Classical Physics

Calculate how long would a day be if the Earth were rotating so fast that objects at the equator were apparently weightless? This is a question of posed and asked for a solution. Perhaps it is semantics or the way I am viewing weightless incorrectly, I have a problem with this question itself. Weight is commonly defined as the force on the object due to gravity. Now the solution to the problem is the earth would need to rotate approximately 17x faster to achieve weightlessness. Where the spin of the earth would be so fast it would cancel out the pull of gravitational forces. My question is this. Isn't this just buoyancy and not weightlessness? If I were to div…

know that objects with the same surface area but different densities fall at the same speed in a vacuum. However, there is actually a big argument between me and my girlfriend, at the point of I feel like strangling her to death. I say heavier objects do fall faster (I provided calculations). She (appears) to think that this is nonsense and am full-of-shit and she knows better because she knows more about the topic and am just a uni student (She was my lecturer, before we started dating. Now shes just my bitch) I dropped a piece of paper, and a piece of cardboard with similar SA. The cardboard fell much faster. I could explain this by stating that heavie…

Hello. Before I discuss. If anyone is not familiar with "cymatic". Sound waves cause shapes in vibrating boards altering by pitch. https://www.youtube.com/watch?v=GtiSCBXbHAg Now imagine a fuel injection system where less fuel was used in combination with sound frequencies most conducive to spreading the misty fuels. So instead of the sand/salt in video on a 2D surface, we are discussing fuel particles spreading by sound waves in a 3D plane. If this idea works it could be a billion dollar one, but I have other pursuits. How is it faulted? Has there been publishings on effects of sound on gasses? This idea seems to make sense to me. I am…

1. How could you measure your output power developed while pushing a car? 2. If you developed a certain amount of power running up lets say 2 flights of stairs, could you develop the same power if you ran up twice as many stairs? 3. What factors affect a persons output power running up stairs?

Question about Coulumb's Law, in relation to electrical engineering: http://en.wikipedia.org/wiki/Coulomb's_law Coulomb’s law gives an expression to evaluate the electric force in newtons (N) exerted on a one point charge by the other: Forces are experienced by Q1 and Q2, due to the presence of Q2 and Q1, respectively. They are equal in magnitude and opposite of each other in direction. Now, I ask: Where did the inverses of Q2 and Q1 " pop up"?? Are these the anti of Q2 and Q1? Have these ever been seen? What I am thinking is this: Supersymetry, Superposition and Quantum Gravity, Quan…

Hi all, F=ma If a=1, F=m How can force and mass be equated and become equal. They are different entities. It' s same like saying wood=iron

When I hold a ball in my hand... What is it made of? More of matter or more of forces? In other words what accounts for the mass of a body, the atoms, nucleons, electrons etc. or the forces that hold them together?

Resonance http://en.wikipedia.org/wiki/Resonance Issue with Resonance and Electron Excited States. From what I gather systems resonate at their natural frequency but when an " external force" out of balance and or in phase with the natural oscillation is applied " in this case a magnetic field" , the effects can either have negative implications and or positive implications , depending on the " purpose" for the applied force in general, of the experiment, the design and etc.. Having in mind an applied magnetic field, I would like to know if Resonance creates issues with electron excited states? I assume it but rather ask.. And if …

I push a ball hard. It starts to move. 1. Does it accelerate only for the time 'from my hand touching it' to 'my hand leaving it'? 2. After my hand leaves the ball, it attains uniform motion ( assuming no kind of friction). What sustains this uniform motion? 3. Why does the ball ever move? Why doesn't the energy that I supply to it just gets distributed as its internal energy?

I have seen some computer animations where collisions of motorbikes are simulated. These animations are really realistic; even the dynamics of the driver is visualized exactly. When a motorbike with a given velocity collides with an obstacle, the driver flies off the motorbike and falls to the ground. Why the motorbike driver flies a certain way and why he can spin around in the air? On which equations foundate computer animation engines that simulates such behavior? What is the most hazardous factor injuring a motorbike driver? It is the speed from the motorbike or the falling on the ground? From which factors the lethality of a motorbike accident depends?

If to cool temperature of the Venus like Earth's temperature then what will be pressure on solid surface of the Venus?Will it be like pressure on Earth's surface?

hi, i think about the cycle of wave, where is the center divide of wave like sinus and cosinus

What if it is more like the big ignition then a bang? All matter that is, was here all the time, atoms mingled with dark matter floating in infinite space. The ignition (introduction of energy) began to form the planets, solar systems, galaxies. Dark matter and dark energy causes the expansion. Gravity is relative to the curvature of space time. Dark matter is not influanced by gravity. Blac holes are the blenders in the universe recycling matter. ??????????????????

Please watch experiments with different types of liquids:

1. Will hover cars ever happen? 2. Where is anti matter stored and how does one know it is anti matter? 3. How do bladeless fans work? 4. How do i predict what i will see on tv? This is really strange, i think of an episode of a series randomly and then within the next few days i am watching it on tv. No force made. 5. Why do i wake up before something happens?E.g. a poster falling down. I don't know it is going to happen but there i am, suddenly awake lying there wondering why i am awake and then 5 seconds later, the poster falls down

What is the definition of a physical proof ??

It is the 2nd time on this forum that discussion goes about scaling and I'd like to make some point. Before using CAD programs, I must admit that I had a different view about scaling. My ancient view was simple: if you take a regular macroscopic object, say cup or a glass, and think that you must scale it 3 times, well things are simple: you get something like a vase. So I remember my first steps in Autocad and I was really surprised that it was not so simple. First of all, one has to consider that all CAD programs are ultimately mathematicals. Secondly, these programs are terribly dumb: if you don't tell EVERYTHING to the program, the command does not execute.…

Although this is something I should probably know as someone interested in theoretical physics, it's still a thing I never actually understood. So although a "n00b" question, I was wondering: Why is it that fire or extreme heat will melt / evaporate some materials while turning others to ash? I understand melting and evaporating, caused by heat reducing the bonds between atoms and making the material softer. This happens with most things... water, metal, stone, so on. But wood for instance will not melt into a liquid. It turns into ash... and I never heard of ash turning into a liquid or gas at any temperature. Why does this happen at an atomic scale? Also, what d…

I know why metal feels colder that another object of similar temperature. It is because are bodies don't feel temperature, we feel the amount of heat either leaving or entering our bodies. Metal feels colder (or hotter) than normal because it conducts heat very easily. On the flip side water has a very high specific heat and resists temperature change. According to what I am thinking, water should feel more average because less energy is being transferred. How does this make any sense?

I Googled this entire title but really no luck at all... I assume no he did not? But if this is the case, then how on earth was he able to conclude so much about what we know today as " science." Perhaps it was all geometrically understood in his time? And maybe its those geometrical gaps of Euclidean Space that make our understanding of QM and Physics Clash?? Sin: http://en.wikipedia.org/wiki/Trigonometric_functions Under: Series definitions Regarding : Tangent When this series for the secant function is expressed in a form in which the denominators are the corresponding factorials, the numerators, called the "secant numbers", have a…

I appologise for my poor English, it is not my first language, and also for posting this here, i wasn't sure where to do so. I'm 15 years old and I love physics so I learned calculus 1, calculus 2 and classical mechanics by myself and I am now learning electricity and magnetism. I do it as a hobbie, for fun, and I want to be a theoreticall physicist one day (being paid to have fun ). I want to learn relativity and quantum mechanics. So my question is, after i finish with Electricity and Magnetism what order of subjects should I follow untill I reach quantum mechanics? What other physics should I learn before this two topics? Thank you all and again, I'm sorry for p…

Could someone please help me with the problem set? Imagine that light did not have a constant speed, but behaved in the manner expected from experience. Namely, if the source of the light is rushing toward you, the light will approach you faster; if the source is rushing away from you, the light will approach you slower. This is incorrect, of course, but it's worth investigating the consequences of a non-constant speed of light because the failure to observe those consequences is evidence that the speed of light is constant. With that backdrop, consider a binary star system situated a very large distance L from Earth. Let the angular velocity of the smaller star be ω, as…

Normally, I don't ask questions on here because I figure Google is probably faster and there is no need to bother people with questions I can easily find the answer to myself. That said, I've had a weirdly difficult time in this case finding an answer to what seems like a relatively straightforward question, so maybe someone here can help me out. I'm trying to find two things, and I'm having the most difficulty with the second. I need to find the drag on a cylinder with a height of 1(unit), or a cylinder with an infinite height or a circle on a 2D plane for a fluid with a given viscosity and density. Any one of the three works. I also need to figure out the rate a…

As matter attracts other matter through electromagnetism and as that combined matter within a per unit volume becomes more dense, as it is compressed into a smaller per unit volume, a portion of the original per unit volume will be left matter-less, thus in theory creating a vacuum. So is gravity actually a suction created because of this vacuum?