Classical Physics

I am engineer and have a question about magnet while just playing with magnets. Let say I create permanent magnet by investing 1 Watt energy by electrical process then I can displace virtually infinite amount of iron by that magnet.(I am not repelling that object) and as per principle that another object also work as magnet and that object also can move infinite amount of irons and so on. Isn't it paradox?Or any explanation?

As I am walking through the store, I find a pop tube toy. I fidget with it a little bit, pulling it, and pushing it back together and do a few experiments because why not. I pull it in a way where the force must curve to reach the other side to confirm that a forces prefer to, in fact, travel in straight lines, simple enough. However, one thing that did peak my curiosity was that the popping ‘chambers’ popped from the edge and creeped towards the middle. My initial hypothesis was the two pulling forces would meet in the middle to where they would cause the chambers to have most stress, and pop from the middle out. After this observation, I have a few new i…

This question isn't specific to classical physics only or even to this particular subject. Actually the question is how can I learn more than what school is going to teach me. Since the schools teach really slowly and I even prefer to learn by my self for 2 reasons that, I can study "anytime" and for as long as I want to. No doubt schools are good, but it's the fact that they can't match the feel of self learning. So when I complete all the topics mentioned in NCERT books(They are the basic and compulsory books for high school), then what? How will I know what I have to learn next? Please guide me Thanks

There is science fair competition, and I have decided to participate in it with my friend by making an "Semi-Ion drone". It is semi-ion because i am thinking of using an compressor to compress the air and then ionise(am i spelling this correct?) it, which i believe should provide more acceleration since more air particles are being ionised? Am I correct with my thoery? Also, I guess since there is a need of 20 kV, does it mean it's energy requirement is huge?

I heard about fly wheel battery systems and after reading a bunch of articles and watching some videos about it I have an Idea. Basically the fly wheel looses it's rotational energy only due to friction(or am i wrong?), so if I we are able to eliminate all the friction forces by taking it to space where it won't take much energy to elevate it with magnets and also by creating vacuum, will I be able to create unlimited energy since the wheel will keep spinning for ever(or at least for drastically longer period than the current ones)?

I used to have an excellent online calculator that enabled me to show the possible orbits of a satellite around a larger secondary body (e.g. a moon) which itself was in orbit around (say) a planet. Unfortunately my local PC repair shop unwittingly deleted the calculator during a refurb. And since I can't recall the scientific/technical term for this "three-body" gravitational arrangement, I'm no longer able to locate online the calculator in question. I would therefore be very grateful if anyone can help me here. PS. Unhappily I don't have anything like the mathematical skillset to do these calculations by hand. Thanks in advance.

Curiosity question. We keep a small fridge and the temp is kept quite cold. When I take a bottle of sparkling water out, it is clearly in liquid form. When I open it, within 5-20 seconds the better part of the bottle has turned into a frozen slush. I'm aware that pressure can affect freezing temperature, but opening the bottle should lower the pressure which should actually raise the freezing temperature. What is happening here? I'm stumped.

Is there an error in the calculation of the energy stored in the capacitors? The fact is that the charge doesn't tend to zero but to the electron charge...

CollinJ simple unification theory has an analogy to my problem with spacetime events and possibly has similar resolutions, but I did not want to associate myself with collinj as that would be a handicap for CollinJ. However we both have the same thought in terms of seeing something that goes against established theoretical math, and this morning I think I noticed the reason. In relativity a spacetime event is defined or represented as a point in a manifold and transforms are made between two observers of the point in two different inertial frames. The problem I have with this is an event is neither a point in space because it has a size, nor an instant in time…

Well I have been doing some digging on how fast magnetic waves travel through metals based upon various wavelengths and it is, well, complicated to say the least. Let me start here with "The speed of electricity" from wikipedia. https://en.wikipedia.org/wiki/Speed_of_electricity Now I am not interested in how quickly the electric field travels along the current. They already provide the formulas for that. What I am interested in is in the next paragraph. Now, I am interested in knowing how quickly it travels through something OTHER than empty space, like a conductive metal. I want to know how fast that would travel so I did some digging. https://phy…

Is possible to make any of the 4 fundamental forces weaker or go to 0 in any situation?

Somebody on this site (I won't name drop) said that he was surprised that the magnitudes of my spectrum were not negative. Do you "scienceforum" people not understand the formula for magnitude = sqrt(amp.re^2+amp.im^2)? Exactly how do you get a negative value out of that?

Since the shared electron in the covalent bond oscillates from one atom to another, its should change the magnetic fields around it and hence result in formation of electricity. But why it doesn't happen?

I suppose the answer is yes, but if so then why don't more people do it ? Not everybody washes their clothes every day, so this could be a really good option to make them last longer. I know that it was popular one time to microwave underwear, so it's not like there isn't a market for it. Take towels for example. Most folk don't live inside a hotel, so they don't have new towels every day, and once the towels are exposed to the heat and moisture in the air bacteria begins to grow, perhaps that would be a good example of using UV light. So is it worth getting a couple of lamps to maybe blast clothes after a wash, just to be sure, or for accent clothing like …

Hello I was wondering if I put a box on the ground and then walk 100 yards away, the distance between the box and me is 100 yards. At 100 yards if I clime a tree will the distance between me and the box decrease as elevation increases? If yes then by how much will it decrease if I am elevated 50 yards from the ground? Thank you

In daily life, the sound of mixing flour is almost undetectable; the sound of hitting the sandbag is dull; The maracas used as a musical instrument has a bright and loud sound; the sound is clear and melodious. The sound produced by the earth's particles under the disturbance of external forces is affected by many factors and produces different sound characteristics. So I wander which and how different factors actually affect the sound made by the collision of tiny solid particles such as sand. And I'm eager to learn the mathematical expressions between the sound and different physical factors. P.S. The sound here is not restricted to a single factor; and th…

I have a introductory Calculus book called 'Thomas' Calculus 14th edition'. I want to learn classical/undergrad physics through the book "University Physics with Modern Physics 15th edition". Based on the contents of Thomas' Calculus, how much of it do I need to know to understand the Physics textbook I have? 1. Functions 2. Limits and Continuity 3. Derivatives 4. Applications of Derivatives 5. Integrals 6. Applications of Definite Integrals 7. Transcendental Functions 8. Techniques of Integration 9. First-Order Differential Equations 10. Infinite Sequences and Series 11. Parametric Equations and Polar Coordinates 12. Vectors and the Geometry of Space…

What is the equation to find the bouncing height of a cylindrical tube when the flat surface is falling on the floor under earth's gravity? I know the mass, drop height and material properties of the cylindrical tube.

I've not really studied noble gases before, but on general principles, I understand that for 2 particles with mass ratio r, and initial scalar speeds u1,u2, the following equations should hold: u1 + ru2 = v1 + rv2 (conservation of momentum) u1^2 + ru2^2 = v1^2 + rv2^2 (conservation of energy) Leaving aside the trivial no collision solution (v1 = u1, v2 = u2), the quadratic formula gives the change in momenta during collision as: v1 - u1 = 2r (u2 - u1) / (r+1) ; v2 - u2 = 2r (u1 - u2) / (r + 1) ... which yields some rather puzzling consequences: 1) For a pure noble gas isotope (r = 1), v1 = u2, v2 = u1 - particle momenta a…

Gravity Is simple, no need for fancy equations F=mg Is pretty much enough Matter pulls matter A most basic law in our universe In particle dimension electromagnetic forces are at hand of course. The force of gravity is yet too weak at this level. From a certain mass gravity kicks in. Is this certain mass known to you ?

Would it be fair to say that there is a similar approach in thinking between Laminar flow and how a laser behaves i.e. all things “pulling together”. I understand Laminar flow to be fluid particles following in smooth adjacent layers with little or no mixing. Whilst optical light waves pass in a coherent frequency and waveform to focus light on to a tight spot, essentially “all pulling together”. How can the two definitions be brought together ? I tried looking this up from the water side of things, and came across diffusion when paired with fluid flow, is this how flow is measured i.e. calculated by how much resistance it is met with, I don’t think light i…

I have seen and been told that the voltage increases in a solenoid with more number of turns. Why does the voltage increase, and what is the point of doing this because the current should remain the same since resistance is increasing at the same time and that would balance the equation V = I*R. Right?

Hello everyone, this is my first post on the website so if I make any mistakes please be patient and guide me through. I'm in 10th grade and I read about electricity in my science class. In that we were told, flow of electrons produces electric current, after a few days I thought about it and developed some doubts: 1- What happens on movement of electron that electric current is produced? What is the magic magic behind the scene? 2- and if there is no logical reason, if it just happens and I take this as just a fact, like if A happens then B happens. If electrons flow, then electric current flows; won't this violet the law of conservation of energy. …

I saw a video on YouTube where a person holds a bulb between 2 medium sized magnets, the bulb starts glowing. Neither the bulb is moving nor the magnets, then how the current is generated?

https://www.youtube.com/watch?v=uvf0lD5xzH0 this video shows how the air pump works https://www.youtube.com/watch?v=zFdyqTGx32A&t=109s this video shows how a ram pump works https://www.youtube.com/watch?v=pORYUjKoSuA this video is cool https://www.youtube.com/watch?v=6koHqPM_zxg&t=1s more indepth ram pump description my idea is to combine the first 2 videos to increase power