Physics

Could this be true? Wouldn't the magnetic field strength have to be far higher if it would work at all?? Gas Magnet

I have a practical thermodynamic, engineering question. I run for a few hours in this season, a dehumidifier in my home and piano shop. If we ignore electrical inefficiency in the motor, are there thermodynamic exchanges heating my house with some fraction of the power (500 W)??? You might be surprised at the heat of vaporization of water, the fact that a pint (a 'pound') takes one thousand BTU's to change phase. I calculate this to equal 0.29 kilowatt-hours. My unit consumes half a kilowatt. I could measure the output in pints per hour, but what are the thermo considerations?

OK, here is a silly thought experiment I dreamt up. Suppose you were to create a black hole with a charge and mass equal to that of an electron. Would you then be able to distinguish the black hole from an electron? If so, how?

I recently saw some designs for an electromagnetic turbine engine. I am skeptical of the design and was wondering if it is possible or feasible. The basic principle is that like a gas turbine engine it will take air and compress is but instead of mixing fuel with it and igniting the mixture, it ionizes the air a repels it out the back of the turbine engine. This is some what like a space ion thruster but i believe its different in the fact that the acceleration is achieved by compressing air and ionizing it. It is supposed to get a double kick, one from the repulsion from accelerating it with a magnetic field of the same charge as the ionized air and other from simply…

How do they inhibit space travel? Man and unmanned? What are current methods of handling g forces? When are g forces experienced in space travel(only when leaving the atmosphere?)? Thanks.

When I measure the IR of a capacitor with IR meter. First I need to charge the capacitor, normally with its rated voltage, charge the capacitor for a certain time. When I use higher charging voltage, the IR measured is also getting higher. Why?

Well I am thinking about a making an egg launcher maybe a trebuchet or something like that, but I was wondering if it would be possible to launch an egg on something like this a great distance... As in about 320 meters or so? I have read that Medieval Trebuchet's could throw heavy projectiles this distance(50kg-100kg) but I was wondering what about eggs cuz they have liquid in the center? And how big would it have to be?

If i charge a plate (+) and under that plate (being contained by something so they won't disperse) are (+) charged ions, if there are enough ions then won't the plate float due to the repulsive force of like charges?

Could someone settle an "difference of opinion" between myself and a friend? He says that it's cheaper to use a 1500W kettle to boil 1L of water than a 2kW. I think you use the same amount of electricity because the 1500kW kettle is heating the water for longer whilst the 2kW is heating for a shorter time thus canceling out the two effects. How can I show him this is the case if of course I'm correct? Ta

Earlier this week i went on a school tour and i was sitting in direct sunlight for 3 hours on the school bus yet i wasnt sunburnt at all ?? I was wondering if UV radiation can pass through glass ??? If not then why?? Does it pass through water(i have been burnt wile swimming)?? Does infra red radiation pass through water or does it just get absorbed ?? P.S I live in south africa 3 hours of light is more than enough to get seriously burnt even now during winter!!! P.P.S thnx in advance

If someone drilled a hole right through the centre of the earth (supposing there was no heat, compression, magma). AND THEN YOU WALKED RIGHT INTO THE HOLE, WHAT WOULD HAPPEN

im not sure on where to put this but i was thinking of a way to make it or something halfway decent with magnets and whatnot bt i was curious can you have just a south pole on a magnet? and just a north? and how would i go about storing energy in a bettery from a revolving wheel with a copper coil?

As a big kid some decade and a half ago I stumbled across an old article from the sixties on metallic glass. It explained how tiny pellets of gold and i think zircon were shot onto a very cold surface, thus forming small metallic discs with no crystal structure - in other words a metallic glass. These were apparently much tougher than conventional alloys but still very flexible and without the ability to develop metality, since you can't distort the structure in a material that doesn't have any structure. Cool, I thought, cant wait to get my hands on this stuff! Now, several years later, I'm just wondering what happened to metallic glass as a concept. It apparently st…

Hello everyone, I have a simple questiom about the DC motor. I understand that in the DC motor the commutator reverses the current to get a constant rotation but my question is why do we really need one. For example in this diagram If the only thing that rotates is the coil and the commutator wouldn't the current always be in the same direction. I mean the only way the current could change is if the whole circuit turns as well with the coil and commutator. Put it simply I don't understand why the current reverses every half a rotation when only the coil and the commuatator is rotating. I made another different topic about commutator in physicsforums and d…

Hello everyone, I got a question Electrons moving through a resistor experience a force if the resistor is in a magnetic field. A resistor is oriented east west as shown with the earth's magnetic field into the page -----------XXXXXX-----------> (Direction of current given) X- Magnetic field into the page An electron travelling through the resistor will experience a force due to the magnetic field which is A Up B Down C into the page D out of the page Ok the answer that is stated is A. Yeah I know you can get this by using the simple right hand palm rule. My problem is I thought electron move in the opposite direction to the con…

a very simple, possibly stupid question. What makes an electron negative, a proton positive? Why do they oppose each other?

Hello everybody, I'm looking for some informations about siphon effect. I have to design a filter with backwashing working with siphon effect. So I don't understand how starts a siphon effect ? What are hydraulics equation to study this effect ? What is the influence about bend's form ? Thank you for your help.

I want to propose a metatheorem about physics. I would be surprised if it has not been stated in some form or another elsewhere by someone else. The Fundamental Metatheorem of Physics Given a space of fields [math]\mathcal{C} [/math] (sections of a bundle over spacetime) with (local) coordinates [math]\phi^{a}[/math], an action [math]S = \int_{M} d^{n}x \mathcal{L}(\phi, \partial \phi)[/math], appropriate boundary conditions and the representation of the fields under the appropriate symmetry groups then all the physics is contained in the above data. By this I mean that all observables, classical and quantum can be calculated from the above with no extra da…

So what holds an electron together? Its a ball of negative charge. But what holds one side of the "ball" to the other side? If it truly is all negative charge then nothing can keep it together as an electron.

I tried to post this once and it did not seem to work so forgive me if it posts twice. I was walkng across a dirt field heading for safety as a thunderstorm approached. I had friends around me. I felt the hair on my body standing up. It felt like someone was throwing sand at me and in my clothes. I turned around and no ne was doing it. A second later all of my friends were screaming terrified, and I asked what was wrong They screamed at me: "You were hit by lightening, didn't you see it, didn't you hear it, didn't you feel it." They said the lightening actually hit me, that it was blinding bright and thunderous (no pun intended). I did not see it, hear it and on…

im extremely drawn in by it, the book "What the Bleep do we Know" got me intrested, i was wondering... how and where did you learn all you know about Physics?

If i had an electromagnetic field roughly 6 feet tall and i "shot" a particle that had the same charge as the field (they want to repel), would the particle go through? Do we have strong enough E.M. fields to stop particles with identical charges to the field from passing through?

If I was to put a (-) charged plate on top of a lot of (-) gas particles, and then surronded the edge of the plate (extending down to the ground) with a magnetic field, wouldn't the plate float due to the like charges wanting to repele from each other?

got a problem. me and my friends are always arguing about the said title's question. i'm always the only one left fending for my thoughts on not being able to. problem is, i'm not a physics student, and my friends are. i tell them that the speed of light stays at a constant. its like, you can reach the speed of light, but it will always be the exact same speed faster than you. need help. i dont want help in arguing my point, but want to know what you people think is the right answer and why.

In space (as in empty space) there is an abundance of hydrogen if i am correct. Why then on earth when we move or fall we experience air resistance yet when we travel in space there is no hydrogen resistance?