Physics

Helllo guys, I was wandering why was this the case. If there were 3 resistors (Let's say 100ohms,200ohms,300ohms) in this seriec how can they recieve the same current if resistance is inversly proportional to current. Shouldn't the 300 ohms one recieve the least current. I thought resistors decrease the current what do they really do. Any help would be appreciated. Thanks!! :-)

Hello guys , I got a small question with voltage and charge. If voltage provides potential energy for charges why doesn't the voltage decrease all the time when the charges are moving. I mean I only see voltage change when their are resistors and stuff but my question is shouldn't the voltage change all the time because the charges are losing potential energy as they are moving. Also can you explain potential difference to me. I'm bit confused with that. My electronic undertstanding is not really good and your help would be really appreciated:-):-):-)

Hi, think for a moment that I have a energy generator... but that generator is giving to me a little amperage (exactly some miliamperes). How can I increase the amperage of the generator? Moving magnets arround or anything similar? I want to get the same voltage, or decrease the voltage minimum as possible.

Is black a colour?

Think that I have 2 pack of batteries. In the first pack I have 6 batteries and each battery is giving 1 Volt and 0.01 Amperes, and the second pack of batteries are 2 batteries and each one is giving 0.3 Volts and 1 Amperes. So, we have: First pack 6 Batteries (6(1 Volt, 0.01 Amps)) Second Pack 2 Batteries (2(0.3 Volts, 1 Amp)) Can I obtain 6.6 Volts and 2.06 Amperes, putting all the batteries togheter? I asked the same question to one friend and he told me that I only can get 6.6 Volts at 0.01 or less amps, or obtain 2.06 amps but decreasing the voltage. I have to say that all the batteries are the same kind of battery. Making a serie of parallel connec…

There is any relation between amperage and the magnetic field?

Supposing the critical mass of a fissionable material is Mc, what do you suppose the "starting" mass would be in one of the stock-piled devices of the privileged nations? 0.8 Mc, 0.9 Mc? Too close, it gets a little hairy, too far away it can't be "squeezed" enough. IOW, does anyone know just how much can the mass of a ball of metal be increased, practically, by subjecting it to enormously high pressure? imp

I've noticed that when I dissolve a soluble tablet in plain tap water the tablets dissolves quite quickly, however when I dissolve it in sparkling water it takes far longer. Any ideas why? Could it be due to the extra dissolved CO2 in the water that hinders dissolution?

http://vids.myspace.com/index.cfm?fuseaction=vids.individual&VideoID=31447826 How come the man doesn't take the impact of the car hitting the crates? I know there has to be some law in physics that states why this is. Does anyone know why this happens? Any formulas? I'm curious. I don't take physics yet.

Hi there, When one pours hot food (just cooked hence with no bacteria) in a tupperware and seals it immediately, the lid gets sucked-in as the air inside gets colder (cold air is less voluminous than hot air). I believe this is not similar to air-vacuum sealing (no air at all). However, can one use that "air-shrinking" process as a preservation method like air-vacuum? (since the hot air that shrunk was bacteria-free). Many thanks to those who will bring the light to that matter!

I was wondering... I'm currently living in Cyprus and study in the UK. When I take the plane from England to Cyprus the flight takes more or less 4 hours. When from Cyprus to England it takes approximately 45 minutes more. Same plane, same speed, same distance. Thanks

lol okay this just kills me..Photons are massless energy right? but mass is energy and energy is mass from what i have been taught..so when light hits you, it should have mass and if its traveling at the speed of light wouldn't it just shred us up or create so much thermal energy through friction in the air that we would just like combust?

Can anyone explain how ferrite beads work without mentioning "impedance?" How exactly does the noise get filtered out? Thanks in advance.

What exactly makes it so difficult to obtain energy from what we call "heat"? It seems that by making things colder, we should get the energy back. There's so much talk about global warming, and that it comes from additional energy of the sun, stopped in our atmosphere by CO2 etc. On the other hand, we are always short on energy, always looking for more sources, nuclear and what not. It would be wonderous if we could use the first problem to solve the other, would it not?

i was just wondering, despite sound not being matter, what happens when two similer sounds or identical sounds hit each other? and how would this inpact the sound?

The Asian Tsunami two and a half years ago unleashed tremendous amount energy on the coastal regions around the Indian ocean. What do you think would've have happened to this energy if there had been no water to carry it away from the earthquake? I mean, if the earthquake (of the same kind and magnitude) had taken place on land instead of the sea-bed as it did, presumably this energy would've been present. How would it have manifested? As a more violent earthquake? Or a longer one? I picture the earthquake (in cross-section) as a cantilever spring being held down and then released. The spring then transfers the energy to the tsunami in the form of potential ener…

im interested in finding out more about ultrasonic & acoustic levitation. how mutch can it lift? what would it take to lift... say a glass?.

Hi, I'm stuck on a question that asks why is the wavelength in a closed pipe longer than the wavelegth in a open-end pipe. I know by diagram the wavelength of a closed pipe is 4 times as long as the pipe (natural harmonic) and the wavelegth of an open ended pipe is twice as long. does someone have a good explanation (in words) why this is? Thanks Oh and I'm new, is there a list of symbols I can put into posts? like lambda and the f for frequency.. I looked thru the latex ref but cant seem to find any. Thanks for all the help

How can be used the magnetic field created by machine to get energy? I mean something like this: In this video a static charge is discharged (used) you can see that in the last part of the video. Can be done the same with the electromagnetic or magnetic field? Based on the Joseph Newman motor, The higher the time constant of your coil, the greater magnetic field you produced for a given power supply. But... that magnetic field can be used to get energy? And another question between em energy and electrostatic energy... Can I transform one kind of energy into another? I say, the electrostatic into em, or the inverse?

Hello. I am interested in the following question. Imagine Michelson–Morley experimental plant. Whill we see the changes of the interference picture if we set up the glass box in the way of one of the beams.

such as a photon, why do they travel in a wave because is a straight line the shortest between point A to B. i know its the waves that gives them properties (like its the wavelenth that differs a xray from a gammaray) but i still dont get why they have to travel in waves?

1) To my knowledge, waves transfer energy right? 2) E=mc2 means that energy and mass can be interchangeable? 3) so does that mean that waves can also transfer mass? [because of statement 2] If waves can transfer mass then why haven't we summoned the ability to teleport?

You know that the a fan (like the pc fan that cools the processor) needs a quantity of energy to work. The most usually are 12V to work Ok. Some days ago, I have seen a video where a guy moves a fan to make energy. That guy used the help of a blowdryer to move the fan at a high speed. The video shows that moving the fan at high speed you can make power to run a device (in the video was a led). So, if you have a motor, you can have a generator if you inverse the process (you move the fan). My question is, If the fan need 12V to work properly... How much energy can I obtain if I move the fan? I know that It depends of the speed that I move the fan, but I want to kno…

I hope I posted this in the right place. I was thinking today, that since matter cannot be made, or removed from the universe, perhaps we are constantly expanding as well. Since the universe is constantly expanding, that must mean we must be expanding as well, since the universe cannot just make more matter as it expands. For all we know, we could be 10x bigger than we were yesterday, and never know it. This would explain black holes not being shaped as thought, but more of an hourglass, as matter goes in one end, and comes out the other in a different form. I know that Hawking has thought of that, but the first section is completely my idea. Please tell me what you…

Is nuclear power ethically right? I'm not sure whether this question is correctly placed in this section but okay. I'm not really trying to start a discussion I just want an answer to the question of the poll. This is for my research project and I need it urgently, picking yes or no won't take you a long time, please do this for me....