Physics

I know its probably accepted that a star based on chlorine is impossible, but for the sake of argument if it were possible how would it be and what would it look like or behave like if real?

Hi can anybody help me with my egg launcher project? I can't really decide what to build. We're suppose to build a egg launcher taht willl launch 20 meters, and it won't break the egg. In my mind i had the trebuchet in mind or something like that but I have no idea how to build a working model. Any other egg launching device you can suggest? Thanks a bunch

i just started studying physics in Conceptual Physics, which is proving to be a good first book. I don't understand something though. It says power=voltage X current. But Current = Volts/Ohms - does that mean power = volts squared / ohms? i'm a little confused...thanks in advance for your help = )

In the electromagnetic spectrum we see light to be aproximately in the middle. Light is accpeted to be electromagnetic radiation made up of photons. The only difference that i see between the different types of waves(x-rays, gamma rays, radio waves, microwaves) is the frequency. If all these waves are electromagnetic including light and have all the same speed(speed of light) with the only difference being the frequency of the waves, do you think that it would be safe to say that these other waves are also made up of photons? Or perhaps only at the frequency of light does the wave obtain particle-like characteristics and if you were to accelerate or decelerate the fr…

i was perusing the Bulletin on the undergraduate program in physics at my university, Queens College. It seems that although mathematically intense, the labs required are light compared to say, chemistry, at least in terms of the number of lab classes needed for a degree. is this true for physics in general at the undergrad level, or is it just dependant on the particular college in question? thanks

Now, correct me if Im wrong. but I believe salt water freezes at a lower temperature than regular water (fresh water). If this is true, I was wondering why.

I have been pondering this for a while now. Since anything moving has energy and therefore has a temperature - and when there is more motion that means more energy and higher temperature. I have often wondered if you took two rooms, identical in size, and set them at the exact same temperature, but in one you played loud music and the other you kept silent. Would the temperature be raised in the room with music? Since the sound waves would vibrate things in the room, there would be more motion. They would also cause the air molecules to vibrate.

G'day there peoples, I'm new, so bear with me... I'm a journalist, and I'm writing a piece on the following story... http://www.physorg.com/news119553781.html I need to know just what it is that is causing the hydrothermal explosion. I headed to this site; http://www.hanksville.org/daniel/geology/explosion.html And I got the following, but I'm not certain; A hydrothermal explosion is caused by the combination of superheated water turned to steam meeting with cooler water (or is it) with ... Please explain, and soon... lol! Josh

I was going through some questions on my latest course this morning, and when answering a question on angular velocity, I was wondering how angular velocity applies to light. If light follows a curve, how do you account for the constant speed without any acceleration? Is this just a case of mixing classical mechanics with relativity, and the equation for angular velocity just isn't applicable...can somebody explain how this is accounted for ?

Anyone want to try? the ones on the link are my ones. No glue involved.

A current can be induced by spinning a wire in a magnetic field, this is due to a change of area in the magnetic field yielding a magnetic flux which in turn induces a current into the wire or solenoid. So if a wire loop, or series of fifty or so were being spun by an electric motor powered by a car battery, this would in turn use an outside potential to power the car to counter the nonconservative forces. Thus the vehicle would not need fuel, but rather an initial push of the battery to start the recharging process. Is this plan plausible?

Why is enthalpy conserved in steady flow processes?

I'm supposed to show how to rewrite Dieterici's equation of state: P(V − b) = RTe^−a/RTV in reduced units: p(2v − 1) = t*exp(2*(1 − 1/tv)), where p=P/Pc, v=V/Vc and t=T/Tc and (Pc, Tc, Vc) is the critical point. I should further show that the equation of the inversion curve is p = (8 - t)exp((5/2) - (4/t)). I'd be greateful if someone could show me especially the first part. I'm not sure how to approach this. Thanks.

could you tell me why they use halogen instead of vacuum to make small lamp with high power, and why we can touch the surface of the halogen lamp ? Thanks !!!

Anyone hear about it, please tell me if you know how it works ? http://www.ied.edu.hk/has/phys/phydemo/sd_wa/utrav.htm What happen to the bottle in this link above ? Thanks so much !

Im no physicist, so correct me if I'm wrong, but from what I can tell from what I'm reading on Wikipedia, CO2 gas takes up about 808x as much space as solid CO2. Now atmospheric pressure is 14.7 PSI. So if you just filled an unsealed tank with CO2 gas it would be 14.7 PSI in there. So, if you filled that tank instead with dry ice, then you'd be storing the equivalent of 808x as much gas, which would be the equivalent of nearly 12,000 PSI. And because dry ice takes time to sublime from solid into gas, then you would maybe not even need a tank with a very high pressure to hold it since you could just let the excess bleed off, and your tank of fuel would still la…

Something that has been on my mind for a while, ok. As far as I know, energy is matter. A photon ‘weighs’ something. A Neutrino (They said in the old days – 20 years ago etc, weighed nothing), aka, Neutral. Now we know the Neutrino does ‘weigh’ something. So if it has mass it has energy, right? If all energy weighs 'has mass’, something. Where does the energy of lightning strikes goto? It goes to ‘ground’, as all our artificially generated electromagnetically energy goes to ground, (AC – Neutral ‘Return’/Earth) – (DC – Negative Ground/Earth). Besides, sending satellites into outer space, what does the planet earth lose in weight, or does it gain, du…

Neat summary that was just emailed to me. Drop a marble onto a bed of fine sand and you get a fluid-like response, but there's no cohesion or surface tension as in a fluid. Also, you get jets of sand from the interactions in the impact void whose behavior depends on the ambient pressure. http://jfi.uchicago.edu/~jaeger/group/granular2/jets.html

My physics absolutely stinks, mostly when it comes to the absolute basics. So anyways, there was this guy who survived a 47 story fall, onto the PAVEMENT. Splat. When someone/something is falling, do they keep accelerating as they fall further and further, or do they reach a maximum speed? Does someone who falls 90 stories have similar chances of surviving to someone who falls 47 stories? I've read about people surviving falls out of airplanes, so something tells me that I am right, but I am not sure. They had to pump almost twice his normal blood volume back into him. What a mess. http://news.yahoo.com/s/ap/20080104/ap_on_he_me/skyscraper_fall_survivor

http://sohowww.nascom.nasa.gov/descriptions/mission/soho_solar_maximum_proposal.pdf This is a concise, though reasonably in depth amalgamation of what the satelite has shown us. In an earlier post I mentioned about a second "solid" layer beneath the photosphere. This was first based around a NASA channel broadcast in 2006 that showed how, when using a vignette, the inner layer can be seen with the bombardment sensors. I also found a blurb on the SOHO site later that year that described the same, but it's eluding me, as irony would have it. The broadcast was fascinating. No what I layed claim to has nothing to do with iron content, but with comparisons to the gas gia…

Hey I am making a boomilever for a science project. Does anyone know how to either a.) construct it- there is like no site that tells you how to do it b.) construct joints so that it makes the boomilever stronger Answers to both questions would be great. Links to sites would be great or just general info. Thanks again

If a boat is moving with constant speed through the water are there any drag forces acting on it?

okayy well i think i have an answer..but i dont know scientific reasoning.. heres the problem: Consider drops of water that leak from a dripping faucet. As the drops fall they a)get closer b)remain at a relatively fixed distance from the other c)get further apart i said "c"..but now i need scientific reasoning.. how do you put scientific reasoning to that??

Hi guys, I came across an interesting problem recently while building a water feature out of an old kettle and a terracotta tub. I mounted the kettle at a 45 degree angle on a piece of pipe and had this feeding into the tub as per my rough drawing at: http://erickendall.gallery.netspace.net.au/water-feature The return pipe to the resevior gave me the water level in the tub, but to make the whole unit look better and to stop leaves and debris going down the return, I made up a brass cap so the water would have to be drawn from below the water surface to get to the return. I thought this would work quite well, but after about 2 minutes of running the unit, it made a gurgl…

Take a look at this image, produced by me in Photoshop: I began with the two lower circles. The are red (left) and yellow (right) at 50% opacity. At their intersection, they produce orange. Then I took another circle and placed it overtop (purple) again at 50% opacity to produced red (well, kinda pink - considering the opacity) at the intersection of it and the previous intersection. Now my question is this: how does one explain the re-emergence of red (or pink?) when red was used to begin with. That is, if we go with the theory that red is one of the primary colors (so it is fundamental), then it shouldn't be possible to re-create it as a composite of other …