Physics

Can anybody explain me in which direction the electic current will flow in a cunductor kept in a changing electomagnetic field as described below, A thin wire shape conductor is kept perpendiculer to the direction of field generated by an electromagnet. Assum that magnetic field is along the 'x' axis, conducter is placed along the 'y' axis now if we change the current in electromagnet coil or put the current on or off than it will change the magnetic flux and a current will be generated in conductor. We all know the fleming's low and lenz's law, as per my understanding of these laws, current can flow either in 'y' to '-y' derection or from '-y' to 'y' direc…

How many planets are in the solar system?

Hi all, So my best friend and I, were trying to figure out, how this strange picture was taken. It wasn't edited, so what do you guys think might've caused this result? http://tinypic.com/view.php?pic=11w979j&s=8 Please share your thoughts, answers are appreciated in advance

Hello everyone Just asking myself this question over and over again: Is every color we see the negative one from what it actually is? Light, colours as we see it, is reflected light. If white light falls on an object, which in its turn sends out light in that colour that we accept is the colour of the object, then it must absorb the rest of the white light - the negative of the reflected colourful light. E.g. I have in front of me a computer mouse which appears black to me (let's assume it's pure black - not very realistic, but hey, we're reasoning theoretically here). Black (or 'no light') is being reflected from it. No light is reflected, so all light must…

Some two yers ago I was designing a small, cheap electromagnetic clutch. I noticed that magnetic field lines would cross (radially) through a ball bearing, but I didn't expect much problems with that. However, it proved that the magnetic field increased the ball bearing drag much more than I expected. I had to redesign the clutch to include an aluminum ring around the ball bearing to provide some magnetic insulation (this increased complexity of the clutch considerably)... Until now I don't understand why did magnetic field increased the drag that much - forces involved by magnetic field were well under the ball bearing limit (normal mechanical forces of the same magnitud…

I wanna know what effect certain speeds have on the normal human body. So to start things off, what effects are there on the body when moving at 300 miles per hour?

Please give me links if you have them.

Satellite phones are rugged and used for businessmen going on safari for the most part, and run about the same as a regular cellular communications phone. Why are there not any companies seeking to integrate satellite communication phones in the same fashion that cells are today, technologically and economically (i.e. touch screens, contracts)? Are there any difficulties in infrastructure or ability that are limiting in this development?

Imagine a Ferris wheel on space, made of carbon nanotubes, the diameter of the wheel is about the distance between Sun and Earth, rotational speed is 8 RPM. So can the wheel go faster than light without breaking?

certain mass is attached to stationary spring balance, next the spring balance is subjected to very high upward velocity Will the spring balance show high reading due to increase in relative mass as a result of high velocity ?

Not looking for a vacuum. docs.google.com/viewer?a=v&pid=explorer&srcid=0B-C2IpG-te-Lblhhd2V2eEh6WUk see page 20. Does the FBI have this tech?

Hello everyone, this is my first post on forum. Im glad to meet all of you. I need video material about understanding standard model. Please post videos you like under this topic. Thank you.

Hi scientists, I'm ametuer Space Physics researcher, and I have a problem about making an equation; 'Strong Electromagnetic Force Offsets Gravitational Force' Is there someone can make this one? I will give you more information about this if you need.

Hello everyone I have a question I have stumbled upon.. well... playing with stuff. In my bathroom, I have some sort of cup with a chalice-like-shaped 'cover' (see attachment) The black boll is a solid metal ball at which I hold this 'cover'. The rest is, of course, hollow. Now, I've experienced something rather strange; when I tap my finger on the hollow, metal part, keeping hold of the solid ball, it produces a sound - rather logic. The strange part is, that the sound is extremely loud (well, it IS extremely loud when held less dan 2 cm from my ear) at the outer sides (outside of this 'chaliceshape') and there is absolutely no sound in this chalice shape. (So …

We know of people like George Zweig and Jocelyn Bell Burnell who, despite having very solid credentials and helping to transform physics, did not get the recognition they deserved. It would be great to know of other transformative thinkers/researchers who are still alive and are underfunded/unrecognized for whaterver reason.

Lets say you had a cup that contains 1500 cc of water at 60 degrees Fahrenheit and you dropped 300 cc of ice that was 30 degrees Fahrenheit. if the water could not transfer heat to anything else other than the ice at what temp would the water and ice reach equilibrium. I was wondering if there was some kind of math equation that i could use to solve this.

which thing oscillates in a matter wave like electric field and magnetic field in a light wave ? my brother told me that its a topic of quantum mechanics so it will be hard to under stand so would any of u please explain it in a simple way ?

I am looking for an information about the capacitance of Coaxial Cable, in which the inside part is made of a conductor and coated with a semi conductor, and the outside tube is made of a conductor material. Do you have any explanation? or Formula ? Attached a pic for the status.

Hi guys Everyone knows (or should know,) this pretty important formula: [math]y=y_0+x\cdot\tan{\theta}-\frac{g\cdot x^2}{2\cdot v_0^2\cdot\cos^2{\theta}}[/math] Now, I don't know if I'm physically allowed to do this, but I derived that, keeping in mind that every unit, independent of time, is constant: [math]\frac{dy}{dt}=\tan{\theta}\cdot \frac{dx}{dt}-\frac{2\cdot g}{2\cdot v_0^2\cdot\cos^2{\theta}}\cdot\frac{dx}{dt}[/math] [math]v_y=v_x\cdot\left(\tan{\theta}-\frac{g}{v_0^2\cdot\cos^2{\theta}}\right)[/math] Now, [math]v_{y,0}=v_0\cdot\sin{\theta}[/math] and [math]v_{x,0}=v_0\cdot\cos{\theta}[/math] Am I thus allowed (?) to say th…

After reading this article on how the magnetotail affects the moon when it pauses through, I have a question. http://www.nasa.gov/topics/moonmars/features/magnetotail_080416.html In what way could this affect the electromagnetic field of the earth? If the moon becomes charged from the magnetotail, would that in turn create a greater magnetic charge here on earth during those days the moon passes through it? Thanks for any insight into this.

Ok I understand the subject of this topic is rather brief but that is irrelevant I have a question or possibly a topic for debate does gravity pull you towards the center of mass or does it pull you towards the object? Now what I mean by that is better explained with a hypothetical example. Ok so you have a ring the ring is about the width of earth and stretches in a perfect circle around the sun but for this example assume the sun is not there and that the only thing is the ring now with mass there is gravity that isn't the question the question is that will gravity pull you towards the center of the ring where there is no mass or will it pull you towards the ring itsel…

Hi all, I am interested in learning about general relativity (GR) in a do-it-yourself fashion. To that end, I was hoping that some of you may be able to provide some advice on the following two questions: Am I missing any prerequisite knowledge required before beginning an introductory study of GR? Below is a list of college level math and physics courses that I completed during my engineering undergraduate days (a while ago, but reasonably confident I can brush up on the course material). A good introductory GR textbook - aside from clear explanations, something with lots of examples and worked through problems would be nice. Thanks in advance! Completed Relev…

I've been interested in the sciences for a few years (cosmology and astronomy specifically), however I have only started self tuition for a month or two. I know a little... But I am only 13 and need help on where to start! I am joining an astronomy club in september, and I am reading a few books. Also watching documentaries in my free time. How should I go about learning? And are there any useful websites/books etc. of which you know are good to start out in cosmology and other related sciences? Thank you

First off I am home schooled so don't bother saying I should focus on my current school work before I decide to jump in because I have tons of free time. Now, I am 15 years old and want to get more into Physics then I currently am. I would eventually like to end up studying Quantum Mechanics or Astrophysics, Yes these things are far off but the earlier I start the more likely I am to be better at it and find out sooner if I will like this for a long time. Thanks

Nothing can exceed the speed of light (as we all know). However, recently I have been drawn towards the theory of tachyons. Supposedly, they should exist beyond the speed of light and never be able to slow to reach it. Moreover, the particles would travel backwards through time. I don't understand, at all, if we were to detect them... How so? Tachyons would only exist for an instance, therefore there mustn't be a way to follow and detect any one of these particles. I am not particularly smart and am young so I just can't justify that even if they are there... Would we ever prove them? If so, how?