Classical Physics

Hi there, So, yes, I did spend some time trying to answer this using google, wiki, and the search feature on this forum, but couldn't find anything that exactly addresses my question. My memory of college chemistry is quite hazy, but if I remember correctly, certain atoms combine in predictable ways to make the same kind of molecule every time. For example, if elemental Hydrogen and elemental Oxygen meet they will make H20 every single time. (If this is wrong, please correct me!). If the above is correct, why doesn't the same logic apply to subatomic particles? If one electron and one proton can combine into a stable, electrically neutral atomic molecule ca…

Why specifically can't matter be created or destroyed? Is it because everything in the universe only changes the amount or position of matter and energy?

Hi all, I've just been reading some posts on here about perpetual motion and magnetism (I know...). and the thought occured to me: why can magnets not be considered an outside source of power? like a water wheel uses water to turn the wheel, why can magnetism not be used the same way? (a constant downward force on one side of the wheel) if the magnet provides the power (seperate from the system) surely this doesn't break the rule? or does it? if it does, why? It may look like a stupid question, but its hurting my brain... Thanks, Alan

I had a couple of lessons about pressure at my high school last week and my teacher taught us some principles but not why they are true. Why is this statement true: Pascal's principle : Pressure applied to an enclosed fluid is transmitted undiminished to every part of the fluid, as well as to the walls of the container. Why is pressure transmitted? Why not force? Why is this statement true: Archimedes principle : An object that is partly or completely submerged in a fluid will experience a buoyant force equal to the weight of the fluid the object displaces. Why is the buoyant force equal to the weight of the fluid the object displaces? And why is there …

What happens when two identical bar magnets are welded in a head-on position with their like poles?? Something like S-N---N-S Does the combination act as a single magnet or something like have a double strength north and two south poles at the other end? Please ignore the loss in magnetic properties due to heating.

What is the effect on a moving charge particle as the magnetic field become more intensified. The reason I am asking that I read in a book that the magnetic field only have effect only on changing the direction of a moving charged particle and doesn't affect its speed.

When we consider a beaker of water and two molecules, one completely inside the water and the other at the free surface, the water molecule at the free surface will experience net downward force of attraction and this causes the water molecule to behave like a stretched membrane, which is called as surface tension. Now to bring this molecule at the free surface to interior of beaker, one has to do work against the force of attraction and this is stored as potential energy. Water molecule acquires minimum surface area to have minimum potential energy. What is the relation between surface area and potential energy? More work done so more potential energy and more surface…

Greetings all I have a few questions on the subject please. from wiki "In quantum field theory, the Casimir effect and the Casimir–Polder force are physical forces arising from a quantized field. The typical example is of two uncharged metallic plates in a vacuum, like capacitors placed a few micrometers apart, without any external electromagnetic field. In a classical description, the lack of an external field also means that there is no field between the plates, and no force would be measured between them. My question is does this effect demonstrate a force that may be consider as energy from the quantized field or vacuum energy that is not observed based…

Revered Members, Can i know what is meant by fermi level? I googled this, but i could not understand. One site says Fermi level as top of collection of electron energy levels at absolute zero. As far as my knowledge I know electron energy levels as K, L,M, N etc with energy values -13.6eV, -3.4eV etc. Top of collection means, is it O eV?

Revered members, What is the difference between line spectrum and band spectrum? I have seen the line spectrum exhibited by Mercury vapour lamp and Hydrogen vapour lamp. My teacher says that band spectrum is similar to line spectrum and said that band spectrum is nothing but a line spectrum with large width. Is that true?

HOW CAN I BETTER UNDERSTAND STATICS, WHAT VERY BASIC MATERIAL CAN I USE TO UNDERSTAND THIS STATIC OF A THING? THANKS IN ADVANCE FOR THE SUPPORT.

Ok so I'm writing a science fiction story in which law enforcement uses non-leathal weapons based on laser induced plasma channel technology (found it on google). So a gun shoots a laser, turns the air between the gun and the target into plasma, and then sends a bolt of electricity through the channel. In my book a criminal is wearing thick rubber boots so this brings up a few questions (and I'm sorry if any are innately retarded but...): A) Would those boots protect him from all non-lethal levels of shock? If not what would be an idea for futuristic, makeshift, super-insolation that a criminal might employ. B) If the guy is fired at, there would be no current of…

Ok, so I'm not sure if this is the correct place to ask this, but I'll ask anyway. I have been asked to find out the angle at which a water droplet will start rolling on an injection moulded surface of PP (Polypropylene) plastic. the only force acting on the droplet is gravity and it's own surface tension there is no air flow over the drop What i know so far... - PP (Polypropylene) plastic is somewhat a hydrophillic surface which means the contact angle of a droplet is less than 90 deg This sugests that if the plastic was tilted to an angle of 90 degress the water droplet would still not run off. What is confusing me is the addition of the…

From past few days I've been studying Electromagnetic Field Theory by Sadiku. As electromagnetic field theory requires knowledge of vector calculus so while studying I came to struck up with a problem which is related to parametric equation, which is also related to motion in one dimension to two and three dimensions. So let me explain my doubt Take a look at figure: Below is the graph for position vs time here in above graph what we really show is that how a position of an object or particle varies with respect to time. In other words position is a function of time. so if "x" is used for position and "t" for time then x(t) = f(t); some function Now …

Hello, I want to know more about buoyancy. How ship floats? We know that ship is much denser than water. Somebody had told me that it floats because it is open and therefore there are air on it and air is less denser than water. However, I don't know the formula on how to get the overall density if the air already involves. Would somebody give me the formula on how to get the overall density wherein air involves, like the overall density of ship? One more, So what does the above quoted statement means? Meaning the submerged object is in the center of the fluid? Any help will be greatly appreciated. Thank you.

Why is the vector form of the law of gravitation : F = -GMm/r^2 Why is there a negative sign ? Aren't the force direction and the displacement directiona the same ? And also in derivating the law of gravitaional potential energy The work done by the external force to move the body from point r1 to infinity equals ecatly the potential energy the force of the extenal force is the same direction as the displacement so Work is the INTEGRATION of ( the magnitude of F * the magnitude of the displacement * cos 0 ) and this turns that work from r1 to infinity = -GMm/infinity - (-GMm/r1) = GMm/r1 (No negative sign) What is the Error in these …

I was thinking about how all energy normally degrades into heat, such as in the resistance of electric current, friction in kinetic energy or how light is absorbed into a surface and warms it. Does this happen with sound? Of course i googled it and found this answer page: Here Some people have stated that sound energy keeps spreading out uniformly to infinity, some people think that it will degrade to a form of low level heat energy.. none state any references.. But.. If a 2000w speaker was placed within a bottle in a vacuum so no sound energy can escape, will the sound eventually heat the surrounding area by some method? or would this sound continual…

Lets say there is an object on a ramp of 45 degrees. There is no friction between the object and the ramp. Will the object have the same acceleration as an object in free falling?(g)

Hi. How can the exterior (as in a yard) ambient light just after sunset be focused/directed to a photosensor in order to delay its action that turns on some lights at night ? The sensing device is not adjustable for threshold of operation. I have several plano-convex and bi-convex lenses; from 1" to 6" diameter. With a defined light source as the sun disc, focusing it to the photosensor is no problem -when coaxial- but with diffuse light it is another story. Suggestions, please ?

if the light from a distant star encounters a enough gravity it will bend in an arc around it... Right Ho do we know that the light source is not right behind us or beside us somewhere at a much shorter distance

So what is the energy measured in? And also how was the question worked out?

How can be time defined in the simplest way? According to my theory, time can be defined as 'change' in any form, any place in the universe. Any type of change in the real universe is called time. It can be changing of state, shape, size, color, temperature, force applied or the place etc. So we can say that if there no change in the universe, there is no time in the universe. Because time is the 4th dimension, so if time is not there, the whole universe becomes 3 dimensional. Then the universe will stay like a paused video if there is no time. Can you prove it is not?

Revered Members, In my attachment, while measuring the angle between current element I(QR) and magnetic field B, they are going in clock wise direction that is from R to Q(shown in Red line), so it is (90 - Θ ) and while measuring the angle between current element I(SP) and B, they are going in anti clockwise direction that is from P to S(shown in Red line), so it is (90 + Θ). May I get clarification from revered members as to why they have gone in different directions to measure the angle, instead of adopting the same direction, either clockwise or anti clockwise, for measuring the angle in the arms QR and SP? My friend told, the reason is,Because they measure the an…

I'm having a discussion with several folks about the results of a head on collision of two similar vehicles that have about the same weight and crush properties. I stated that if both vehicles collide head on, at 60 MPH, the impact force and damage to each vehicle would be roughly the same as hitting a solid unmoveable object at 60 MPH, because each vehicle absorbs roughly 50% of the damage. They claim that because both vehicles are traveling at 60 MPH, their combined speed of 120 MPH would increase the damage to twice what it would be if the vehicle hit a solid object at 60 MPH. How can I explain this to them?

Hi, I was wondering, let us assume we have a swimming pool of 10x10 meters and infinite height. on the bottom of that pool we have a small hole. lets say the diameter of the hole is 1 cm. now, we start filling the swimming pool with water. let us assume as well that: the amount of water being filled to the pool >> the amount of water flowing out of the small hole. ofcourse as time goes by the amount of water flowing out of the hole increases. (since the pressure increases as the pool is being filled with water.) let us define the amount of water flowing of the small hole by x (liters per second) my question is this: does lim(x) = infinity ? …