Physics

What does it mean to polarize light?

Somebody explain this year old why waves move the way they do and how can I imagine energy transfer? PS:My First Thread.

Would the composition of matter determine the physical reality of phenomena that can occur in a giving system. Basically could a ball of iron for instance by itself become a star, or would a jet aircraft on earth be able to function the same on say Mars of Venus as a more basic example. To try to get even more basic a car most likely could not function if attempted to be used in a large body of liquid such as an ocean, but on more detailed levels such as the use of refraction for example used to gauge where boundaries or different substances may be in regards to our planets structure, does the make up of a system in regards to its matter have a large or minor impact overa…

Is there any observable difference between the physical and electrical properties of n-type semiconductor materials and p-type semiconductor materials?

If energy can't be destroyed, then forms of energy like sound and kinetic would eventually become heat (like if you were to speak or hit a table). Is that right? The other question I wanted to ask was, if things like sound will eventually be changed into an energy form like heat, do the sounds people and machines make everyday put a lot of heat energy into atmosphere/earth? I know that the energy used to speak is very low, but on the scale of all people in the world would it have a large effect?

I have recently started studying the photoelectric effect. I currently have very little understanding of the theory. As i understand it retarding voltage is a voltage applied to the anode and the cathode of a photovoltaic cell such that any photoelectrons emitted are decelerated just enough such that they don’t reach the anode. This is a very superficial understanding, and could be totally wrong. Can anyone help me qualitatively refine my understanding? Also, why is a retarding voltage ever used? Jack.

The metal some glasses are made of is bendy, once bent it recovers on its own, like a spring reguaurdles of how much it is bent. This metal is called metal with memory. If a car was made of metal with memory then during a car crash the car would crumple and stop the passengers and the drivers getting injured. Then it would auto-recover during the next coupple of seconds, just like the glasses?

What is the fundamental origin of electromagnetic radiation?

I was given this question. I have worked through it and get the answers below. I am unsure as to if they are correct or not. The method I have used was never discussed in lectures. An electron with v= 3 x 10^6 m/s enters a region of uniform electric field between two charged plates. The plates are 0.1 meters apart. The diagram included showed the electron entering the field between the plates from the side such that its direction was perpendicular to the field lines which flowed from the bottom plate (drawn horizontally) upward to the top plate. The field is uniform (E=200 N/C) a) Find acceleration: MY WORKING: F= qE = (1.6*10^-19)(200) = 3.2*10^-1…

hello, i was talkin with a phd student, an he said the 2nd law of thermodynamics, was more of a statistical law, an is based of what has happened. So the 2nd law is empirical in nature. Is that correct in saying? or is entropy, a fact, not just somethign made up to fulfill a consistent observation? also, if anyone knows, why is it uncommon to turbocharge v8's.

http://www.geekarmy.com/Science/Cool-Battery-Demonstration.html can anyone explain this? is it even Real? I wonder because only the B stream seems affected, so if both are Equal then what makes B so different?

Purely hypothetical. If you had a body, a planet sized one with a planetary orbit like in our solar system for instance, and you had two of them, with identical orbits, such as one is just polar of the other in the orbit(if that’s possible?) and they both had the same mass and velocity for instance in the orbit, when to composition of such have any impact on the gravity they might posses, such as if one was made of carbon or one was made of oxygen for example. Now baring density from this, just balls of matter of those two types, with exact mass and velocity, would they hold a different degree of gravity, such as more or less gravity?

Does anybody know where I can buy a diamagnetic superconductive disk?

Yes, I don’t have a high level of understanding in regards to tensor stuff so please bear with me. In regards to tensors can time be applied in varying degrees successfully, such as in the billionth of a second to maybe an hour? What I mean is basically can you use time in a sort of fashion to dissect actions/reactions for example in tensor terms? When I think about it such seems very rigid, or how could it adequately describe the motion in the ocean for at least one minute of time, or how each wave on a shore might look exactly for the period of ten minutes or some other increment of time. Such as basically taking matter and energy, along with the various physi…

I got an image for you... ... ok, so If I switch the switch ON, then would the electron flow on the red wire that goes to Load 1 have any change at all? Will Load 1 experience ANY difference if I switch the switch ON/OFF?

Hi, Does anyone know if it is possible and if so how to go about making a metal or plastic (durable material) semi permeable? I may be using the incorrect terminology but basically i need to know if it is possible to change a material to enable it to allow air to pass through however not liquids. One way I thought you could do this was by inserting lots and lots of minute holes in the metal, holes big enough to allow air particles to pass through but not liquids. Another way would be to use a material that has these properties anyway? Does anyone know of such a material? Any help would be appreciated Thanks!

A running track to be built in advance to be directly in the path that the Earth spins so that if a race was held on the track (doesnt need to be an oval) that the runner could in fact run a faster time if they ran in the opposite direction of the Earths spin. Or would factors such as gravity and other forces relative to our atmosphere make this impossible and wouldnt give the possibility of running faster.

Hello I am a student and I need to do lab report. I need information about Wheatstone bridge. if anyone can help me by explain or by supply good website. Thank

Hello. I have a load cell problem. I'd like to know if anybody knows some tips about the design. I have a load cell which has 2 holes inside, conected by a long hole and I have to make it better. That's why I'd like to ask, what will happen if I decrese size of holes, make the holes bigger, get rid of a long hole, etc etc. what are the general rules? Do you have any links with nice materials about it? Thank you in advance and best regards.

hello everyone. Can anybody help me with 2 answers: The first question is that why we have spokes in bicycles i.e what is the function of spokes in bicycles. My second question is why older bridges break down when some heavy vehicles are made to pass through them.. Please do help me with their answers...Thanks in anticipation

So, I'm in Gr. 12 University Physics with no prerequistes and I'm finding some difficulty with an assignment relating to gravity. I need to do well in this class as I have been offered a scholarship but missing the Gr.11 U Physics has made doing well in this class extremely difficult. Anyways, the assignment requires that I consider a society where gravity does not exist. I have to figure out what would be the resultant and I need to know how I can compensate for it in order to sustain life. Here is what I got/questions: -I figure that without gravity there is a possibility of bones decalcifying as a result of there being no weight bearing exercises. So, I thought …

Is the hardiness of a material giving by its bonds or its structure it takes via bonds or configuration in regards to subatomic particles, like the electron configuration for instance. I was on wiki reading up on tanks, as in war, of all things and about armor types. The use DU for instance, more so in the front of the tank and of course various technologies for munitions that would puncture armor and such have evolved also. So going from what I know of say matter and energy, which is not a whole lot, I was wondering exactly what gives rise to strength of a material, being they may be separate in counts of neutrons and so on for example, but all are typically composed of…

I have a question here,A uniform doped n-type silicon substrate of 0.1ohm-cm resistivity is to be subjected to a boron diffusion with constant surface concetration of [math] 4.8*10^{-17} [/math] [math] cm^{3} [/math].The desired junction depth is [math] 2.8*10^{-6}m [/math].Calculate the impurity concetration for the boron diffusion as a function of distance from the surface and how long will it take to cover the distance if the temperature at which this diffusion is conducted is a 1100Cetigrade

As I currently understand it entropy is a measure of disorder, but in comparison to what exactly allows for that definition to exist. I mean if you are to say something is in disorder, that’s to mean there is then an order right, or some other state something should or could be in besides the disordered one. *Side Note. I would also like to know what role entropy plays in string theory, in context of the uncertainty principal if anyone could point me in a direction to read on such that would be great.

wow http://www.tenthdimension.com/medialinks.php some of it sounds unlikely and sort of made up but I guess it is what string theroy is all about.