Materials Definition and 919 Threads

Homework Statement A) Which of these materials will feel a force from a permanent magnet - wood, aluminum or steel? B) Will the materials that are attracted by the magnet be attracted to the north pole of the magnet, the south pole, or both? Homework Equations The Attempt at a...

Hi, everyone! I am undergraduate student from China. I am applying to pursue a PhD degree in United States next year. I am interested in nuclear materials, but the problem is that my home school offers little course on materials science. I am affraid that students of materials science may be...

Hello. I know very few things about solid state physics, so my question is very basic.. I'm just searching for a clue.. Have some of you ever heard about, or imagine a way, of decreasing the permeability of a ferromagnetic material? Not by raising temperature, but with electric field or...

Homework Statement QUESTION 2 (Total 20 marks) Figure 4 below shows a diagrammatic section of the floor of a typical house suspended over a garage. The steel beam shown in section spans 7.2 metres centre to centre of supports. The floor, including an allowance for the self weight of...

I'm working on an assignment about phase diagrams and one of the topics we skim is isomorphous phase diagrams. As a topic its easy to grasp and the copper nickel diagram is a good example, however I was wondering if someone can outline any other isomorphous materials because I would like to use...

Hi everyone! Im developing an application with a physics library. In the application I pre-setted some materials with the following properties, Density, Friction and Restitution Im not sure if this informations are truly trustable, Can you guys just review this for me...

Homework Statement what is the relation between reflectivity, emissivity, and absorptivity for an opaque material? if an opaque material's reflectivity is 0.075 for solar radiation in the visible range and 0.95 for radiation of a heated surface of 80 degrees Celsius in the far infrared...

Homework Statement Find the capacitance of the capacitor shown in the figure. Asume H << L. http://imageshack.us/a/img39/1935/capacitor.png Homework Equations Capacitance of a plate parallel capacitor with a dielectric material e: eA/H where A denotes the area of the plate, and H...

Does anyone know of any good materials to make pipe out of that can withstand around 200 psig, 250 F and is completely non conductive? Would also be nice if it was durable to external bumps and drops as well. Was thinking carbon fiber but that won't handle high temperature.

Homework Statement I have to do the following practical, but I am unsure of how to calculate one of the variables. We are doing this test and we are given this information to calculate E. I have equations on how to calculate R and I, but I am not sure how to calculate M. It's...

I'm curious about the compatibility of a whipple shield and bremsstrahlung prevention(like that provided by paraffin). Until a short time ago, I was under the impression that bremsstrahlung is only generated when a charged particle collides with a metal. This is apparently not the case. So...

Dear All, I am looking for contact address(es) of university institution(s) where i could send samples for characterization. I work using XRD, EDX, SEM, IS(impedance spectroscopy analyzers-upto GHz frequencies). Also, DTA/DSC/TGA, UV-Vis and NMR, among others, principally. I Work...

I am interested in starting to research into the acoustics of speech and music. In particular I want to analyze the spectral profile of human voice in hopes of finding relationships between it and music. A possible future direction for this research is to improve synthetic speech to mimic...

Hi I'm dbmorpher For my local History fair I am basing my report on the Indutrial Evolution and it's Inventions namely the Steam Engine. I wanted to know if there was an easy way to make a steam engine that was or had... Low cost parts No fuel such as coal or wood No need for complicated...

Hello. I'm conducting some experiments to test for the pressure exerted by a thermally expanding cylinder inside a tube. The cylinder is placed snugly inside the tube, usually with zero to a few 0.001s clearance. The cylinder has a higher coefficient of friction than the tube, therefore we...

I recently graduated from NUST, Pakistan completing my Bachelors in Materials Engineering. I've applied to several industries within and outside Pakistan but so far the response has been disappointing. I've been confused regarding where to start. There are a couple of questions I want to ask...

I had a thermal conductance homework problem where heat flowed through gold, and then silver. Both materials were of the same length and same cross sectional area. The problem mentioned that the energy transfer had reached a steady state, and I found through doing the problem that under these...

Homework Statement Calculate the force of attraction between a Ca2+ and an O2- ion, the centers of which are separated by a distance of 1.25 nm.Homework Equations Attractive energy (E) = -(A/r) *The constant A is equal to (1/(4∏ε0))(Z1e)(Z2e) where ε0 is the permittivity of a vacuum (8.85 x...

Hi, I am trying to figure out how to calculate the permeability constant of a lot of plastics by making solenoid (because that seemed to be the best method of doing so). I am currently using: μ=Ll/((N^2)A) to calculate that constant. Using this method I will only need an induction meter...

Hi, I wanted to ask a question about graduate school, programs, and ask for any advice on what I should do/plan for my future. I'm currently a Senior majoring in Biochemistry (B.S.), minoring in Mathematics, with nearly 160 credit hours and a 3.78 GPA. I have a strong mathematical and chemical...

Hi I was wondering about an issue i thought about while attending a masters thesis dissertation earlier does the material of the plate (not the filling dielectric) affect capacitance (even if in the fringing level) ? Check the attached picture , for a better explanation

Hi everyone. I have the following question: on passivated copper sheets used under high electric fields I found some color patterns I can't really explain. A possible explanation would be that there are some thin layers of material on top of pure copper, for instance the copper dioxide coming...

Two questions here. From real-world problems, I was hoping someone smarter than me could explain the physics behind some issues I was told about. It's been a long time since I looked at an engineering or physics book, so please bear with me. 1) For a 3-phase motor, I was told that someone...

Are materials scientists and engineers in relatively high demand compared to say, electric or mechanical engineers? Which degree would be best if I want to work in the "energy" field? And what kind of energy would each be dealing with?

I've been reading about fluorescence and I understand how the band-gap accounts for reemission of photons at a longer wavelength. However, can a material store a photon, and then given an external energy source reemit at a shorter wavelength? I'm imagining an electrified "glass" that could...

I was seaching mechanics of materials books, but i need them to be tensor based. Any sugestions?

I'm torn between the two options, and I would appreciate it if someone with experience could help me contrast materials science with materials engineering. From what I've heard, materials science ultimately leads towards research, and development of new material. Materials Engineers, on...

Hi I am looking for some thin and light heat insulation materials probably in a flat plate form. We intend to install this kind of heat insulation plate underground for separating different utilities. Any suggestion ? Thanks alot.

Hi I am looking for some thin and light heat insulation materials probably in a flat plate form. We intend to install this kind of heat insulation plate underground for separating different utilities. Any suggestion ? Thanks alot.

Homework Statement A composite rod is made if copper and wood joined together. a piece of paper is filled in close contact with both rods bear the junction of wood and copper. The rod is passed several times through a bunsen flame. What will be observed and why? A: the portion of the paper in...

I am looking for a good book that covers magnetic properties in materials. I've taken E&M (we used Purcell), and it only covered magnetism in materials briefly.

From another thread I think I understand that ferromagnetic material can exist any time, but dia & para magnetic materials exist only when there is an external field. My overview is Macroscopically ferro materials have to align their domains & can remain aligned when field is removed...

I'm looking for some study materials regarding Closed time-like curves (CTCs). Be it a book, paper or anything other. It is highly accepted, but I'm particularly looking for a book that includes it and similar topics.

Homework Statement I have to find two methods used to measure the density of a solid material and one method to measure a liquids density Homework Equations n/a The Attempt at a Solution got one method for the solids and have written this but my teacher wants me to find the...

Homework Statement A capacitor consisting of two parallel plates of area A = 7.3 m2 and spacing d = 0.150 m is filled with two parallel slabs of dielectric material of equal thickness and with dielectric constants 1 = 3.20 and 2 = 7.50, respectively. What is the total capacitance? k1 fills...

Hey, next year I'm going into University. I will be taking a more computational-style calculus course, I believe the textbook will be by James Stewart: Single Variable calculus (my assumptions), and I will also be taking Physics. I'm wondering if you guys could give me a list of helpful websites...

Hey! I just saw a video on youtube from the guys at nothingham university (sixty symbols) where they explained that some materials are transparent due to the energy gap between the excited states of the electrons in the material. If photons come in at lower energies they will not interact with...

I was just wondering if it was possible theoretically to move or attract large/heavy materials using polarisation. For example I've heard examples that if you have a charged rod ,and you bring it close enough to pieces of paper the charge on the rod will polarise the paper and then if that...

Can anyone recommend me a good Engineering Materials textbook? Here is the course description: Introduces the physics and chemistry of engineering materials including metals, ceramics, polymers, and composites. Covers the relationships among the processing, internal structure, material...

Homework Statement Use Gauss' law to find an expression for the electric field within a charged parallel plate capacitor with two layers of dielectric materials (?r1 and ?r2). (See attached image, this is for question 2a). The Attempt at a Solution My approach would be to split the...

Hi I am new to this Forum as well as thermodynamics. I need to find the amount of heat required to change the temperature of two given materials (iron bar and sand), from 25 deg C to 120 deg C. I have two steel tanks, one for holding each material. Both the tanks have the same dimensions (1m...

Hey came across this question in my physics textbook. If the surface of a material is under compression, is it hot or cold relative to the body of the same piece of material? Unfortunately their explanation doesn't make any sense what so ever! Would anyone like to give an explanation that makes...

The speed of light in vacuum is 1 / sqrt(mu_0 e_0). In matter, this is modified using relative permittivity and permeability, so the speed of light in matter is c / sqrt(k_m k_e). In diamagnetic materials, isn't k_m < 1? Then we'd have light going faster than 3 * 10^8 m/s in, say, nitrogen...

in physics we have to drop an egg 30ft and the only materials we have is 60cm of half inch thick clear tape, three sheets of paper, and four straws I am thinking about making helicopter blades for it and putting it in a modded paper water bomb with straws and paper bits as cushions but idk if...

Hello, I am building a mousetrap car for my physics class. I have looked at other threads for the best materials and designs but none of them have helped me much. I was wondering if anyone could give me something new to work with. I would like to have a three wheel design but my main...

Is a part list equivalent to a bill of materials?

Homework Statement I am having trouble with question 1 on the attachment posted. I understand that i need to get the area of the 2 bars. I am just not sure what to do with the forces. ALso i know the picture may be dark. P2 starts at point B and is pulling to the right and P3 starts at...

I am a Physics major/ Math minor and would like to know what sort of undergrad upper-level math classes would be the most useful for Condensed Matter or Materials Science Theory?

Why does necking occur during tensile testing of ductile materials?

Homework Statement a beam is 12 cm wide and 10 cm long. Find the neutral axis, the area centroid and the distance between them. Homework Equations Yc=h/2 The Attempt at a Solution Yc=10/2=5 cm. I can't seem to find the area centroid of a rectangle. Any help? Thanks!