Metal Definition and 999 Threads

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?

<<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...

Homework Statement Two identical uniform metal spheres of radius 47 cm are in free space with their centers exactly 1 meter apart. Each has a mass of 5000 kg. Without integrating, show that gravity will cause them to collide in less than 425 seconds. [/B] Source: Classical Mechanics, R...

hello every one can you help me in selecting the material to be used in the blade of cutting machine which will be used to cut galvanized sheet metal

hi every one can in you help me in finding the required force to cut sheet metal electrically as shown blew

I placed a hot metal lid on a cool surface. When i tried to pull it up, it had a lot of resistance, i had to really try to pull it up. I could hear sounds under the lid, I'm guessing it was boiling water. What do you think could have caused this resistance?

As one know, the force on mangnetic dipole in magnetic field is $$ \vec F = (\vec p_m\cdot \nabla) \vec B_0$$, where B_0 -- external field. Let consider a some magnetic matherial with permeability \mu. The magnetization of matherial is $$M = (\mu - 1) H$$ (in SI units) and by deffinition $$M =...

Physicists Create Quantum Electronic Material Known As 'Kagome Metal' https://interestingengineering.com/physicists-create-quantum-electronic-material-known-as-kagome-metal

I need to bounce some ideas off you for my project. My project is to build an exterior handrail, using these flanges: The actual inner diameter (ID) is 1.66" and the material is galvanized steel. I was supposed to use the appropriate pipe size for the handrail made also of galvanized...

Homework Statement fig 1 : Area of each plate is S, separated by 2d, charge Q in the capacitors fig 2 : uncharged conductors of area S, thickness d, inserted parallel between plates What is the ratio of electrostatic energy in fig 2 to electrostatic energy in fig 1? Homework Equations Q =...

<<Moved from a technical forum, no template>> Why the answer is A?

Hello Can ultrasound pass through metal? How much of it can pass and how thick the metal can be? I couldn't find anything online, I only found some contradicting and unclear information.

Hi, So I recently had to get an MRI. I forgot to take off my wedding ring, but the technicians said it's ok "if it's real gold". I told them it was white gold (which is an alloy of 58.5% gold and the rest is other metals). They said it was fine, but later told me they didn't really know what...

I'm doing some calculations on deforming of metal sheets. I have a formula for calculating the force needed to bend metal sheets. Does anyone have suggestions on where I can find more information? What I would like to end up with a way of calculating the force needed to deform metal sheets such...

What protocol should I use to get a good stable 100nm Au adhesion onto a Si substrate using electron beam evaporation? I've heard talk of primer layers of either Cr or Ti at around 5nm thickness, as the typical way to do it. Which material should I choose? What the advantages or disadvantages...

Homework Statement Homework EquationsThe Attempt at a Solution Potential at the center of conducting charged sphere surrounded by a grounded shell If I take another sphere of charge –q of radius a with uniform charge density, then the potential on the spherical region from the radius a to...

Since positive charge on the photocatode increases work function of electrons, does charging metal photocatode negatively decrease work function? If not, why?

Homework Statement Two large, flat metal plates are held parallel to each other and separated by a distance d.· They are connected together at their edge by a metal strip. A thirt plastic sheet carrying a surface charge \sigma per unit area is placed between the plates at a distance 1/3*d from...

Hi, I am researching maraging steel material used in additive manufacturing and there are references in the literature to a mesostructure. Can anyone clarify?

Hello.. (see 3 colored pictures below to illustrate the question) I have a pair of eyeglasses with screwless spring hinges that uses spring steel metal strip (see full pictures below). I’d like to understand something about it. When the temples are fully opened.. the spring metal strip are in...

Hi, If some voltage is traveling from a low conductivity metal to a high conductivity metal, does it impose limitations on the high conductivity metal such that it will only do as much as the low conductivity metal?

Homework Statement Homework EquationsThe Attempt at a Solution Since the dependence of resistance upon the tem. is different for metal and semi - conductor ( increase of tem. decreases semi - con. resistivity while increases metal's resistivity.), option c is not the right answer. Since...

Hello, I've been thinking about if amorphous metal (aka metallic glass) could created by using regular electroplating or if it has to be created by rapid cooling of the metal after molten. There is a method which a thin layer of metal powder is applied to a flat surface where a laser beam melts...

I am trying to understand the construction of CVT Metal belts that are made up of steel elements and some rings. I do not understand the full construction details of the belt. The most detailed information I have got ever is in this PDF on page 5...

Hello all First time on the Math side of this great Forum. I need to do a correlation study. There are 3 methods to measure Form Error of a round metal part. The base line is the traditional measuring method that is laborious but of the highest accuracy. A cnc machine measurement machine...

I'm working on a public area audio system where we need to install our horn speakers on big height as per their installation requirements. We designed a metal pole as described: Pole consists of two poles: 1) a 7.5 meters height, 10" diameter, 6mm thickness. 1.5 meters are to be buried...

Hello, I got this problem but I don't know How can Find Heat loss (or gain) - Q3 - from the curved surface of the metal rod to the surrounding. This is the problem: A metal rod, of diameter (d) and length (L), runs between two hot walls at temperatures, T1 (Wall 1) and T2 (Wall 2)...

Hi! I'm curious to know, whether it is possible to produce electricity by moving a piece of metal over a magnet (i.e a immobile magnet and a moving piece of metal close to the magnet), and how this would be done in practice.

HI, I have application where i need to lift metal plate, 3kg weight, ( 3mmX 15mm), 250degree.C hot, for the period of 1min and put it back. For lifting purpose i am using actuators. As i have no opportunity to make hole in plate i have to use magnet for lifting purpose. I got Electromagnet...

Homework Statement Homework EquationsThe Attempt at a Solution I solved the first part. I = 4πσV/(1/a - 1/b) Here, it is solved assuming that both the shells have positive charges and the charge flows from the inner shell to the outer shell . So, in the part c, it is assumed that each...

Okay, I have a very simple question that...Suppose we have a very wide cube(dense and hard)...We place two persons at each of its ends...One the persons strikes its surface at one end. Now this person A will hear the sound due to vibrations of that end's surface (which further vibrate the air...

Homework Statement Homework EquationsThe Attempt at a Solution For drum A, Eqn. of COM motion gives, ## T(\hat y ) + Mg (- \hat y ) = M a_A (\hat y ) ## ; ## a_A = - |a_A| ## eq (1) I need to know T here for getting ## a_A ##. For drum B, Eqn. of COM motion doesn't give...

Hello, I am a civil engineering student undertaking a project to investigate the effect of pipes and pipelines beneath the ground on the urban city environment above. In order to proceed I am designating a simple metal detector. Due to low depth capability of all commercial metal detectors mine...

Not only are lead nuclei heavier than gold ones (207 vs 200), but the atoms are smaller (ionic radius 119pm vs 137pm). There is every reason for Pb to be heavier. Why is it lighter? (11.34 vs 19.31 g/cm^3) They both have a FCC crystal structure, so the packing should be equally efficient...

Hi guys, I am trying to produce a desktop feature for a client which consists of a 3d printed cube with a metal ball at its center. I can suspend the ball in the center of the cube using a support or piece of rod, but I would really like to try and make it levitate using an electromagnet. I...

I have an 80 ft metal tower that is cemented into a dirt ground. It houses two small antennas to send and receive signals for wifi. This tower's power source is not a home. It has a dedicated line that runs directly to its own power meter. This tower is about 300 ft from a concrete home. The...

Homework Statement I want to build a musical instrument for homework . I want to cut triangular metal plate where triangle will stand vertical to ground , bottom of triangle is 1 inch wide and clamped , triangle height is 42 inches. Does that triangle produce different notes when hitting from...

Good morning everyone, new member. Have been reading some other posts for awhile. I am auto technician/business owner. I was wondering if I was to post some rudimentary plans for a rv cover I am going to build over a 2 post outdoor car lift, if some one would be willing to give me points on any...

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...

I haven't been able to find much information on the thermal decomposition of metal oxides into their corresponding metals and oxygen. What temperature would Fe3O4 decompose mostly(80%) into its base elements? Additionally, how can this information be determined based upon bond...

Homework Statement The susceptibility of a simple metal has a contribution ##\chi_{c.c}## from the conduction electrons and a contribution ##\chi_{ion}## from the diamagnetic response of the closed-shell core electrons. Taking the conduction electron susceptibility to be given by the free...

Which metal platings on glass will provide 100% reflection as a mirror? In which case we will get an brighter image than the actual one in mirror?And in which case it will be darker?Which metal(used for platings) will absorb a very little amount of ray? Can anyone give the explanation?

Homework Statement A punch is used for cutting an (approximately) circular hole with a diameter of 35 mm through a metal sheet 0.2 cm thick. If the shear strength of the metal is 80 MPa, estimate the force needed to punch the hole. Make it clear how you have calculated this value. Homework...

Homework Statement The figure shows a metal coil labored as A. Heading torwards a region where a uniform static magnet field exists, poiting torwards the ground (hence X). The coil moves with the same constant velocity. As it enter the magnet field the coil will have an induced current in it...

Homework Statement If a metal is adhered to a surface of another metal, let's say copper is plated onto aluminum, how can the elastic modulus of copper can be extracted given only the data of the thickness of the copper and aluminum, the young's modulus of the combined metal and the modulus of...

Hello Physics Forums! My problem is as follows. I have a device that produces heat via Nichrome coils. I want to heat another small piece of metal (in this case stainless steel) with those Nichrome coils. I need to reach 175 degrees C, and so far I haven't found a readily available thermal...

Arrange the energy released upon hydration of Magnesium Oxide,calcium oxide,barium oxide,strontium oxide. I placed Magnesium oxide at the last,since magnesium hydroxide is a stable so lot of energy must be released in order to achieve that state,but the answer says calcium oxide.

To elaborate more on my question: Is it possible to send metal balls through a pipe with magnets arranged a certain way which could hit a target with force. I've seen something similar done before but I think the ball was also a magnet, is that the only way possible?