Materials Definition and 989 Threads

Hello, I am interested in making a homemade radio receiver out of common materials. Do you have any suggestions or websites I could get some ideas from? Thanks. I.

Homework Statement Homework Equations Torque = F. d Distributed Force -> Concentrated Force = w.d The Attempt at a Solution Concentrated force is equal to 40kN and I have found the B(y) as -10kN by taking moment with respect to the A point. And from the equilibrium A(y) is 50 kN...

Homework Statement A 60-cm long gold wire is soldered to a silver wire of the same length as shown in the diagram. If each wire is 2.00 mm in diameter, determine the equivalent resistance of the combination between A and B. Diagram is attached. Homework Equations R = ρL/A The Attempt at a...

Hi, I wonder is it possible sound wave heat material that high that the material goes up in flames? Or what other type of frequency can make some materials burn?

Hello All, I am currently a junior in physics and have set sights on Materials Science (Electronic Materials/Nanotechnology) for grad school. My school does not offer MS.Eng as a degree and so the only Materials Science course I can enroll in as the general "Introduction to Materials Science...

Cross posted this in the materials forum but i received nothing so I'm posting it here. << Mentor Note -- OP has been reminded not to cross-post at the PF >> So the application is in a pedal set for a racing simulator cockpit. The brake pedal has a high resolution pressure transducer that...

Hello all and thanks in advance for the help! I am currently working on creating a lighting fixture that will be suspended over an aquarium. What I am having trouble with is determining a safe material and thickness for the spars going between the lights (see below). My goal is to have these...

Homework Statement This isn't a homework question but something I'm working on that I thought should be simple. Two disks (area ##A## and thickness ##d##) are joined together and placed under a radiation heater in vacuum, so that one side of the top disk is heated with a constant power. Assume...

Dear All I am trying to study Topological superconductors but i have no idea about it. Can anyone suggest me an introductory book to start with.

Hi Dear, First of all I thank the administrators and the whole team that runs this forum for having accepted me to be part of this great family and also for the quality of this forum. So, I have a question regarding conductivity which is an inherent property of material, Currently I take a...

Which materials would be best for an IR reflective/opaque coating to improve the efficiency of ceramic insulation materials for use in kilns and furnaces, meant for continuous use at up to 2500 deg F? I understand that materials might be useful for different wavelengths of IR, so details...

I wish i had one book or pdf to learn about different types of fractions . Please help

For materials that have a propensity for necking, assuming they're heterogeneously structured/have equal strength throughout and are without defects- why do these materials have a propensity for necking in the center when forces are applied to both ends? I'm trying to use physics to explain...

Hey all! Undergrad in M.Eng here, building a desktop robotic arm (<12 inches tall, arduino board) for a personal project. I've been looking at materials, and aluminum and wood are both doable, but if possible I'd rather use a lighter material that I can cut without machines, such as a strong...

Okay, I will give a quick run down of what I am trying to do here. What I want to do is build a tesla turbine from old hard drive disks. Being that they're already rated for high RPM, it seems like a viable option. Now these disks are probably going to be aluminum and I am probably going to buy...

Hi, I am carrying out some tests using the laser image transfer method, where the image of a circuit is put on a PCB as an acid resist, so leaving the circuit in copper. My thread PCB by Laser transfer. My method is a 'sandwich' of two stiff plates app 110x160mm bolted at the edges...

I want to rewind the stator winding of an automotive alternator. Want insulation materials I need for that ? Thanks for help Sam

I have the choice of 6ECTS, and I will use it on either a Mechatronics course or a Materials Science course. My field is biomedical engineering, which course would you recommend, does either of the courses pre-requisites the other?

Hi guys, I've got an exam in a few days and my lecturer is unresponsive, so wondering if you can help me. The question I am solving is the following: Calculate the impedance at the surface of a layer of spruce wood of thickness d equal to 2mm, and of density rho equal to 0.47 Mg/m3 at...

I'm interested in finding out what the coefficient of friction would be for a few different materials such as:Copper on aluminum Copper on graphite graphite on aluminum I'm not sure if it matters if the order is reversed such as Aluminum on copper vs copper on aluminum.. also I've seen that...

I have some more detailed questions on this further on but I found it better to start with a very basic question first: If higher temperature is correlated with shorter emitting wavelengths, how come there are incandescent light bulbs that emit yellowish light but are hotter than incandescent...

I have a 30 by 30 pole barn type garage that is my workshop where I am trying to restore an old 68 Mustang of my grandfather who passed away. The trusses are 2x4 and are four feet apart. My thinking was to create a beam that runs perpendicular to the trusses about 10 to 15 feet from the edge...

Cherenkov radiation is described as being generated by a charged particle moving through a dielectric medium with a velocity greater than c/n, where n is the refractive index in that medium. Since n varies with frequency, there is a cutoff where n drops below 1 and no radiation is emitted above...

Hi Everyone - I have a classical E&M physics problem that I've been tearing my hair out over. It relates to how ferromagnetic materials boost the field strength of a non-uniform magnetic field. My takeaway from college physics class was that (assuming there's no saturation in the material) the...

Hello! I'm a high school science teacher who was recently switched to teaching physics for the first time mid-year. I remember doing an electroplating demonstration in my gradeschool days for a science fair. It was fascinating and now I want to give my students a chance to do some hands-on...

What do we mean by a discharge voltage of a material ? and is it good to have a low one or a high one ? Thank you.

I am aware that there needs to be two materials for there to be a coefficient of friction, but I mean in general. For example, I know synthetic setae are very resistant to slipping on surfaces.

Hi all, I have been accepted to a few schools for nuclear engineering (masters and phd programs) and wanted an opinion on which school has the best groups for nuclear materials research? I have been accepted into the following programs: University of Michigan Texas A&M University Berkeley...

I have a project which requires me to get 5 very specific images of an object from various angles. The user can't use their hands because it would be too shakey and introduce error. These images have to be precise and steady. So that's why I need to build a helper camera mounting device to help...

In mechanical engineering we have various courses in strenght of materials, and I've noticed that graduate students learn the Theory of Elasticity. I've researched a little bit about it, and I know that the Theory of Elasticity is more general than strenght of materials. But I have some doubts...

If I was to throw together I variety of radioactive materials into a pot, what would be the interaction between the different materials? If I threw together Barium and Polonium, what would happen? What if I added Cesium, Europium, and Strontium to the mix? What about throwing in Uranium? Will...

Hi there So we have a group design project in my mechanical systems 2 class and it basically goes as follows: design a mechanism to cut a half inch aluminum bar in half using a standard hacksaw blade and 4 AA batteries. You have to use a motor w/ input > 5000 rpm for the 'main' component we...

Homework Statement Hi! So my question isn't really about a specific problem, but more of when to use which method. I'm having trouble knowing when to use the method of super position, the force method, or just being able to go straight into just writing the equilibrium equation and the...

Homework Statement Imagine I have a 3.5 kg brick at 80 °C that I put in 10l of water at 20 °C. What will the final temperature of the water be? SHC brick = 840 J kg-1 °C -1 Homework Equations E = mc∆θ The Attempt at a Solution First I calculated the energy available from the brick to heat...

I am looking for resources on the physical properties of the various components that make up the human body. As an example of what I am looking for; If we look at the finger, we know it has bones, skins, nails, blood etc. What are the various physical properties of these different parts...

This is a general question, not a homework question, and @berkeman said I should post it in the EE forum... I'm trying to get a better understanding of the relationship of dielectric constant (relative permitivity) to dielectric strength (breakdown voltage).I want to know what happens when you...

Why in most practical applications, most materials properties are given without specifying crystal directions. Are they trying to say all materials are isotropic?

I'm having someone make something for me. I wanted to know the best way I could test a whole bunch of different materials with different friction, texture and tactility. Where can I get a load of samples to test? I may have to reach out to different sources and purchase the different materials.

Is there a way or process to neutralize the radioactive properties of a material (i.e. Make a radioactive substance stop ionizing it's surroundings?) Alternatively, since the gamma radiation penetrates through materials the most, is there a way of "slowing down" the frequency (lowering the...

Hi everyone, I am having problems figuring out how to solve a particular problem. Because I was not able to access PhysicsForums recently, I typed everything about my issues into a pdf file that I have attached below. I am grateful for your help in advance, and make it a great day...

Dear All, I am looking for a method to calculate the friction stresses created in 1 mm thick, fully supported, slide of soda-lime silica glass. In this experiment a 1/4" ball bearing of various metals is being translated over the glass surface under a constant load of 2000g. The glass slide is...

Hi, I am looking for some guidance on a problem I am trying to solve on laminate analysis. This is a flat laminate (9 plies with a thickness of 0.125mm) of unidirectional carbon fibre reinforced plastic with a stacking sequence of: 0/60/0/-60/90/-60/0/60/0. Ply properties are as follows: E1 =...

Hello, everyone! Let's say I have an XRD pattern which has broad reflections. I don't know what material it is (don't know what temperature and conditions it is made). How to know whether those broad reflections are from nanomaterial or amorphous material?

Hi everyone, I am part of a senior design group that is building a dynonameter to test shocks. We are ordering parts tomorrow morning and so I want to make sure that I am not missing anything. I do not have any experience with VFD's or three phase motors but I am doing my best to research and...

Usually people talk about magnetic confinement schemes or some such thing for fusion reactions presumably because the pressure and temperatures would vaporize/destroy all conceived material vessels too quickly. I would like to hear someone talk about the limits of materials in this realm. So...

Specifically, for a high schooler with only basic physics and chemistry knowledge who is interested in the field

Ive been trying to work out these problems for 2 days now. I've read through the book "Statics and Strength of Materials, Second Edition" By: Cheng. I've googled Everything. I've been on other Forums and have got no reply. I've tried Facebook Math Pages. No Answers. I've been Looking for free...

Really odd question for you guys but I'm curious about your input, and apologies if it's a foolish question to ask anyway(I'm a CS student and this came up in a discussion with a classmate of mine). So I know this is a fairly odd thought and not likely practical in any real world scenario, but...

Homework Statement How does the compressive strength of concrete samples compared to the expected compressive strength of cured concrete. If different explain why. The Attempt at a Solution I think the question is asking what is the relationship between time and curing. And I think that the...

Homework Statement Consider a two-layered cylindrical wire with inner-layer permeability μ1 and outer-layer permeability μ2. A line current I runs through the center in the z direction. Calculate the bound currents and the magnetic field produced by the bound currents. Homework Equations [1]...