Classical Physics

If an electrically conductive permanent magnet is moved at right angles to the direction of its internal magnetic field lines, is a non-electrostatic emf induced across the magnet?

I've been reading through two old physics books about waves. Electromagnetic waves have an intensity that is proportional to the square of their amplitude. I = eocE2 W/m2 Where eo is the permitivity of space, c is the speed of light and E is the amplitude of the field. I'm not sure that i understand this, but in both the books it derives this result from a volume builit up from the wavelength of the wave and it's called the "unit volume". Does this mean that this intensity is only for the volume occupied for a particular wavelength as the wave passes through an area of one side of the cube? So that this does not show the whole picture because any wave should…

I recently got into a debate with someone on YouTube after I had commented on a quicksand video where someone drowned in it. I had made the point that the idea of someone drowning in quicksand is pure Hollywood nonsense, and he contradicted me rather rudely I might add. Correct me if I'm wrong. Whatever special properties quicksand (I'm talking about classical quicksand, not dry quicksand) might have as a non-Newtonian fluid, it is still a fluid, and one that is more than twice as dense as the human body. And as everyone learns in high school physics, if an object/fluid of density X is placed into a fluid of density nX where n>1, than that object/fluid will just fl…

Here's a problem that I found a solution for: How fast does the Sun travel around the Galaxy (Milky Way)? Find: v Given: radius from center of Galaxy to Sun, r (CS)=2.5E17 km, time it takes Sun to travel around Galaxy, t=2.5E8 y s=2(pi) x r(CS)=2pi(2.5E17 km)=1.57E18 km t=2.5E8 y (365 d/y)(24 h/d)=2.19E12 h v=s/t=1.57E18 km/2.19E12 h =717 258.6 km/h

I bought a whiteboard for our refrigerator with 4 attachable magnets on the back. They are rectangular magnets that I attached the magnets to the adhesives on the back, but when try to it attach it to the refrigerator, it can't even hold on to it! The white board just slides down the fridge to the floor. I guess I could get some stronger magnets to attach to the back instead. But, is there anything I can do to strengthen the magnets already there? What if I attached 4 more rectangular magnets to the back to the magnets already there, so say the North Pole side of the magnet sticking to the fridge would be attached to the south pole of the magnets I attach to them, an…

Hi all. Noticed lately that when turning a corner, the temperature of the air inside the car feels abruptly warmer [yes, am at the southern hemisphere right now, using airconditioner] Has to be that layers or portions of the air next to perhaps the windshield does not rotate 90 degrees and is clearly felt at the driver position, by the inertia of the air mass. If other reason, please explain. That brings the question of a housefly hovering in the car; would it collide with the front windshield on a sudden stop ?

Hello, here is semi classical formula for gravitational acceleration which perfectly predicts "relativistic" effects like precession of the Mercury. I have tested it by numerical integration. I can post very simple code of the program if somebody would like to test it. But I would be thankful if somebody would help to derive a formula of mentioned precession analytically.

Ok i'm writing a novel where my character tries to commits suicide by drowning himself. He ties his feet together, attaches weights to his ankles, tapes the rope so he can't untie himself and then jumps into the sea. I need to know how much weight will my character need in order to successfully drown himself and stay at the bottom even if he struggles. He is using metal barbell plates. How much weight will he need? Will 15kg (33lbs) be enough to keep him at the bottom? My character weighs 70kg (154lbs), he is 6 feet tall and not physically strong or good swimmer at all. (He couldn't carry the 15kg weights with his hands but used a backpack). The sea where he jumps…

I was wondering while looking at the Bernoulli schematic if you can produce a strong suction or vacuum at the entry of the schematic? For example: using a 6 inch pvc pipe in the schematic and inserting a 2 inch pipe a couple inches inside of the six inch pipe at the entry area of the schematic. Water would be flowing on the outside of the 2 inch pipe but inside the 6 inch pipe. Would there be a suction or vacuum area so that water would flow through the 2 inch pipe. If so, could I manipulate the schematic (dimensions of the outside pipe through bell reducers or differing the different lengths or areas of the schematic to increase the suction or vacuum power or energy.

Link removed. My ride needs a jump start , and I got to know if what I have to jump it will get hot as it most get to start my ride . So if you know math please help me out . I whant to go home . Ok useing 1.500,000 V. at 200,000 A. in a Zpinch on 1 L. of heavy H. and at the same time forceing the plasma inword with a speed of 27,000 FPS and a PSI of 1,500,000 WHAT WOULD THE CORE temp be ? Please help

I'll begin by making an opinion statement: I don't believe in the speed of light © as a universal speed limit. I say that with some caveats; I appreciate that the matter we can detect (which makes up about 4% of the known universe according to current understanding) has to obey relativistic speeds, and I appreciate that no light has yet been detected which exceeds the speed of light. My belief derrives from a seemingly obvious oversight: Our current detection methods are based on both light and physical particles (electron microscopes). So how would it be possible to detect something which travels at a much greater speed anyway? The theoretical 'tachyon' has a lower speed…

Greetings! I am not new to this forum, but forgot both my username and password because I had not been on in 1.5 years roughly. Aside from that point, my title states that I require assistance in building a particle accelerator or atom smasher. I was inspired by Michio Kaku after reading his book, Physics of the Impossible, and going to see him speak. He was able to able to construct a Betatron accelerator from electrical steel (Transformer Steel) and copper wire (of course other things were used, but it was his lack of funding that impressed me). He used 22 miles of copper wire, at what I am assuming is 30 gauge, at least, wire. It was wound into a power supply and used …

Discusses about time and space are always populate. Now I want to share mine. Once I tried to spilt time from everything. But I could not image time is alone without anything. So I thought time might be aggregated with everything. And then I thought in this way :" Time is created by everything. In another word, everything has its own time." Now it becomes the way I think of time. A funny view, isn't it? Can you share yours? I want to discuss it a little more.

Let me preface this by saying that I've just recently begun studying physics. Okay, so I'm wondering about electromagnetism. Since the photon is both a quantum of light and the carrier of the electromagnetic force, then how is it that the electromagnetic force is able to function in an environment where there is no light? If there was an absence of the electromagnetic force, then molecules and atoms would no longer hold together, which suggests that once the light was switched off in a room, matter could not exist in that room. The only explanation I can come up with is that there is another type of photon that is not emitted from a light source.

This might sound absolutely redundant and obscure to you, but I've been trawling the internet over and I just can't find anything at all! I get really hung up over these kinds of things and it has been bugging me for days. Hopefully someone's actually got an answer and I'm just looking in the wrong places. Or at very least you'll understand my perhaps poorly-explained question "If there are three lights casting separate shadows from a pole in the very centre of them, then why does the shadow which is closest to you at the time appear the darkest?" I'm actually referring to a typical ceiling light here, with three bulbs set around a central pole coming do…

Please Forgive me if this is not in the right section (I'm new here): The fact is that alot of novels and movies out there display impossible feats while simultaniously expecting you to belive that it is realistic. I would like to learn the above because i dont want to have to put in random numbers and expect any reader of mine to have to look it up to proove if its possible. The fact is I would like to have a character that can jump at amazing heights, but I have no idea what numbers to input when describing her leg str etc.Gravity and wind resistance are two factors in the equation, but i dont even know the equation lol . Help would be much apreciated T_T

Few years ago, we have known about the phenomenon that Coca cola is overflow severely when a piece of Menthos candy is put inside. I replicate this experiment, with a multimeter is used to measure the current. With my surprise, the needle vibrates to show that an electric current is generated. Could anyone repeat my experiment to find out that if I am wrong or not Thank you

Two plane mirrors inclined at an angle [latex]\theta [/latex] to each other, with an object placed between them will create [latex](n-1) \frac {360 ^o}{ \theta } [/latex] of images. Is this because of the repeated reflection of the images? Are we allowed to produce a mirror lengthwise to show a reflection of an object that would otherwise cannot be located? see attachment. go.bmp

I have heard that people or some TV shows saying that ocean wave is influenced or formed by the gravity of the moon.what is it really?

An osmotic membrane takes 1000 psigauge on the inlet side, and atmospheric pressure at its outlet side to perform its work. If the same osmotic membrane is left at atmospheric pressure at the inlet side; how many inches of mercury should be applied at the outlet to perform equally ?

Ok, so here's where I've got most of my information on it. This is part where I start to have trouble http://electronics.howstuffworks.com/radio7.htm So, does 98.5, Mhz mean that the wave oscillates at 98.5 million waves per second? Meaning it goes up to a peak then back to zero many times per second? What I don't understand is how you can put information on the wave. If you trasmitted at 98.5, it would just be that frequency, but a sound wave is totally different, it's frequency and amplitude vary quite wildly, not exactly at 98.5, how could you put that on top of a radio wave? This seems to help me a little bit. http://www.qrg.northwestern.edu/projects/v…

Hello friends, I would appreciate your thankful help in solving this problem on gravitation from an IIT practice paper:- A tunnel is dug in the earth across one of its diameter. Two masses m and 2m are dropped from the ends of the tunnel. The masses collide and stick to each other and perform SHM. Then amplitude of SHM will be (when R=radius of the earth) (a) R (b) R/2 © R/root3 (d) 2R/3. I will be pleased if anyone writes the concept used and explains the steps briefly........ a fresher to the `SFN` looking forward to a reply soon. Thanking You

Would this design work for a motor? Why wouldn't it (I am guessing that is doesn't since no one has developed this). Blue is the south side of a magnet Red is the north side of a magnet

Hi all, I have just read this http://www.bbc.co.uk/news/science-environment-16908004 Is this possible from that height? I would have thought that he would be slowed by the increasing air resistance before reaching that kind of speed?

My computer model has found geometries and frequencies associated with various vibration modes of my cantilever (attached pictures). The model only accounts for an anchor at the far end and material properties of each layer. In reality the bottom layer is piezoelectric, it is glued to the glass top layer. When AC voltage is applied to the piezo layer it tries to expand and contract length wise (long direction). This periodic driving force results longitudinal (long ways) and transverse (vertical) displacement of the cantilever. The long ways displacement results because of the exposed piezo part. The vertical displacement results because the piezo deform…