Material Definition and 1000 Threads

Homework Statement Suppose you know the wavelength of light passing through a Michelson interferometer with high accuracy. Describe how you could use the interferometer to measure the length of a small piece of material. 2. The attempt at a solution - Sandwich the piece of material behind...

Homework Statement Stewart Calculus 6E: 4.7 #14 A rectangular storage container with an open top is to have a volume of 10m³. The length of it's base is twice the width. Material for the base costs $10 per square meter. Material for the sides cost $6 per square meter. Find the cost of...

So I have been reading about the cross section of neutron capture and have been reading about how the cross section for neutrons in a given material depends on neutron energy, the most important factor obviously. But I have not seen as much information on how, for a neutron of a given thermal...

I took the first part of the college-level introductory chemistry classes (it's CHEM 1211 here). I took it a long time ago - 2002. When I took it, I didn't pay attention, it's a miracle I passed the class at all. And now I need the second part of the class. I'm worried that I'll be missing...

what is nano? how to obtain nano material ?

There are several online materials on general relativity. Here I would like to get suggestions about concise review of general relativity at somewhat advanced level. The idea is that this should be enough for recapitulating the area at advanced level by somebody who had studied it thoroughly...

What is exactly is a "non-conducting material"? Homework Statement In many Gauss's law problems, we are often presented with "consider a nonconducting sphere with radius..." I realize most of the time we aer suppose to assume it is an inductor, how are we to know it is NOT an...

or a hoax? http://www.telegraph.co.uk/technology/5158972/Starlite-the-nuclear-blast-defying-plastic-that-could-change-the-world.html Seems there was only 1 post on PF in 2004 on the subject, but it seems to be resurfacing. What happened to it? Is it a hoax?

Fairly simple question: If a highly permeable material (of any shape) is placed in a uniform magnetic field, will the material's magnetization density always line up with the uniform magnetic field, or do I have to take into account the fields that are created as the material becomes...

This is Grade 12 Physics lab assigned to me : Bonus: Performing the lab+making a conclusion to answer the research question. I thought whole day but can't think of any research question with box of matches. Could anyone please help me out with this?

I recently found out that every LaTeX expression I type is displayed in a new line. I had to search https://www.physicsforums.com/showthread.php?t=499624" tread or any of its links. May I suggest that how to type inline expressions be included in the LaTeX learning material? It would be...

Treating the object as "material point" in kinematics From the kinematics questions I need to solve, I notice a lot of time they mention to treat the moving object as a "material point" (I translate how they write it in Hebrew). I wonder exactly what is the meaning of it? Do the kinematics...

Hi everyone, I'm having trouble identifying the material used in the oil seal of a hydraulic gear pump. There is a picture of the microstructure of the oil seal with it's hardness. Any ideas? Cheers

Material Science Questions... I finally got to exercise a bit of material science. I'd like to know whether what I'm saying correct or no. I also ran into two issues with Brinell's hardness calculations and SEA chart. I'd appreciate feedback! :) 1) Decreasing the size of the nucleus causes...

Homework Statement The streamlines of a fluid are as follows: x = (x0) + 3(y0)t^2 y = (y0)/(1 + 2t) z = (z0) + 5(x0)t Find the velocity and acceleration fields in the Eulerian description (local). Homework Equations Total/material acceleration: Dv/Dt = dv/dt + v.grad(v) The...

Can we know something of the distribution of planets material in general? I mean, the percentage of solid, fluid, gas planets in general (maybe theoretically) in solar systems. And percentage of planets with atmospheres?

In building a subterranean heat sink for a greenhouse , what would be the best material to use in the heat sink through which the hot air of the greenhouse would be travel to warm. that is what materials would absorb the most heat easily and at the same time slowly release that captured heat...

I'm in full agreement with a Big Bang start of our Universe. However, I am a little perplexed as to where these staring materials originated from. Now, I know that there is no solid answer, but I was just curious as to some theories. Thanks.

Hey guys I'm looking for some good reading material on the following extrasolar planet detection techniques (not sure if there are any other...) Radial velocty Transit monitoring Microlensing Detection of IR thermal emission Direct Imaging. Basically I'd like to read about what these...

Just a thought experiment... Cover a metal plate with a material of relative permittivity 0 on one side. Then place a charge on the metal plate. The system as a whole will accelerate towards the metal side since there is no flux on the covered side and so the charge is accelerated in the...

Is it true that the viscosity of a glass is a function of its temperature. Yes or No? Thanks

So, I have this book that doesn't explain why you have to first find the domain, consolidate logs, solve the function as a rational inequality, find the key numbers, then find which numbers of the key numbers are actually in the domain according to the inequality, and finally write out the...

What is 1111 phase in material science Hi Guys, I wonder if someone tells me about what are the rules for nomenclature of phases in materials. Generally I read like 1111 phase, 122 family, 11 system. I don't understand completely about this. Does they talk about composition or something else...

Hey Guys, here is a skeleton for an exercise I need a help with: In this Problem we have a beam EF which is pin-supported at E, a Rod CD which is enrolled by a spring ( spring constant =k) and a rod AB (AB is touching the ground, I forgot to draw it). If we heat the Rod AB what will...

1. Homework Statement A block of a certain material begins to slide on an inclined plane when the plane is inclined to an angle of 15.64°. If a solid cyclinder is fashioned from the same material, what will be the maximum angle at which it will roll without slipping on the plan 2. Homework...

what is meaning of test performing on bulk material & conduction with complete insulator.

I am planning to build a http://solarcooking.org/plans/DATS.htm" that van cook food as fast and hot as possible. I was wondering what is the best reflective material for concentrating the sun's rays into a single point. A standard mirror is obviously the best because it's 100% reflective...

I would have posted this in one of the educational forums, but the instructions there seem to indicate that only educators and mentors can post to those forums. So I will ask here: I am looking for sources where I can purchase home education courses on science topics, especially in the physics...

I was thinking that since the density of something is as much dependent on the molecular structure as the atomic, that there should be some leeway here.

Is there a certain material that absorbs X-Rays so that the X-Rays don't escape. Or rather, is there a material that stops the X-Rays from continuing. If there is such a material, is there a way to change the X-Ray into an electrical current?

There are certain properties of materials that are "artificial" in the sense that they have no direct physical basis but are sort of added into the evolution equations to get the right effect. I don't mean to sound like they are arbitrary but that they are more empirical and not directly...

We have a customer asking us for the thermal conductivity of a product we sell. None of the engineers have that number. I can think of a simple experiment that might do it, but I don't know the math. I want to take a piece of this material (it's a pipe), put a cap on the bottom, then...

Homework Statement A fission reactor produces 300 MW of electrical power with an efficiency of 30%. Calculate the mass of 235U consumed by the reactor in one day. Homework Equations Power = Energy/Time E=mc^2 The Attempt at a Solution Using the above equations I got an energy of...

the assignment is written as follows: A parcel is attracting nervous attention at australian post. the parcel is radioactive and inspectors are trying to identify the material. Suppose they make the following measurements. There are 50 grams of the material and it's decaying at a rate of 0.25...

How hard can something be without being easily breakable?

I'm working on a computer model that simulates material damage in fiber reinforced polymers in extreme temperatures. I have looked around to find where I can buy some and get material properties. So far the best place I have found is Rock West Company with their quasi-isotropic lay...

I wonder to know where the lower limit for solid substances’ density is. We know that some solid materials are lighter than liquids (ice, wax and etc), but can the solid material in principle be lighter than air? For example the density for Carbon nanotube is at least ten times less than water’s...

Hi guys, I need a bit of help in making a decision on a particular material. Basically, i am doing a project where I will be heating water in a bottle. I have an idea of using a dynamo to provide the energy to heat the water. In order to be able to do this, I need some advice on a material...

Alright, I have a noddle scratcher..at least for me. I understand light can slow down and speed up as it moves through different materials. I know light cannot exceed the speed of light (c). I know at the speed of light time is instantaneous or stops - same difference. So my question is...

Homework Statement Show that, for an inviscid fluid, we have \frac{D}{Dt}\bigg{(}\frac{\mathbf{\omega}}{\rho}\bigg{)} = \bigg{(}\frac{\mathbf{\omega}}{\rho}\cdot \nabla \bigg{)}\mathbf{u} - \frac{1}{\rho}\nabla\bigg{(}\frac{1}{\rho}\bigg{)} \times \nabla p Homework Equations Euler's...

Is there a difference in inductance of an inductance with magnetic material whether it is magnetized or not. Meaning is there an increase of inductance if the core has been magnetized ( become magnet) vs the same material but not magnetized? Does magnetization increase the \mu of the material?

Homework Statement If we have 3 materials with the same thickness but different indices of refraction (1st= 1.33, 3rd=2.419) which would take the longest time for light to pass through? Why? Homework Equations n/a The Attempt at a Solution I want to say it's the third one simply...

Hi a group of us are developing a new system, but are unsure of what material would be best to fulfill a critical role. The system requires steam to be stored at pressures of upto 20 ATM, and at a temperature initally of 2300 celsius. What materials would be best suited for this storage...

Hello... first of all, this is my first entry, couldn't find anything similar with the search function... so here is my problem.. Out of personal interest, i want to know if there is a formula to calculate the stress on a block of metal with two holes. One of these holes will be used for...

Hi to every one I want to simulate Rf lab plasma and DC glow discharge plasma But let me make clear one thing Consider me as a starter to both plasma physics and simulation So is there anyone who can help me in this respect to guide me from zero Regards

I'm currently in the process of designing a golf application. Because of what it is, it needs the following properties:Corrosion resistance, UV resistance, lightweight, and heat resistance although this is not essential as I could use a heat shield, I believe mica would be ideal for this. So...

I am pursuing my Bsc in Physics. I am still in sophomore year. This semester and next year I am intending to take some applied physics courses as electives. I got choices for Junior level electives, which are: -Optics: covers geometrical optics, interference, diffraction etc. -Fiber...

Hi, I'm a new member here so I'm not sure if I'm right in posting this query here. I was wondering if anyone could tell me why a CNC lathe is capable of higher material removal rates than a conventional lathe and also why it's work holding allows it to machine at higher revs/min's? Any...

this is a prof from lamar uni: i found his notes very use full(nits called pauls notes) http://tutorial.math.lamar.edu/download.aspx pls move to apporiate place ty BA

I am trying to define the stress strain relationship for a viscoelastic material. For a Maxwell model, I have the relationship in 1D as dE/dt = T / viscosity + (dT/dt)/ elastic_modulus. Where E is the strain and T is stress - t is time. But in a reference, (Neutrophil transit times through...