standard I_max (1-e^(-tR/L)) by any chance could someone oblige me and derive the solution for the current in an RL circuit?

If we expressed a system's momentum as a scalar (e.g. added up all of the |mg|'s), would that quantity be conserved? What if we turned energy into a vector that points in the direction of a system's momentum [e.g. (1/2)mv^2 * (mv/|mv|) ] ? Would that vector be conserved, as momentum is? Just curious, because it seems that we could easily have defined an "energy vector" or a "momentum scalar."

Hi, I just had a few questions regarding quantum computers AND charges.... Are the quantum computers same as the magnetic computers? If they are not, then do they have any similar property? And what is the orientation of binary language in magnetic computers? How do we know whether the electroscope has a positive or a negative charge, and how can a human body induce a charge since it's neutral. How working against friction charges a body, what's so special about friction in this case? And why would something light up as it gains enough charges? Thx.

I have finally gotten the inverter to work. It seems that there was a minor wiring error. I'm not completely sure what was wrong, since I had everything wired correctly, but when I resoldered a couple of wires (which still had solid connectivity), it worked. Maybe it must have been a minute resistance error? Anyway, there's a new problem . The described circuit is meant to handle 300W, but it seems way to weak. I've tried a laptop charger plug (nearly 90-100W) and it barely powers it. When I connect a 100W soldering iron, it doesn't even heat. Why? Also, I notice the resistors seem to heat up pretty quickly. Sometimes it's the small 180 ohm, 1W resistors, other …

When I studied about Casimir effect of attractive force, analogous to 18th century French sailors:"Where two ships are rocking from side to side in conditions with a strong swell but light wind, and the ships come closer together than roughly 40 m, destructive interference eliminates the swell between the ships. The calm sea between the ships has a lower energy density than the swell to either side of the ships, creating a pressure that can push the ships closer together." http://en.wikipedia.org/wiki/Casimir_effect#Analogies Drawing from above observation, I come out two conclusions: -constructive interference causes repulsive force between objects on the wave …

What is the propagation speed of radiant heat?

How does heat radiate ? What is that emission of heat ? Is it some sort of rays, electromagnetic waves, particles, molecular vibration ? A body placed between a radiated heat source and its target can block or absorb it. What is actually traveling trough the air from the hot body to the being heated one ? Miguel

From my understanding , the speed of light that we all talk about when saying, nothing can travel faster then that speed, is the speed of light in a vacuum. But if i read correctly, light slows down abit when ever it travels through any type of material ei Air, water, or a diamond. So whats the material that can slow down light the most? And is it possible to make something eg an electron to travel faster then light, under such a condition? Any effect?

I have witnessed strange things happening in my non-stick teflon coated pan: When i put a cold substance (hamburger for example) in my 35cm teflon pan filled with a thin layer of olive oil (did not try other oils results may be same) the oil retracts from the cold substance in about a 20cm wide circle. Leaving the bottom of the pan completely free of oil. The pan is perfectly flat and horizontal, the oil forms a nice evenly spread layer before i put something cold in. How is this possible? Sorry if anyone finds my english a bit strange, i'm from Holland.

Does time travel violate the 2nd law of thermodynamics? If you go back in time, you're taking matter out of one time period, and adding it to another, right?

It seems I've gone through 6 Transistors (should have used fuses!) with my circuit. Can someone explain to me why it's not working. Here's the diagram: http://www.i4at.org/lib2/inverter.htm Here's what I've used in the circuit: I've used resistors with 5% tolerance. The transformer is 300W The diodes are FR155 (should be equivalent to HEP 155) I have used heat sink to secure the transistors (so as to avoid burning them out) and confirmed they work before running the circuit I've observed: A small spark at the battery's mains when I connect it, and thereafter it no longer sparks (something's blown thereafter). The current voltmeter on the output end show…

I've been experimenting with capacitors (50-100uF from camera circuits). I'm wondering how I can charge a capacitor. I can't just plug it into a source of EMF, I probably need to design or find some sort of circuit, right? What's the best way to charge metallic objects? I don't have a Van de Graaf machine and can't produce enough charge by induction by rubbing two materials. Can I use a capacitor to charge metallic objects?

Hello all... Two identical air compressors in series, both running at the same rpm. But the second in reversed flow, as to force expansion of the air compressed by the first one. ¿ Will there be pressure in the pipe joining them ? A-------C~~~~~?~~~~~E-------A A= atmosphere C= compressor ?= is there pressure in this joining pipe? E= expander (reversed compressor sort of a vacuum pump) ------ = pipe ~~~~ = radiator or finned pipe or cooling coil Anyone remembers ROVAC ? Miguel

alright this may make me seem very arogant, but a few days ago i was kinda inspired by my science teacher ( i am only 16) to look into something. I was wondering sence it is not theoretcly possible to create an absolute vacuum, and use the energy created to power the field if it were to become unstable. could there be a way around that, maybe creating enough anti matter in magnetic field, that the field become a vacuum. Thanks for putting up with my lack of knowlege (and bad spelling)

Imagine that there's a complete circuit except the front is left open, so it is an open circuit. The two ends of the wire are metal plates, similar to electrolytic cell. There's a 2200V voltage connecting in series, just like a battery conecting in series. There's a steam of alpha particle shot to flow perpendicular to the plane in VACUUM. Is there any current generated? What about using beta particles (a) in air (b) in vacuum?

http://www.aip.org/pnu/2006/split/767-3.html?source=rsspnu for comparison the temperature at the center of the sun is calculated to be 15 million kelvin in this experiment a temperature about 100 times hotter than at the center of the sun was briefly produced

I do not completely understand it. I see how, if fluid is running though a pipe, the pressure decreases as the radius decreases because the acceleration of the fluid requires the unbalanced force of the pressure differential. What I don't see is why the pressure must decrease absolutely (instead of relatively) as the radius decreases. For example, if you have a pipe with water flowing though it, and you add a narrower pipe to the end, it seems that the pressure in the larger pipe would increase. I'm pretty sure it would, because you can do the experiment with your mouth. Hold your mouth wide open and blow air out, then close your mouth almost entirely, and your ch…

As you must know from my other thread on inverters, I'm trying to build one. I'm having difficulty in finding all the parts, though. Using the simplest inversion circuit I found (http://www.i4at.org/lib2/inverter.htm), I have purchased all the supplied I need except the silicon diode of model HEP 154. I've checked all local stores and none seem to have the exact part. I've been told 1N4004 is can replace this part and should work by some. Others have said 1N4007 is needed. Due to my inexperience, I'm not sure what to get. I want the circuit to work well, but can't find the right part. From my understanding, the purpose of these diodes in the above-linked circuit is to dir…

Okay, so I've been designing an inverter. I've purchased all the components and designed the circuit as specified by this website http://www.i4at.org/lib2/inverter.htm Unfortunately, it doesn't work. Possibly for these reasons: 1. Initially, I mixed up the base and collector of the NPN transistor (2N3005)in the circuit and ran it. I didn't hear any popping and didn't get any voltage out of the converter. Though, at the beginning I got about 8V from one of the terminals and the center tap. Maybe this blew the transistor? 2. I mistakely broke off one of the terminals of the transistor and had to resolder it on. Thus, I might have overheated the terminal and transis…

I've opened up several transformers and have just found coils and metal (I think Iron) rectangles. The voltage IN is transformed to a different OUT voltage based on the ratio of the number of turns on either end. I'm wondering how frequency is adapted? Does the transformation also alter the frequency? I'm speaking specifically of transformations between 120VAC and 240VAC. The frequencies are different between 120V and 240V appliances, so a simple voltage transformation probably wouldn't suffice? Can someone help in explaining how these frequencies are altered?

How can I build an AC-DC inverter. It should convert 12V DC to 240V AC. I'm trying to build a backup power supply which can handle 2-5A of current drawn. Anyone know of a simple circuit which can handle 2-5A?

http://www.foxnews.com/story/0,2933,189909,00.html Guess its time to create new laws? What does this all mean?

How can i levitate a magnet?