Material Definition and 1000 Threads

Hey there! What's the strongest material ever-existed? By means of either man-made or occurred naturally. Please attach the links if possible. Currently trying to find out what is material sciences all about. Thanks.

Hi All, Greetings! I have a 3d material and I use result from first principal for getting the potential (U(x,y,z)). I then find average U(x) from U(x,y,z). Now if I write one dimensional Hamiltonian in X direction and use this value of U(x), can I get bandgap of the original 3d material (I...

I'll be linking to this post when the question arises why an implication with a false premise is true.

An industrial makes a volume aluminum cups given "V" shaped straight circular cylinder open at the top. Find the dimensions that use less material. Answer H = R = r = Cubic sqrt (3V/pi) V = pir2h And from here i don't know if it is right r^2 = R2+ h2 as usual I want to make sure

Consider a solenoid with length L and N turns of wire wound around it, filled with a rod of permeability \mu .I want to calculate the magnetic field it produces on a point P on its axis and outside it.The angle between the axis and the lines drawn from point P to a point on the nearest and...

We are considering recovering the silver out of our waste fix solution from the photo labs on campus. What is the best (reasonably acquired) material (as in non-platinum) for the cathode/anode?

hi all, I was wondering if there is any industrial/common type of material (at around temperature of 3K) that can function as bolts/screws or thin sticks. This is to be used in a cryostat and ideally prevent any heat conduction from the material it is attached to during the process...

Are there any material that contact with water and expand? I can think of sodium polyacrylate, but I can't use it. Thanks.

Why do magnets attract ferromagnetic materials only? Why not other materials as well?

can you explain why the trivalent impurities exert lower forces on the outer-shell electrons than the pentavalent impurities? and why The valence and conduction bands in an n-type material are at slightly lower energy levels than the valence and conduction bands in a p-type material?

I am a 3rd year mechanical engineering student at LSU, but my true interest lies in theoretical physics and mathematics (specifically general relativity and differential geometry). I've taken calculus 1,2,3, linear algebra, ordinary differential equations, number theory, discrete math, and...

As I understand it; when an explosive material is set off, the force is dependent on the Amount and the said Material. As an example, I have 2cm3 of dynamite I set it off and once the appropriate "oo's and ahh's" are said I set up eight separate 1cm3 blocks of dynamite and set them up...

Suppose I have a charge inside a conductor as shown in the image I've attached. For any charge distribution: \oint \mathbf{E} \cdot d \mathbf{a} = 0 I can see that if I took some path from the charge, through the conductor, and back to the charge, the integral would be zero still. Now, that...

Is there any materials that is elastically solid (ductile that can be shaped into thin wires) at low temperatures but liquid at room temperatures?

Does anyone have any resources which explain the nature of Alan Guth's 'gravitationally repulsive material'? I would like to understand a basic explanation of how this material becomes a negative pressure at extremely high temperatures. I understand that this arises from GR and the standard...

Hi all, Have any of you ever sent materials such as catalysts overseas? Very much appreciated Marcio

Hello sir, I am new to this forum i am looking for thermophysical properties of heavy water for my computer simulation. following properties i found in the wed. can anyone suggest me that these considered properties are correct (ref temp 40 C and 6.549 kPa) density = 1099.99 Kg/m3 specific...

so I'm told that temperature difference is ultimately what results in heat transfer. But when considering what happens inside a uniform material, if temperature difference was solely responsible for heat transfer, then different heat transfer rates wouldn't exist among different materials at the...

Now we knwo that materials tend to rapidly expand (explode) under given circumstances , like a wire subjected to sudden , rapid overcurrent or like a ball of hot flammable gas when heated or otherwise. Now I wonder what would happen if we had the ball of some heated rapidly expanding gas or...

I'd post in the learning materials section but I am unable to do so there for some reason. Which of these is the best to learn from...

These guys made a stupid and 'fatal' mistake. http://www.washingtonpost.com/world/stolen-cobalt-60-found-in-mexico-curious-thieves-likely-doomed/2013/12/05/262ef990-5d66-11e3-8d24-31c016b976b2_story.html

Backing material -- useful tools at eeweb.com Hellow! I'w like to divulgate this material that I searched... It's nice calculator (is possible to make download) http://www.eeweb.com/toolbox/calculator And some formulas http://www.eeweb.com/toolbox/math-help Do you have something...

All of the related work is in the attachment. If you could please help it would be really appreciated. I've asked a bunch of people in my class, and they're confused also. Thanks in advance!

For microwave. Is it any insulator? Rubber will work?

Hi! I know that material science lies at the interface of physics and chemistry and that any material scientist must have knowledge of chemistry, quantim mechanics, solid state physics,... The problem I face is that I am quite keen on entering material science with a mechanical engineering...

I am just finishing up my first physics course this semester (as a physics major). Although there did seem to be a lot to soak up this semester, I didn't feel like it was too bad. I am just curious though, is there a resource that has a list or other type of reference material that shows you...

I'm not talking about relativistic effects, just solid state physics. I'm wondering what determines the size of objects at the particle, atomic and molecular level, and especially how the constant c enters the equations? I suppose it depends from the strength of the molecular bonds which...

Hi, I am trying to find out what material heat resistant washers are on a BBQ. that material looks like fiberglass and seams to be-able to take high heat loads. Cheers

There is a book that I would like to read "Electronics for scientists" but it has physics as a prerequisite and I will not be able to take a physics course till next year (I would just take the one at my high school but the teacher is not very good and I would rather start with a calculus based...

hi guys, which one of those material you think it should give highest material removal rate by using die sinking EDM. the tool is copper and workpiece are 1. copper 2. stainless steel 3. aluminum lets assume the same input parameters will be used for those three material thank you

Hello, I am looking on building my own water bike after finding out that they start around $1700 like the one pictured in this thread. What designs / materials can make this better? I would like to also have transparent floats rather then the original colors that you constantly see...

So at the college I'm in I'm a freshman Chemistry + (any) Engineering major (don't have to decide on what kind yet). I was set on going Chemistry + Biochemical engineering but when I went to my adviser he told me maybe think of becoming a Material Science Engineer. He said something along the...

Everyone knows that if a light come in a material will change speed(will become less),and from wikipedia I read that light wants to go from his faster way. So when material 'eat' from light some speed,then light as more 'clever',goes from a sooner way.(that what we call "refraction."). So my...

Hello, I am a cycle enthusiast looking to create a shield for my bike in the form of a rain drop which is known to be the most aerodynamic shape. I am looking for a material that is TRANSPARENT (clear, one way mirror finish, or black), STRONG, DURABLE, FOLDABLE, EASY TO MOLD & SHAPE...

Homework Statement The Monovacancy formation energy of a metal is 80 kJ/mol. Hence the monovacancy concentration (CV) at 25 degrees celsius is about: A)1.3x10^-13 B)9.5x10^-15 C).9 D)5x10^15 The Attempt at a Solution I know the answer is B but I don't know how to get to that. I...

I do not fully understand the process of understanding of a material one reads. Suppose someone reads a chapter from a physics book. How does one make sure that one has really understood what she/he had read? I must confess that at times I read from text and I even feel that I had understood the...

these are a couple more math problems I am having trouble with. if you can help me i would appreciate it. if you could just put the number of the problem your helping me with that would be great 1)simplify -3sin^(5)x - 3sin^(3)x cos^(2)x 2.)simplify 2cot^(2)x -3cotx - 9 / cot^(2)x - 9...

Hello to all i am new to this thread and i have a precalculus exam tomorrow. I was going to post 4 or 5 example problems that i have and wanted to know if someone could explain to me how to get the answer step by step. I need to use these explanations as a help guide and as long as its step...

the amplitude of the function -1/5 sin(2/3x - pi/2) is equal to what? 1/5 i think can anybody help?

Homework Statement Lightweight bicycle had been fabricated from aluminium alloy tubing, with joints made by adhesive bonding. When the frame fractured near one of the joints, the owner requested that a repair be made using conventional gas tungsten arc welding. Shortly thereafter, the frame...

Hello Physics Forum, I just wanted to hear from some experienced Electrical Engineers on how much of the material covered in school are actually used in a real job. I am currently a junior in EE and have heard mixed responses from my professors pertaining to the issue. To make it less broad...

hi everybody. i just wonder. can we add new material library in ansys maxwell 3d(v.16) manually. especially magnets?

Old English fascinates me but finding material on the net is difficult, anyone have an idea where to find Old English script?

I have been looking for hours tring to find a material with these properties. Working Temperature up to 500° F Low coefiecient of Friction Chemical Resistance to Costic Cleaners (mainly chlorinated) Coeffecient of Thermal Expansion around 9.5 μin/in°F decent machine ability made in 1/4"...

Sorry for the wording of the topic- I couldn't figure out how to make it fit. If I passed a hypothetical square wave through a material- be it wood, glass, cotton, etc.- would it change to look more like a sine wave?

hey pf! can someone please tell me if my understanding of the material derivative operating over some scalar \rho is correct? basically, from my understanding if we take \frac{ D \rho}{D t} this will tell us how \rho changes as time changes AND how \rho changes as we move our little piece of...

Hi everyone, I'm an a-level student (year 13) doing Physics, Chemistry and Maths. I am struggling of what university subject to apply for...I want to do a subject that is a combination of all three subjects I'm now doing. I like topics that I can go very very deep. I think quantum and...

Hi, I have just completed my undergraduate studies in electrical engineering and looking for options in material science because I have a feeling that is the place where I can get the chance to invent anything if I will ever invent something. The thing is my knowledge is strictly electrical...

For example a phone in a case is dropped, would it suffer more in a plastic case or a rubber case? Thanks

Hello. MechE noob here. I'm an ECE guy and I'm apart of a group of students working on a solar car. I decided I wanted to get more mechanical experience so I joined one of the ME teams. However, before they let you work on real stuff they make you go through smaller projects. So my first...