Copper Definition and 513 Threads

Summary: Relativistic effects on the quantum states of electrons in Copper and Gold Hello. I am a new member. I have read that the explanation for the colors of copper(red) and gold(yellow) compared to other metals being silver or grey in color is due to relativistic effects on the valence...

Would using mercury to form amalgam alloys combining gold, copper, and silver have any electronic value? Has this amalgam ever been made and tested in conductivity and Malleability? Or would it just be an expensive filling?

I am attaching a standard 5/8" garden hose with approximately 70psi pressure to a copper pipe that is capped on the opposite end with mist nozzles mounted periodically along its length. I want the pressure at each mister to be as similar as possible. The hose attaches at the base, a solid line...

Hello, I'm Andrew and I'm in 12th grade. If you are interested, I would like to share a presentation showing the process, observations, results of an experiment showing the physical effects copper sulfate can have on early plant development. I, with much help from some intelligent members of...

Hi All, Really struggling to get my head around what I'm doing wrong - every time my answer of wire diameter comes out too small for what's included in the table of SWG. I must be doing something wrong somewhere - my attempt is below. Any help is very much appreciated.

If a copper water pipe is connected to a piece of aluminum through a copper wire, where will the galvanic corrosion take place? On the wire to aluminum joint eating away at the aluminum, or will the whole water pipe suffer? (does copper corrode aluminum, or vice versa, or each other?) thanks

Hi, I'm in 12th grade and for my senior project I am doing an observation on the effects copper would have on plant growth. I have used copper sulfate to create increasing concentrations of copper in which I used to water my test plants. After further research of lately, I found that copper...

Hey guys I want to build electromagnet which can lift up to 3 kg from 26 gauge copper wire, 12V battery (bike), so how many turns should I do and what will be length and radius of the solenoid?

I have a set of little flywheels that have a magnet to break the motion of the system. I have one aluminum and several copper ones all water jet cut roughly to size. The copper and aluminum disks I have are all the same dimensions but bought from three different sources. Yesterday I machined the...

Hi, I'm in 12th grade and for my senior project I wanted to do an experiment on the effects that copper and zinc have on mung beans. I have copper sulfate pentahyde and zinc sulfate monohydrate, which I had purchased because I have seen information on other similar experiments where these were...

Homework Statement A point charge of 6 × 10−9 C is located at the origin. The magnitude magnitude at ##\langle 0.6,0,0\rangle## m is 150 N/C Next, a short, straight, thin copper wire 5 mm long is placed along the x axis with its center at location ##\langle 0.3,0,0 \rangle## m. What is the...

Good day all, I tried to solve the following exercise, I would be glad to get feedback for my attempt ( indeed I was puzzled by the numerical solution I got just need to check it for any mistake: A copper wire , 2mm in diameter and 100 m in length has an electrical resistance of 0,5 mΩ/m, the...

Homework Statement How much energy must be removed from the system to turn liquid copper of mass 1.5kg at 1083 degrees celsius to solid copper at 1000 degrees celsius? a. -2.49X10^5J b. -3.67X10^4J c. 2.25X10^3J d. 9.45X10^4J e. -2.78X10^3J Homework Equations Q=Mc(Tf-Ti)...

Homework Statement In the figures below, a copper wire of circular cross section, A, has been bent into a square loop of side length, c, and arc welded at the seam for electrical continuity. Assume that the resulting square loop has a resistance, R, and a mass, M. The loop is originally held...

Homework Statement Calculate the power needed to heat a 1360 gram chunk of ice in a 600 gram copper pan from 0 ◦C to the system’s final temperature of 35◦C in a time of 10 minutes. Homework Equations Q=mcchange in temp Q=mLf P= energy/time The Attempt at a Solution I thought that adding the...

I've just starting out doing some stained glass work which involves applying copper tape to the edges of glass then soft soldering the parts together. You can buy a Copper Patina solution that is intended to be brushed onto the solder to give it a nice shiny copper patina. However reports on...

do you think copper based grease on the threads of a hot dipped galvanized pipe would likely noticeably(naked eye, no measuring equipment) speed up corrosion of the galvanized pipe in normal environments such as buried in typical soils, maybe slightly more corrosive locations than urban areas...

Homework Statement without posting all the lab data I am just wondering if this makes sense. I calculated moles Chlorine to moles Copper as 2:1. (seems reasonable to me). Then I calculated mole ratio of water to Copper in hydrated sample as 20:1. (not sure if this is "reasonable " or not...

Because metals have free electrons, so they have almost continuous energy states going up and down different energy levels and repeating themselves, most metals are silver-white, right?But why do gold, copper, and cesium have special colors? I wanted to know more about this, so I studied the...

Homework Statement A copper wire and an iron wire of equal length l and diameter d are joined, and a potential difference V is applied between the ends of the composite wire. Calculate the potential difference (in volts) across the iron wire. Assume that l = 2.00 m., d = 0.30 mm., and V = 156...

I have obtained an experimental setup of a Marx bank which has electrolytic liquid resistors. In the tubing of the resistors are various strength solutions of copper sulfate. I was told that the electrodes are copper but there appears to be some sort of plating or other reaction occurring...

Copper pennies were placed into HCl which had been diluted with an unknown quantity of water. The pennies look cleaner, ... remain un-corroded (as expected). There is a slight bit of gas being produced , with no smell, but can cause discomfort to eyes. Bubbles formed on the pennies for the...

I put some copper bits into concentrated sulfuric acid. Nothing much happened other than it got shiny and clean looking. So I poured off the acid and then put water on the copper to rinse off the remaining acid, and the copper started bubbling and made a nasty rotten egg smell. Is that...

Hi, I've seen many videos of neodymium magnets sliding slowly down an inclined copper plate, or slowly down a copper tube - due to eddy current braking,but never the other way around. My question is; will a copper disc sliding down an inclined magnetic plate, or down a magnetic tube act in the...

The reaction below moves left to right (I expect it has an equilibrium somewhere): SO2(g) + 2 CuCl2(aq) + 2 H2O → H2SO4(l) + 2 HCl(l) + 2 CuCl(aq) I'm wondering if copper (II) acetate will work in place of copper (II) chloride: producing acetic and sulfuric acids instead of hydrochloric and...

<< Mentor Note -- thread moved from the technical forums, so no Homework Template is shown >> The situation is as follows: Current I flows along the axis of the copper pipe. From Ampere's law, the magnetic field inside the pipe is zero and is equal to μ0*I/(2π*r) outside the pipe. Now, an...

Hey everyone, I'm hoping that you guys will be able to help me with some calculations. I was on YouTube and came across this: I then began to wonder if I could make a solenoid using bitter disk as in the video, granted no where near as powerful. I would say 1 tesla using an iron core. After...

I have read that, while copper is not magnetic per se, if we have a strong enough magnet, it can interact with copper. This ties in with the fact that all matter can be magnetic if you have a strong enough magnetic field. But I am interested, how strong must the magnet be to interact with such...

I'm working on some decorative items made of copper. I'd like to have them achieve the brown color of an old copper penny (or the old copper pipes in my home). I've read you can do this with some chemicals, but due to size/shape I'd like to do this some other way. I'm also concerned that any...

Could calcium and copper and say - boron, be joined into one substance? If not boron, then which element? I am trying to design an alien skeleton with copper, calcium, and ? I love copper and part of the idea is its distribution throughout the universe. I am asking for a tip about where to look...

Question#1 I would like to compare a 100' length of 4" PVC pipe with air in it surrounded by Earth and/or water. What length of 4" copper pipe would equal a 100' length of PVC? Question#2 If the inside of the pipe had turbulence what length of non-turbulent 100' PVC 4" pipe would it equal? I...

So I was playing with periodic table and discovered Cu's 29th ionization energy(cu with no electron) is 1116105 KJ/mole . Then i searched on google to convert to MeV which is 6.9661798e+21 , then I thought that one uranium 235 produce 200mev so to make that you would need around 3.5e+19...

Hello, I have a question for expert in termodynamics. Let's assume I have a copper conductor made of two big disks connected with a very thin wire. Let's imagine I have a current pulse starting somewhere in the wire, and assume the current density is high, like 100A/mm^2. This current will...

I'm trying to build a fanless computer case for a small electronic device. I'm trying to figure out what type of heat-sink material I should use. I have a solid copper rod about 3cm in length with a radius of .05cm. I've determined and calculated the density, specific heat, thermal...

I have a 2 AMP regulated DC power supply, with variable voltage 3 - 12 v. If in a small circuit, i.e, small copper wire with 1 ohm resistor. Why am i not getting at max Amps?

I'm an amateur chemist, and due to some of my projects I have what I would consider an excess of copper powder. I'm just looking for some interesting or fun things to do with the copper. Note: I do not have access to a furnace.

Homework Statement If the magnitude of the drift velocity of free electrons in a copper wire is 7.84×10-4 m/s, what is the electric field in the conductor? (Also gives chart that states that the resistivity of Cu is 1.7×10-8 Ωm) Homework Equations [/B] vd=(qEτ)/me (where τ is avg. time...

Homework Statement ABCD is a plane rectangular strip of conducting material of uniform thickness, with a steady current flowing uniformly from AD to BC. The potential difference between E and F, the mid-points respectively of AB and CD, is zero, but when a magnetic field is set up at right...

Hello all I'm trying to calculate a torque needed to tighten a threaded terminal. (Both male and female parts are copper alloy) I'm using Motosh's equation which requires me to use the coefficient of friction. Web sources tells me that the copper-copper coefficient of friction is 1.0. The...

Hello, I have seen a video online that shows how a LED can be lit using a single lemon without using a copper and a zinc nail. They simply stick the LED into the lemon. What does that work? I know the lemon contains the electrolyte but don't we always need to dissimilar metals for the battery...

I want to copper plate a non metallic material I will be using genuine silver paint to coat the material, my problem is how to estimate the time it takes to deposit a layer 25 thou thick. I have a variable voltage, amperage power supply, i guess it has some thing to do with varying the amperage...

Hi there everyone, I'm doing some study on electronics and the section on the advantages of A/C over DC mentioned that AC has less copper loss (I^2 x R), But to me this seems contradictory to the skin effect. Could someone please tell me why AC has less copper loss.

Hello everybody, this is probably a very novice question, but imagine anode and cathode, both made from copper immersed in CuSO4 aqueous solution (1M at standard temp and pressure + assuming electrodes are very near each other -> minimizing diffusion/migration resistance) and: Cu(2+) + 2e- ->...

Hi, I have a question concerning the use of aluminium in power lines. I know that it's lighter than copper and thus cheaper, which is the main reason we prefer it above copper. But in fact alumunium has a lower conductivity than copper. Why is it then that one kg of aluminium can carry twice...

Morning all, I am currently designing a VAWT and am working on a contra-rotating turbine, but I am extremely new to electrical engineering as a whole, I just really like the idea of designing something like this as a fun project and possibly being able to benefit from lower power bills as a...

[Note: Thread moved to homework forum by mentor] This is one of my homework problems: You are designing a counter flow heat exchanger for cooling a KOH electrolyte pH (11) in an electrolysis unit. The liquid is saturated with hydrogen. One of your team members suggests using copper pipes for...

I have approximately 30 pounds of discarded phone wire. I would like to recycle the metals (copper?) within, but don't know if it is feasible or even worth attempting. I also just returned from helping a parent clean out the garage, including a retired aerospace engineer's vast collection of...

Homework Statement Copper and aluminum are being considered for a high‐voltage transmission line that must carry a current of 51.4 A. The resistance per unit length is to be 0.176 Ω/km. Compute the magnitude of the current density for an aluminum cable. Homework Equations R\quad =\quad \frac {...

Hello everyone, We are trying to fabricate a copper layer that is 41% reflective to a beam of 1521nm wavelength. The formula I have used to calculate the thickness is: R = 1 - e-αt Where R: desired reflectance of mirror t: thickness of mirror that would produce said reflectance α...

If you drop a permanent magnet like steel through a copper tube it induces an emf, this is because you have a change in magnetic field/flux? But how? Why? The copper isn't producing a current before the magnet is dropped into it... Does something happen with the electrons in the copper?