Classical Physics

Always leave a system with moving parts. If the objects try to go in a straight line then there would have to be a force making them stay in the system, but forces require more motion, which would then require more force to not go in a straight line. (note: I'm only 14, so I don't know that much, but I'm pretty sure electromagnetism, gravity, etc. haven't been studied enough to assume them to be axioms).

Suppose a cannon fires horizontaly a perfectly elastic ball against a perfectly elastic wall, distant x, with speed v and at the same time starts rushing against the wall with speed u. Will the time taken for the ball to hit the wall and come back to the cannon be given by the following formula: [math] t=\frac{2x}{v+u}[/math]??

I am new to this site and have 1 question but can't seam to find out how to get the anwser...my uestion is can earths gravity be reversed.....keep in mind..I'm not a genus or anything...just something I keep wondering about...any help ould be appriecated

Okay, so I have been thinking about this for awhile. Gravity pulls everything down with the same air resistence at the same speed no matter the weight, correct? And gravity is what makes a ball roll down a slope. Then why when you get two balls with the same amount of friction, but different wieght, and you roll them down a hill, the one with more weight rolls down faster?

How does a liquid/medicine dropper suck in liquid? To some extent, I guess I know the answer but am not sure. When the bulb of the liquid dropper is squeezed, it forces out all the air from the dropper which creates a low air pressure inside the dropper. When the liquid dropper is immersed in the liquid & the bulb of the dropper is released, outside air pressure forces the liquid inside the liquid dropper but why does the outside air pressure force the liquid to go inside the dropper? Thanks, Ron

On History channels show The Universe they talked about solar storms "breaking" the magnetic field lines. This has confused me ever since. I thought magnetic field lines were mathematical representations, not a actual physical thing. How can a solar storm break the magnetic field?

Apologies if this is not in the right category. I can't find advice to this anywhere. I am installing solar panels on my roof. I want to know beforehand if it will interfere with incoming satellite signals, or with outgoing antennae signals (we rent out space to a radio station broadcast antennae). Even if you don't know the answer, some generalities would help. I have been told that since solar panels do not transmit a signal, it is completely irrelevant- true or not true?

Hi! Today I was taking care of my plants, and accidentaly my hoe beated in a stone and I saw a spark. Does anybody know what happens with the atoms? The first thing I thought was the work done by the shock energizes the atoms, and when the atoms get de-energized, resulting in the spark. However I thing that this is not a good interpretation of that.

I understand that as a result of the 3rd Law of Thermodynamics the heat capacity of a substance approaches zero as the absolute temperature approaches zero. What happens to the heat capacity as temperature approaches infinity?

Cold Fusion and Branly effect In 1989, Pons and Fleischmann claimed to cause fusion in an ordinary electrolytic cell containing heavy water. This process is named Cold Fusion. It begins by the electrolysis of heavy water on a Palladium cathode that induces the penetration of Deuterium in the electrode. This penetration is sometimes associated with the release of an excess heat and the production of Helium and more rarely Tritium. Many scientists who tried to reproduce this phenomenon were disappointed by the absence of result. But some teams around the world persevered in the study of Cold Fusion. The team of Mosier-Boss (see P.A. Mosier-Boss, S. Szpak, F.E. …

what happens to the atomic structure of the metal or any element when it is rapidly heated...... and why the resistance of any conductor increases with increase in temperature.....

This article is an abridged version of the original article posted in google groups. For further proofs or clarifications please download the file titled electrodynamics and magnetism.pdf from the link that is given at the last part of this article. As a preface – this experiment is based on these well established facts that 1) Current is the rate of flow of charge – any charge, not just the flow of electrons. 2) This flow of charge produces a magnetic field around itself/conductor. 3) Classical physics is purely deterministic and that definite causes should have definite results. 4) Observers in the same frame of reference (and who are at the same point and sta…

According to The Teaching Company's [Great Courses] Impossible: Physics beyond the Edge (lecture 22), Electro-Magnetic Fields "enforce" Electric Charge conservation; and, Gravitational Forces "enforce" Mass-Energy conservation. Does this mean, that Color Charge conservation is "enforced" by the Strong Force ???

I was recently watching a lovely program about energy production on discovery, when a intriguing question invaded my mind. Our major type of power plants all operate upon burning a fuel and transferring that thermal energy into a fluid medium such as water that in turn uses some of that thermal energy and converts it into kinetic energy and thus can spin a turbine's blades. But after this cyclical process there is another process happening as well, that is the cooling side. The amount of thermal energy that can be transformed into kinetic energy is dependent on the difference between the temperature of the fluid, so in order to maximize the amount of kinetic energy it…

When I was a kid, a mechanical engineer explained me a contraption he built. Said it self destroyed in test. From what I remember, will be difficult to explain with no sketch, but, trying : A horizontal cross, equal lenght arms, being the arms outer ends the shafts of say 4 equal bicycle wheels there. The cross assembly made to turn very fast on top of a vertical shaft motor, and the top tangent side of the bicycle tires contact a disc plate above, making the wheels spin. It had something to do with gyroscopic forces... Seemed he was happy with the brutal forces it developed causing its destruction. What could be he was trying to do ?

Found this question online: A ball with a mass of 250 g has a centripetal acceleration of 5 m/s2. What is the centripetal force acting on this ball? My calculation is 0.25 * 5 = 1.25N, but the answer is 1250N. I think the answer is wrong (because I believe all calculations should be done in SI units), but I just want to verify. I'd appreciate if you guys use simpler terms, because I'm in secondary 4 (high school equivalent) and this stuff is beyond my level (it's for Physics Olympiad). Thanks!

Bob has showed a kitchen experiment, I will do the same. This is small old video (sorry for the poor quality) of my casserole with cold water an reluctance of boiled salad (Greek speciality "horta"). Here we are: a small galaxy formation in my casserole. Stupid, isn't it? Only that here we have deceleration, instead of the observed universe which accelerates. Bad analogy or something goes wrong?

In another thread, we seem to have adhered to approved solutions while focusing on a natural process producing seperation of charged particles being taken from atomic structure and brought into concentric arrays and staying that way. A planet with negative electrical bias would then plausibly develop a positive charge at its core that is balanced against an equivalent negative outer shell. Does such an interpretation occur to other laymen or scientists?

Is it real or an idea? If it isn't real does that mean kinetic energy isn't real either? If kinetic energy is real does potential energy have to be real as well?

"An orbit is the gravitationally curved path of one object around a point or another body, for example the gravitational orbit of a planet around a star" (from Wiki). Under attraction, the naive point of vue is that bodies will bump. Newton made a hard job on demonstrating that bodies falling to each other will not necesseraly bump, but orbit. Under gravity, which is attractive. Well, I was wondering, based on the general symmetry of physical laws, if under repulsive action, maybe the naive picture of bodies expelling each other away was right, or do they orbit ? I couldn't find anything non-symmetric in the laws of motion. So I deduced that under repulsive …

swansont gf) Centrifugal force is an example where the force does not lay in the inertial frame; and where the force is perpendicular to the motion. But all manner of work can be performed by the force. swansont it would help if you were a little more specific - gf /

I read that each line on a line spectra for an element represents an energy level. Hydrogen only has 1 electron which is in the first energy level so why are there so many lines on the H line spectrum?

I'm having a bit of trouble understanding basic atomic structure. Do the electrons of 2 different elements have different energy levels? For example beryllium and boron. Are the 1S electrons of Be in its ground state occupying the exact same energy level of the 1S electrons of B in its ground state? Also I assume s and p orbital electrons are at different energy levels but what about the different p orbitals? Do they have 3 different energy levels or are all 6 atoms in the p orbital in the same energy level?

a 80 kg mass traveling at a velocity of 18 m/s collides with a 80kg mass traveling at a velocity of 18 m/s KE=.5 (m1v)^2=12960 j KE=.5(m2v)^2= 12960 j non elastic collision and boom energy destroyed. the two masses merge but they dont have velocity so no kinetic energy.

i have fabricated a multi-staged dielectrophoretic device (micron scale) to separate cells. i know its a pretty old concept, but i am actually a biological science student so i am obviously not very good with the electromechanics. when i tried to test this device the micro flow path is getting over heated, this causes the evaporation of the fluid (mobile phase) and the cells that needs to be separated. can anyone explain me what exactly is causing the heating and what parameters i do i need to modify in order to reduce the heat production and still achieve good dielectrophoretic separation.