Metal Definition and 999 Threads

Take one of a pair of metal cones and put a coax cable sized hole in the center of that cone. Let the "tops" of the cones face each other separated a distance a fraction of the diameter of the metal cones. Take a coax cable and connect it to the hole of the one cone (from the "inside" of the...

Hello, I would like some help on a homework problem. I would think that capacitance would simply be the positive charge's value in C divided by the deltaV value then multiplied by 10^-12 for pF conversion. Does this look like the right approach?

Hi everyone, So I have a bunch of snow that I am trying to find the fastest way to melt (and get rid of the water). I tried using a clothes iron and it seemed to work at first until the depth got too much (it worked well until perhaps about 2 inches of depth). I think the iron's plate got too...

Hello mech Engineers. To begin with, let me admit, I am not a mech engineer. But I am doing a project at home where I am stuck (I thought I will get through easily). To keep things simple, I will not deep dive into what the project was but the core problem. Consider that I have two rigid metal...

Dear all, I am interested to know if there is any spring available which is just a rectangular block - Looks more like a mechanical key. Preferrably made of metal. The dimensions / numbers shown in the following image are indicative: Pl. let me know if you have come across some applications...

[FONT=Calibri]I want to do a straight metal cutting, leaving a not too wide line whole in the middle (the filled white part) as seen in the picture. Does anyone know which tool would do this best?

A marvelous book from Academic Press covering current injection at metal and semiconductor interfaces, current flow, and space charge effects. Copies in good condition are selling online for $100 - $300. The dustcover is chipped but it has done its job to protect the cloth book covers. The...

Hi, I want to cover this piece of metal (A) with a plastic cover (white line B) that fits but I am not sure how that is created...do I need 3D printing?Has to be like an encapsulating plastic box that fits, hiding the underlying metal thing seen in the picture A...so the results is a smooth...

Transform my handy-wavy explanation of why group I/II metals oxides in aqueous solution are basic into a rigorous argument I heard an explanation about something being a better proton acceptor or lone pair donor but that doesn't make sense. I couldn't explain in in terms of acid-base theory...

Hello, I would like to calculate the "weight" of a piece of metal. It seems a little confusing that weight is measured in Newtons or force. So I'm looking for a little help in understanding. if I consider a piece of average aluminum. Dimensions: Length: 60.96 mm Height: 60.96 mm Thickness...

Thinking about filling sequence 5s -> 4d or 6s -> 4f, the n=4 orbitals are way smaller than n=5 or 6. Does this mean "localized"? Even though the n=4 orbitals are way smaller, close to nucleus, these orbitals have more energy than n=5, 6 orbitals above. What makes it less reactive?

Imagine you have two metal rods that are perfectly parrel and separated in by a small distance. One is at ground potential. The other is connected on each end to ideal supplies. The supplies can deliver any voltage waveform you need no matter the current. You desire to change the location that...

Hi, there! I am studying magnetism right now and I can’t understand how does a magnet work. I read that the magnet has a magnet field, which influences only charged particles with velocity. But then how does magnet attracts metal objects, e.g iron nail? I read that in metals there are free...

I'm trying to model a metal detector for my internship project. The system consist of one coil energised with an oscillator to create a magnetic field. The principle of the detection is by measuring the change in the coil impedance. with biot et savart law the magnetic field create by the...

Hi, I am trying to find a way to attach the clamp to the metal bar seen in the picture so that they become a rigid unit. I am not sure what is best way to do it. Drilling somehow? screws where? if anyone has a suggestion, please let me know. The metal bar in black seen in the picture is...

Metal is normally opaque in the visible range of the spectrum, so that makes it a good "barrier" to photons in that range. But if a film of metal is made thin enough then it is semi-transparent. Is this an example of tunneling or is it based on some other principle? Does the attenuation as a...

1961 My father worked for a well drilling company called, Schlumberger in Lansing MI. One day he told me the company has a radioactive piece of metal that glows white hot all the time we keep it in a cement box in the ground inside a metal box with a lid. Sunday Schlumberger was closed and no...

Consider a metal sphere connected to one end of the battery and the other end of the battery to be connected to the ground. Does the metal sphere become electrically charged with this method?

Ok, let's compare two cubes of lead. First lead cube weigh 6078 grams and its area is 3376 cm. The second lead cube is smaller and lighter at 5216 grams and 2713 cm area. The density of the first lead cube which is the bigger and heavier lead (by dividing its weight with the area) is 1.800 g/cm2...

I just tried cleaning our new oven with the pyrolytic function. Incredible results and it certainly warmed up the house. But the intructions insisted that I remove all metal racks etc. I have to wonder why, bearing in mind that the temperature can't melt the stainless steel. This increases the...

I would like to build what is usually used for heat production and is called a solar cooker. However, I would like to use it to try to levitate a piece of metal. Here are my assumptions: A. aluminum density = 2.7 g / cm^3 B. Sunlight intensity on Earth's surface is about 1000 W / m^2 C...

In the low temperature limit ##\mu \approx E_F## and the Fermi-Dirac distribution is ##n(E) \approx g(E)/(e^{\beta(E-E_F)}+1)##. An escaping electron contributes ##\Delta j_z = -ev_z = -ep_z/m## to the current density. How can I calculate the rate that electrons escape at? I can't see how to...

I am struggling with how to go about this; in particular, I'm not sure I understand what state is being alluded to when Ballentine says "For an electron that approaches the surface from the interior, with momentum ##\hbar k## in the positive ##x## direction, calculate the probability that it...

What'd be practical method and/or portable, simple tool (like sort of electricians' multimeter) to meter the heat conductive constant of a metal?

The situation is as follows. We have two disk magnets. One is fixed on the ground, table, or surface and has the north pole facing up. Then we have a metal plate fixed on the vertical axis rod or something similar such that it can't move up or down, but only rotate horizontally with as less...

i have a plastic handle and want to join it with a metal body. i can join it with heat stacking method i have find a product who done done that. is there any other way to join permenently?

Consider an LC circuit consisting of a parallel plate capacitor and a solenoid inductor in series. The formula for the resonant frequency of this circuit is 1/√(LC) where “L” is the inductance of the solenoid and “C” is the capacitance of the capacitor. Now consider a high-frequency cavity...

the steel glass is stuck diagonally inside the press cooker, getting it out by brute foce didn't work and neither are we able to rotate it. Washing it with soapy liquid didn't work either. Any ideas on how I can get the glass out?

Because of the plate P, the capacitor becomes a piece of conductor. It contains zero net charge and has 0 potential difference. Hence, the capacitance is ## \frac 0 0 # # that is undefined. The capacitance of a capacitor is defined as its capacity to store charge when a potential difference is...

For this problem, The solution is, However, dose anybody please know why the graphs for ##V_1## and ##V_2## are discontinuous where they cross the time axis? Many thanks!

Previously solved thermal energy gained by water as Eth= 0.15(4180)(17.6) = 11035.2 J Not sure if its relevant

Canada here. I've been in software dev for 20 years (and have been doing data entry in healthcare for the last four years, but it's only temporary.) Every time I consider a new career, I end up in software dev. I'm considering going against the grain of what I know and pushing my envelope. I'm...

This object, about the size of a tennis ball was found by my brother. It's metal. It's very hard. Cannot scratch it with a Stanley knife. Cannot break even a small piece off using pliers. Thrown with force at concrete and undamaged. Relatively heavy. My brother estimates similar weight to lead...

Hello all! I have a earring project with magnets involved but no magnet expert involved :( Here are a few stupid questions I hope someone can help us with! BACKGROUND: We are designing magnetic earrings. The earrings are meant to clamp the ear with 3 different levels of pressure. The magnetic...

a. We know metals emit EM radiation upon heating or electric current. I'd like to understand more fundamentally how this phenomenon takes place, on the basis of the basis of band structure, and which electrons are involved ? b. Classically, charges emit radiation when accelarating or...

Whenever I touch to a doorknob or any other metallic object I get electrically shocked. Does this occur because of temperature difference between me and the metal? Is it similar to seebeck effect?

Suppose there's some slow burning pyrotechnic mixture like KNO##_3## with powdered charcoal, and several really thin threads/wires of magnesium metal (or zirconium or magnesium/aluminum alloy) are made go through a pile of that mixture. Now I would guess that because a mixture of finely powdered...

A piece of metal moving West to East in a North to South fixed magnetic field slows down...but how? Yes of course eddy currents are set up in the metal and these currents generate their own magnetic field which somehow slows down the moving metal piece...but how does this actually slow the...

This is the color of the metal bucket when it's not hot. But whenever it is hot, the red changes to dark, and then back to red again when it is not hot. See the following youtube where I just threw the fake money at the bucket (see background below). Can you explain how the phenomenon work...

Does anyone on here have a 3D printer for metal? I'm looking to get a custom made socket wrench fabricated for 10 mm bolts or nuts. I'm looking for one that is extremely low profile. I don't care about the drive style (1/4", 1/2", 3/4", 1", external hex etc). The smallest mass produced one I...

Given a gauge 25 (0.02" or 0.5mm) metal roof roll formed made from hot-dip galvanized cold rolled mild steel. How long can these thin metal roof melt in a typical house or office fire with typical fire load? I read conflicting information. Some roof contractor said these thin gauge 25 metal...

It is mentioned in the book "Ampere-Neumann Electrodynamics of Metals", Peter Graneau, that Carl Hering in 1923 operated furnaces by passing high current through the molten metal pool. He observed molten metal flow due to the currents. How is the conductor motion explained?

I'm trying to build a DIY metal leaf or pith ball electroscope. I want to provide it with a circular arc voltage scale visible directly behind the (deflected) ends of the leaves. To calibrate the scale with ballpark accuracy, I want to determine the charge density upon the leaf pair (or pith...

Hi everyone, Any alternatives you know for metal spring? The idea is to find a replacement for a metal spring that has the same efficiency in bouncing an object that's hung by the spring. Any input of a kind would be valuable. TIA

Is there a metal that can never rust? I am tired of cars rusting even with antirust treatments.

hello my friends, the other day I read that the barrels of firearms before 1930 (the birth of gundrills) the barrels were forged from plates until they became a tube and later, they were made from steel bars that were drilled with welded HSS drill bits. Does anyone have experience with the deep...

What is the electrical resistivity of Caesium vapor? What is the electrical resistivity of Potassium vapor? Sorry there are no support material or reference links for this. Just a question. The unit must be in Ohm-meter.

I am in the need of airtight materials. Naturally, metal came to my mind. Metal is used in jar tops to create “airtight” seals. However, as I contemplated how the tops must expand slightly as they are screwed down towards the glass part of the jars, I wondered if this expansion compromises...

Hi all, This may be simple chemistry, but I haven’t engaged this topic for a very long time. I have an experiment where I need to measure the masses of some elemental (99%pure) metal cubes and I also want to know how many atoms of each element there are within them. From memory, Avogadro’s...

Note: for some reason frequency on this lecture is indicated by \omega. I wanted to calculate the reflectance using one of these equations that were given to us during the lecture: R=1 where \omega < \omega_p...