Physics

Is it possible to have a mercury plasma cooled down to the point it becomes a superconductor?

While I was lying on my bed thinking in various things about engineering I thought this situation: Imagine there's a water tank (not full [almost in the half of the tank]). If we heat the water inside the tank, the water will turn into steam and perform a pressure at the tank walls and it can explode due the high pressure (there's no escape to the water). But what happens with the steam when the tank walls are lined with hydrophobic material, the tank will even explode due the pressure?

Hello! I have noticed (while singing in the bathroom) that some musical tones sound louder than others. Example: (if we play a musical tone-note C (261,63 Hz) and then with the same intensity A (440Hz), the sound that comes out does not have the same intensity.) I was searching for an answer, but unfortunately I didn't find it yet and that is why I am asking you if anyone knows what is the reason for it and whether it is related to aliquot tones and resonance? I apologize if the question is too easy, but I'm not in that field of study (I'm studying jazz- singing and composing ) Thank you and have a good day! Anja

I have problem understanding Newton-metre unit (or should it be written in all-lowercase style: newton-metre? Or newton-meter perhaps?). I don't have the problem with the unit itself, but with the way the unit is written: N m (or even with a small central dot in between: N*m). According to Wikipedia, the newton-metre unit has a space between 'N' and 'm'. But this would indicate the 'dot product', wouldn't it? It seems to me that it would be better to write the Newton-meter unit all compact: Nm. This way 'Nm' is clearly a unique symbol, and not a compound unit. If you insist, I might accept: N x m (indicates vector product). Now, in my software (Math-o-mir) I i…

I should have titled this: What kind of information should I know before going into physics education, and are the things listed below among them? I have a notepad dedicated to physics, as reading things isn't really enough to embed things in my knowledge, everything I want to learn, I write down rather than just read. There are lots of pages dedicated to different things, but an example of some of the things I've written down are: phyiscal constants, G, c mass of electron/proton/neutron Pi, Tau, Lots and lots of symbols, from λ = wavelength / Cosmo. constant to = field strength I don't yet know all of these things off the top of my head, and I know theres no need t…

Video games on an oscilloscope https://www.youtube.com/watch?v=aMli33ornEU#t=77

Hello everyone, I have been reading about photometric optics and photometric units recently. I keep seeing several documents saying that the luminance of the sun is 1.6×109 cd/m2 at noon, eg Wikipedia. I tried to use the definition of luminance and some facts about the sun to see if I could calculate what the luminance should appear to be to someone on Earth, just to see if I got the same number as in Wikipedia. Well not only did I not get the same number, but my answer was off by a factor of 1030 too big! I am puzzled because I think I am using the right formulae and all the correct numbers, but still it does not match, so I am wondering where I have gone wr…

I have a project to make a quadcopter fly autonomous. I use a 9 degrees of freedom pcb, wich has a gyro, acceleration meter and compass in it. We are now flying with only the gyro. A gyro however has a few imperfections like drift (and a imperfection I dont know how to call). So a you cannot fly on a gyro alone, so when I search for some answers to that problem I find solutions like the complementary and kalman filters. They combine the data from the gyro and acceleration meter. But how can I use a acceleration meter on a flying object? The acceleration meter can only measure the force on the quadcopter, and the force on the quadcopter is the force generated by the prop…

Curious about negative matter as opposed to the antimatter first postulated by Dirac and later confirmed by the discovery of antiparticles, thanks in advance for your gracious contributions.

Distance between two bodies = R mass of first body = m mass of second body = m kinetic energy of any body of the two bodies relative to each other = 0 cosmological force of space expansion = F gravitational force between the bodies = F There is no another force. How to define R ?

If you make a string that's attached at both ends vibrate, it will emit an almost imperceptible sound. The role of the soundbox is to amplify that sound. My question is : where does the energy required for the amplification come from ? You surely don't add any vibrational energy by attaching a piece of wood. Is it just that the soundbox dissipates the string's energy faster, so that we hear a louder, albeit shorter note ? Thanks for your input, McCrunchy

It is easy to think of photons as being independent particles for two reasons, imo: 1) they are fundamental packets/quanta of energy 2) their sources and destinations can be measured as very distant. But does it really make sense to say that photons exist independently of their sources and destinations? I.e. when a photon leaves one electron en route for another, does it really have a life/existence except as a conduit of energy-transfer between its source and destination? Could photons be just as well described as moments of connection between seemingly distant electrons? Would this idea fit with the idea of quantum tunneling and unlimited possibility for electr…

Hello! I was searching for what new apparatus to buy and found device for Franck–Hertz experiment for 700 usd. http://www.sci-supply.com/Franck-Hertz-Experiment-p/ss20801.htm If you're not familiar with experiment you can read details here http://en.wikipedia.org/wiki/Franck%E2%80%93Hertz_experiment Basically: accelerated electron loses its kinetic energy of 4.9 eV and excites mercury atom, which is then emitting 4.9 eV UV photon. Video on YouTube showing experiment https://www.youtube.com/watch?v=W0GqNtsmaYU Best Regards! ps. They also have a lot of other interesting stuff.. Oil drop experiment apparatus just $430. http://www.sci-supply.com/Mi…

Consider the following thought experiment. Suppose we have two charges in an otherwise empty universe, stationed a distance d from each other. Suppose also that we have buttons we can press that will destroy one or simultaneously both charges. We can easily calculate the potential energy associated with this setup, but what happens to it if we press the 'nuke both' button? Further if the charges are in relative motion and we nuke only one, what happens in the relativistic time before light can reach the second one to 'tell it' there is no longer any potnetial energy?

Hi all, I am wondering could microwave radio frequency melt aluminium pieces. I know that the microwave induces current of metalic object, and create spark between metal pieces. So, with this spark or temperature or thermal effects, could this melt aluminium pieces into liquid state?

Hi guys! I would appreciate your help for this short question. So I am building an escape room (more info in wiki - real life escape rooms) and I basically want to use polarizing lenses to hide a message. I would have a photo frame with a message in it and 2 layers of polarizing lenses on top of each other. in front of the message. I have been given to understand that by twisting the upper polarizing lense you can make the glass impossible to see though or vice verca if you twist the upper lense the other way. This effect is shown in this video. (at 1:50 minute mark) My question is this. Since I am a beginner in field of optics, what kind of lenses should I buy …

Hello! I am new here. I hope your days are going well. I think this would be fun to ask. How big and powerful would a fan need to be to blow away smog from a major city like say..New York city or a major city in china since they have the biggest population problem? We are talking about a single big fan powered by eletricity. (Honestly I think the fan needs a power plant of its own.) What kind of physics are involved in such a monstrosity? how big and heavy would the fan blades need to be?

Hey everyone. To start off, just to let you all know I'm just an ordinary person with no scientific skills or qualifications. Just in a pub at the moment and have a few thoughts! I was pondering with my pint as you do and wondered, in terms of gravity, as a force, can it not be defined in the same way as the weather?. I'll explain. If we look at the earth like the universe, a contained number of atoms within an atmosphere that has various amounts of densities, the earth itself being the largest and the rest diminishing from there. When you have an area of low pressure, weather is drawn into that area, the speed of which is determined by various factors inc…

Hi. Creating this thread to not distort one related to a baseball and an arm... A crossbow of a given fixed force. An arrow reaches say 100 metres. A lighter arrow of same dimensions/aerodynamics will reach farther ? A heavier arrow of same dimensions/aerodynamics will reach farther ? (not about lethality/penetration on impact) For sure, an untralight arrow made of paper will not reach farther. For sure, a heavy arrow made of lead will not reach farther. How is its weight 'tuned' fox maximum flight distance ?

Man taking this Physics class.. I'm just loving every intricacy. There is a beauty I seen in it like no other comparable , when I'm learning Kinematics for the first time and I realize how I can describe motion mathematically, or the fashion in which the concepts of physics interpret the universe for the way she is as abstract as she is in an patternistic, simple, and proportional manner. I love how we take impossibly complex problems and solve them by breaking them down into simple kinematics. I'm definitely in the right science. The discipline of physics is so magnificently beautiful.

Hello: I am trying to determine the wet tensile strength for tissue fibers in units of pounds per ton. All I know is that a wet-strength resin is added to the tissue fibers and is present in an amount of at least 0.1 dry weight percent. Is there enough information to do this conversion? Or what other information would be required? Thanks in advance.

I have to also admit I've never taken Calculus level math. Though I'm concurrently going to take College Physics (Thank God I finally manage to take it) and Calculus 1 together. I'm a little worried, should I be? I've never taken a Calculus class and this will be my first Physics class.

Say a baseball weighs 150 grams. A pitcher can throw it about 80 metres away. If it was made 50 g lighter, would the pitcher reach farther ? If it was made 50 g heavier, would the pitcher reach farther ? For sure if the baseball was a 2 g paper ball, the pitcher would reach perhaps only 8 metres away. For sure if the baseball was a 5 Kg solid lead ball, the pitcher would reach perhaps only 8 metres away. How could a baseball weight be 'tuned' to reach farther, getting the most kinetic energy from a pitcher arm ? ... Or is it already weight-tuned as designed ?

i am interested in determining how strong the weak force is compared to the bigbang because i hypothesize that the weakforce is caused by an explosion. so where is the best place to get accurate data ill need about both of these occurances. and im curious if anybodies ever theorized the weakforce is an explosion. look forward to talking about this with you all.

So, assuming you have all the tools to contain and test it, what would be the outcome be if you put some alpha particles in direct contact with microwaves? would there be any transformation to more stable particles like an ion of He?