Metal Definition and 999 Threads

Would a small (of order 5 microns to 0.5 mm) liquid metal droplet, if cooled slowly away from external perturbations and not in the presence of oxygen, retain its highly smooth and polished surface as it froze? What phenomena would influence the surface roughness? I assume that simple density...

A little background on my experiment … "Henna" (Lawsonia plant hair dye going way back to ancient times) used to be combined with metallic salts to cause it to adhere to the hair and make it thicker with cumulative use. In foreign countries "compound henna" is still being sold but often w/...

Why do high levels of radiation taste like metal?

So here's what's going on... I've gone and made an attempt at building a height adjustable table. Originally I was going to use stainless steel for the pipe, but after finding out that it would more than quadruple the price, I ended up with SCH40 Aluminum. I used three 48" long, 1" ID pipe...

Problem Statement: so we did an experiment. basically the teacher gave us each a cube of unknown metal and we had to figure out what it was using the specific heat. we put the metal in boiling water until it was 212C and then we put it in room temp water and we measured how much it heated the...

Hello Material experts out there ! I would like to test a reduced deposition rate for Ni ( 0.3 nm/sec reduced to 0.1 nm/sec) to avoid metal splashes and stabilize the process. This would for sure increase the deposition process time but I'm not quite sure of the Microscopic effects of such a...

https://www.sciencealert.com/new-24-7-ai-generated-death-metal-youtube-stream-is-giving-us-anxiety

I want to replicate the rocking semi-cylinder problem from analytic mechanics, but don't actually have in my possession a nice, solid cylinder to rock. I imagine my professor likely made his, or found it somewhere in Estonia. If anyone can point me to place where I might be able to find one for...

Recently I am learning about electrodynamic radiation and its various types, and it occur to me that since the form of the magnetic field created by the dipole radiation is some combination of cos(wt), 1/r, and cos(kr) (take the approximation of r >> c/w) Therefore, if there is a metal placed...

I need help with the problem above

Does the metal being attracted make a difference? How would you find the force on the metal knowing the field strength there? How would you even calculate the field strength of an electromagnet with a core? In my case, it is one of those junkyard electromagnets. thanks

Does anyone have any experience with creating a hermetic seal on metal housings that are sandwiching a thin metal membrane? Specifically with the fluid leak path between the metal and the plastic.

https://www.bbc.com/news/science-environment-47543875?linkId=64786577&fbclid=IwAR0XVhEgxDVz0nBi6l5DTXb_FeH8j3hHjMbI-o56y-nGTO8TIZvKbGyOlZY

Hey everyone this is my first thread i was wondering how you calculate the inductance of a solid sphere. Say a sphere for example of 5cm diameter with electrical contacts on opposing sides 0.5 cm in diameter. Any help would be much appreciated

I am working on a project to remove cutting oil from waste metal chips. I need to know the retationship between viscous force of oil and centrifugal force required to remove oil from chips, so that I can calculate the RPM P.S Design is attached

Homework Statement A circular metal plate of diameter D needs Q Joule of heat to expand and the temperature changes from 40oC to 58oC. What is the thermal energy needed to expand identical metal plate having twice the diameter for same increase in temperature? Homework Equations Q = mcΔT The...

Hi, it's been a long time since I've been on these forums, but here is a new 3D blender model that I spent four weeks of daily work to finish. I'm glad it's done, it wasn't easy. This is metal gear RAY, a 70-foot tall robot from the popular video game franchise metal gear solid.

Homework Statement Aluminum metal dissolves in hydrochloric acid. What volume, in mL, of 1.58 M HCl is needed to completely dissolve 3.200 g of aluminum?(Hint: write the single-replacement reaction first) Homework Equations V[1]M[1]=V[2]M[2] The Attempt at a Solution I got the...

Homework Statement [/B] What is the contribution of the conduction electrons in the molar entropy of a metal with electronic coefficient of specific heat? I can't figure out how to comprehend this, which relation/theory might lead to this? and How this answer is relevant to the point of molar...

Not sure if this is the right place to post, but I am wondering, can this VLF station melt metal (details below post)? I recently did a scuba dive with a company in exmouth, WA, who provided some info on this station. They had been told that the control room is made entirely of wood, and even...

When we make a metal sphere positively charged by electricity, why doesn't it react with oxygen or any other element in air as metal has positive charges and one of the element in air must react with sphere as I think an ion can never stand in air without reacting? If it reacts, why doesn't...

Hi everyone! Brand new here. I'm sorry if this isn't the right place to post this but I am terrible with math/calculating anything so I thought I would reach out and ask! No harm done, hopefully. I'm building an 8' x 3' x 2" live edge walnut slab table and am trying to create some steel legs...

Homework Statement A metal strip 6.5cm long, 0.88cm wide, and 0.76cm thick moves with constant velocity, magnitude v along positive y-axis, through a magnetic field, B=1.2mT along positive z-axis. A potential difference of 3.9x10^-6V is measured between points x1 and x2 (as shown in...

Metals are highly effective at screening electric fields. If we place two contacts reasonably far away from each other on a piece of metal and apply a voltage bias, the charge carriers in the section that is far enough from both the contacts should be unaffected by the electric field. Why then...

Homework Statement Do metal atoms, such as Ti and Na, have London-dispersion force?2. The attempt at a solution In the textbook by Tro (6th ed), "Since all atoms and molecules have electrons, they all have dispersion forces." But metal atoms are held together by electrostatic forces. I think...

Homework Statement The question is exactly the same as this question https://physics.stackexchange.com/questions/250297/metal-sphere-in-a-uniform-electric-field However, it says "Then by symmetry the entire xy plane is at potential zero" in the book. I don't understand this. Homework...

So, I'm considering the match up between Goku and, let's say, an armored mech. I wrote out rules for a GURPS game based on Dragon Ball flavor and powers but kind of a more logically consistent version of that universe that I have written probably a couple dozen pages about so far. So, the...

Hi everyone, I want to figure out exactly how clean a particular lab room is (in terms of trace metal contamination). I’ve read papers where people have simply left a vial of high conc. nitric acid on a hot plate to concentrate it, then measure contamination from lab air using an ICPMS. I...

This is only my second post and I pray it is deemed on topic. This forum has given me a lot of insight however a forum search left me without answer here. Most likely because you are all WELL above my knowledge level. I'll try to make this short and again pray I'm on topic.. I live in florida...

I am trying to gain a very basic understanding of voltage. I understand amps and resistance, but not voltage. I am thinking of a copper wire that is used in a basic electrical circuit to light a light bulb. Is the voltage of this wire an inherent property of copper at a given temperature...

Generally, a material is metal or insulator is simply determined by the gap. But if we view it in another way, to measure the resistance in different direction, says x and y, and there are usually different. And then measure the resistance change with temperature. Usually, the resistances goes...

Is the speed of sound different through the same piece of metal when it is heated compared to when at ambient temperature?

I'll get into the details why I need this for below but first I'll explain what I'm looking for. I basically need a flat sheet of aluminum or any plastic in grey or black color that doesn't provide specular reflections, yet is smooth enough to not have any noticeable texture when looking with...

Homework Statement I tried to understand the problem b) and c).[/B] Homework Equations Faraday's law: ∇xE = - ∂B/∂t emf ε = Bdv Force : F =ma, Lorenz's force F=q(vxB) ==> ma = IdB Power : power of battery = εI, mechanical power of the wire = Fv The Attempt at a Solution I think I solved...

Doing a research on the topic above, I want to determine the effect of volume fraction on the viscosity(or determine the viscosity) of the mixture in molten form, is this possible? How ? Thanks

Homework Statement What will be the complete equation if an oxide of a metal is MO? 3. The Attempt at a Solution M + O2 = MO or M2 + O2 = MO As far as I know, non-metals come as molecules such as O2, N2 etc But I am confused about metals. in the reactant, do metals react as a molecule or as...

i know that x-rays are produced when a beam of high energy electrons hits a metal anode but why does that work better than when that same beam hits glass (like in the Crookes tube)? Thanks

Homework Statement I am trying to solve a problem that I have invented. It consists of a metal stick of mass m, which falls by the action of gravity (g=constant) within a perpendicular constant magnetic field B. The direction of magnetic fiel is showed in the image. The stick makes electrical...

Hey there! I want to make a rosin press from scratch. I have a big press with 2 inch thick metal plates, probably about 4 inches wide and 10 inches long. I need to heat these plates up to 230 degrees Fahrenheit and press them against each other with product in between them. I am going to fasten...

In bolometers, incoming radiation warms a strip of material. this material will have a large thermal coefficient of resistance, leading to a (small) resistance change in the material. the inventor, Samuel Pierpoint Langley apparently used this to detect a cow from 1/4 of a mile away using a...

The photoelectric effect occurs when light causes electrons to fly off atoms. An equal number of electrons to protons gives an atom a net charge of 0. If I left a piece of metal in the sun for a long time, that would mean a large number of electrons would fly off. This should, in theory, give...

Homework Statement Moment of inertia of a metal plate (center at origin) which was a square before 1/4th of it was cut off (4th quadrant), about three points a)- top leftmost corner in 2nd quadrant b)- origin and c) (where the right-lowest corner used to be in 4th quadrant) ranked in decreasing...

Homework Statement Stretch forming[/B] A 38.1 cm-long sheet with a cross sectional area of 3.2258 cm2 is stretched with a force, F, until alpha = 0.35 rad. The tip of the force is fixed to the strip by some means, thus maintaining the lateral position of the force. (The left portion of the...

Homework Statement Homework EquationsThe Attempt at a Solution I have honestly no idea about this concept . Book doesn't mention anything about this . This looks similar to Faraday cage in electrostatics . But I don't understand how this works in case of magnetic fields . Is this related to...

Homework Statement Homework Equations The Attempt at a Solution The moment of inertia before collapse is for each rod: BEFORE COLLAPSE:[/B] Ib = ∫(L2 + x2) dm = m/L ∫(L2 + x2) dx = 4/3 * m * L2 We have 8 of these plus the inertia of the mechanism, giving a total I, It = 8 * Ib + Ik =...

are there any already existing devices on the market or possible ways in which one can make a liquid metal slip contact like a mercury contact in which the mercury can be held at a specific location within a confined space with the help of magnetic field? I know that mercury itself is very weak...

Let's say I have a bullet flying by a magnet, the magnet will attract the bullet and change its trajectory so it will turn slightly. Does that trajectory change take energy? If it does, where does it come from? The kinetic energy of the bullet?

Hello What is Metal and PML boundry condition in Comsol? How can i specify metals and insulators ?

<<moderator: moved from a technical forum, no template>> Hi ... I have a question about a job in the material science courseWe give the hall petch type that denotes the dependence of the strength on the average grain diameter d, also has a value close to 1mpa. I have to show in a diagram σ-d ^...

Homework Statement A metal cube is placed in an empty vessel. When water is filled in the vessel so that the cube is completely immersed in the water,the force on the bottom of the vessel in contact with the cube (A) will increase (B)will decrease (C)will remain same (D) will become zero...