Classical Physics

Can someone help me with this question.... Explain how Boyle’s law is consistent with the equation of state of an ideal gas, PV = nRT. [its not homework (in my 20's) just trying to revive physics knowledge] Thanks for your help

Hey, Have a look at my experiment on standing waves in a sonicator bath : McCrunchy

Hi All. Does anybody know anything about using resistor wire as a heater element? I will do my best to explain what I am thinking and then hopefully my question will make sense If I had an area of tubular metal (such as a hand held whisk, just an example for size/shape) and I wanted to make it "heated" I would wrap resistor wire around it (approx. 1 mtr in total) and then connect an electrical supply to it. what kind of voltage/wire size would I need to achieve around 60 degrees c? would this knid of wire work - http://www.maplin.co.uk/module.aspx?moduleno=2196 if this question makes no sense then please say and I will try my best to explain another w…

I wonder what lasers are actually capapble of doing, i mean we`ve all seen the movies, where they cut holes inside thick metal doors with a laser and blow things up using a laser. How much of it is true?

So me and my friend are having an argument on how far it is possible for a bullet to travel on earth, with gravity. Under the conditions we just want to see how the farthest a bullet could travel under the best circumstances. We looked up some windspeeds and found that 372 Km/h was the fastest on earth ever recorded. We also found that the fastest bullets travel at around 2km/s. so taking into account this info. if a bullet was shot from a 45 degree angle, how far could it possibly travel? If anyone has an idea or can work this out it would be a great help

Not to get off the subject but I like to ask you an opinion. If a Moon sized rouge asteroid should enter our earths atmosfer an plunge into our mantal, give me a senario of events to happen with your ideas.

most say it is blue and talk about R scattering. i say otherwise. any wish to debate the color of the sky?

Can you give me a clear derivation of electron electric field intensity which is placed in origin and oscillating in simple harmonic motion, at a distance "r" in the positive x direction.

AKA, "Am I doing this right?!" Note: I promise I didn't actually multiple post this many times, I'm just making use of the divider as a logical separation between edits! So, some background: I'm currently doing some design work with pneumatic rifles, and I want to actually go about this the *right* way - that is to say, I want to actually put some engineering skills to work - and hence want to describe the system mathematically. The gas under consideration is compressed air, and the temperatures follow the normal range of ambient outside temperatures in North America during anything but winter - aka, roughly 0-30 degrees centigrade. SO, given the fact that …

Is it possible for an object to experience some type of Entropy by means of stressing their gravitational field? Let's say, for example, you dropped an object into a gravitational field. The object can not reached the center of the field for some reason though, except that it's not being actively stopped by something, like a mass. (Let's assume it's caught between to portals that lead to each other.) In this case, the object will fall infinitely. If force is continuously applied to the object by the gravitational field, shouldn't the gravitational field be expended somehow? Thanks!

Hi guy's my first post on this forum but would like to add something. I'm no scientist but my friends and I had an argument about space-time the other day. This may seem trivial to you but I argued that there is no such thing as backwards in space-time and they argue that there is. My argument simply put was that even moving backwards you are still moving forwards. Is there a way I can put it to them that is understandable? Thanks in advance

this thing has been driving me crazy for some time and i can't figure it out.. is a projectile with a bigger mass better for absorbing as much momentum from a potential energy source (mechanical spring or chemical blast) or a lighter one?

As light can be focused to a small area with the use of a lens, how could heat -say from a household radiator- be concentrated into a smaller area ? As to focusing invisible heat from a large source to raise temperature of a smaller body- Miguel

Let us consider a particle in air. When light falls on it in one direction , it oscillates perpendicular to the direction of the light wave since it is a transverse wave. When sound passes through a particle through rarefractions and compressions, the particle oscillates in parallel to the direction of the sound wave since it is a longitudinal wave. But if both these waves pass through the same particle in one direction at the same time , then the particle should vibrate parallely and also perpendicularly to the direction of the wave. But at a time the particle can move only in one way. So if the vibration of the particle is neither perpendicular nor parallel in whi…

A plain bar magnet --------------------------------------------------------------------------------- N................................................................................................S --------------------------------------------------------------------------------- above, will produce a given field at point x below : ................................................X If the ends of the magnet body are bifurcated by slits "===" : --------------------------------------------------------------------------------- N.................................................................................................S ===...........…

We got an interesting thread just now, from Mahela, asking what is the most modern definition of the meter. That prompts a question about where the definition of the kilogram is going. Any ideas? Any news about recent developments? Right now I believe the kilogram is defined based on a block of metal kept somewhere in France, sort of like a bank vault. Correct me if I'm wrong about that. Is that situation likely to continue for yet another 10 years?

came up with this idea recently after viewing a show about how air balloons can safely lift large, heavy objects from the bottom of the sea. I would like to know, from a physics/engineering perspective, is this idea plausible or a complete joke? Basically: The lifting method employs air-bags. A balloon is attached to the load, and air is pumped into it, generating lift equivalent to the water displaced. Crude drawing here: http://vidlord.com/UnderwaterTurbineIdea1.jpg See the following regarding air bag lifting large object from the sea: http://www.patentstorm.us/patents/5516235/description.html The tanks do not have to be hardened, expensi…

Hi everyone, Im learning about the basics of resonance, and I am just wondering why it is not observed more often in everyday objects. For example, if one produces a frequency that is just the right frequency of a wine glass, it shatters. So why dont common objects around us start visibly vibrating even though there are many different sound waves constantly produced around us? (For example, there could be music played loudly, someone shouting or banging a table loudly, and arn't there a lot of other waves circulating around us from wireless devices?) I'll take a shot: Most solid objects around us vibrate at a frequency that is relatively HIGH, and most so…

What are the scientific ramifications of Albert Einstein's statement that "particles of matter are, at bottom, condensations of electromagnetism?

i'm yet to research this idea.... having said that, if a air damb was made and inside of it was a mini wind mill and the power of which was directed to the alternator that in return charged the batteries that the vehicle runs on...... now i understand that enough energy probably would not be produced to run the vehicle on it's own, but i would like to think that enough would be created to make the batteries charge to stay higher, longer. questions i have...will research on my own....but if you have the answer please share... what is the ratio between the minimum air speed on the blades, the blades surface area and it's out put in torque? what is the ratio bet…

Hello. Can someone help me with how to calculate how much energy (in joules) it would take to lift an object with a given mass and radius out of the earths gravitational field? I get the answer in m\s (escape velocity), but I need to know what correspond to that in energy. And I also wonder how to calculate how much fuel is needed to make an object escape the earth. Thanks.

A white towel or a black towel, both equally soaked and under same test conditions in the shade ?

OK A dyson Sphere is out of the question as a space based solar power station because 1) We'd be blocking out the entirety of the suns rays to earth causing major devastation to a huge list of things on earth and 2) im sure we probably don't even have enough material on eath to entirely encase the sun completely. So I thought how about a dyson swarm instead. Questions begin: 1) What would be the most efficient way of launching the swarm? I am of the thinking that launching one or two of these would be the standard affair of using a rocket or space shuttle to carefully place them but there would be a much larger number of these to qualify as a swarm and I d…

I just don't understand what anode rays are, how they are made or where they come from.. Any help will be greatly appreciated. The Wikipedia article is a stub and many others simply state that anode rays "occur".

One litre of earth sea level atmospheric air, if taken to the moon surface and released into a non elastic polyethylene bag as large as needed, would occupy what volume ?