Copper Definition and 513 Threads

Homework Statement I[/B] I am trying to find an equation that relates the velocity of 3 magnet when it falls down a copper tube to my measurement. The length of the copper tube is L=0.24m, The total mass of the 3 magnet is m = 4.98x10-3kg magnetic flux density B = 428mT, the thickness of the...

Will copper behave as a dielectric in high frequencies?...I tried to answer the question with loss tangent but relative permittivity of copper posed a problem...everyone on internet opines differently about relative permittivity of metals...then I looked at skin depth which decreases with...

Dear Guys, It will be really helpful if some one can give me the calculation step by step or some calculator where in I can resolve my long pending problem. Thanks in advance I will be really glad to have a correct answer. The Q is below Calculate temperature rise in 3 core cable after 3 hrs...

For research purposes, what would be the result of Electrical flow or magnetic strength if an Insulated copper Coil were wound around a pice of copper pipe?

Why is it that nitric acid won't react with copper oxide, but it will react with copper?

Homework Statement A conduction electron moves through a block of Cu until it reaches the surface. At the surface the electron feels a strong force exerted by the nonuniform charge distribution in that region. This force tends to attract the electron back into the metal which is what causes the...

Homework Statement What is the diameter of a copper sphere that has the same mass as a 9.00 cm× 9.00 cm× 9.00 cm cube of aluminum? Density of Aluminum = P(al) = 2.70g/cm3 Density of Copper = P(cu) = 8.96 g/cm3 Volume of Aluminum Cube = Vcube = 729 cm3 Homework Equations Volume of a Sphere =...

Dear PF Forum, I think I have asked too many question for one day. I'm trying to understand antioxidant and free radicals. But, first I'd like to understand oxidation number. The oxidation number for hydrogen is +1 or -1. I can understand that. Either Hydrogen must lost one electron or gains one...

Check out the following video of a magnet falling through a copper pipe. http://www.sciencealert.com/watch-what-happens-when-a-magnet-is-dropped-through-a-copper-pipe

what I'm doing. I'm trying to install copper-nickle brake lines but I'm trying to figure out what fitting to use. options are brass, steel, or stainless(which would fluctuate between active and passive given road salts, etc). I'm joining with aluminium and carbon steel and obviously...

ok so I was creating a connection today and used a 5 v led on a 1.5 v battery. Battery was in a case from radioshack and had insulated leads, full of twisted micro wire. Since there was no way to crimp it or strip the wire without me ruining the twists, I just bundled it to some non twisted wire...

Homework Statement A sample contains 2.5x1020 formula units of CuSO4•5H2O... a) calculate the number of moles present in this sample b) calculate the mass of this sample N=2.5x1020 M=249.69g/mol 2. Homework Equations n=N/Na m=nM The Attempt at a Solution a) n=N/Na n=2.5x1020/6.02x1023...

I'm a computer scientist who was recently given a book about quantum physics. I am confused about something in the book. Imagine shining an x-ray (produced by copper K alpha 1 emission) on an aluminium foil. I understand the basics of photoelectric effect. You shine the x-ray on target aluminium...

Homework Statement In the circuit shown, two thick copper wires connect a 1.5 V battery to a Nichrome wire. Each copper wire has radius R = 0.009m and is L = 0.17m long. Copper has 8.4 \times 10^{28} mobile electrons/m^3 and an electron mobility of 4.4 \times 10^{-3}(m/s)/(V/m). The Nichrome...

For a high school school project I'm trying to build a device that will separate ions dissolved in water. I'm pumping water trough a box that has copper plates in it, and I'm putting that in a magnetic field. Because of Lorentz force the ions should bend off to different sides and heap up...

I recently bought a 1-pound .999 fine copper bar. I was curious to know how closely the density of my bar was with the actual density of copper (about 8.96 g/cc). My bar measured 1 pound .5 oz (467.76 g). I calculated the volume two ways, water displacement and measurement; the volume is...

Hi all, Here's my first post with a question I've been trying to solve for a while. I work with electronic components of very high quality and we try to make all our connections using thin copper ribbons of various thickness. I have started cleaning my copper connections with a solution of...

Copper with atomic number 29 is diamagnetic in nature. What is the reason behind it?

Hi there, I would like to know what PF's thoughts are on copper bracelets for the treatment of arthritic pain?

Homework Statement Your friend prefers to use a glass kettle with a copper base. You notice that the water takes less time to boil when using this kettle compare to the stainless steel one. Explain the phenomenon behind this observation. Homework EquationsThe Attempt at a Solution 1. Heat is...

Hello. I'm looking for literature or explicit formula about calculation of copper clad stub (impedance adapter) with a shape of rectangular triangle for use at output of an helix antenna.

Hey All, I'm trying to design a solenoid that would generate about minimum 1.6 A of current in order for me to charge up a 1.5 A 1.5 V battery. I already designed one which is about 10CM in length and unknown number of turns (as I used a drill to wind the coils around it. so I would guess its...

So say I have a tank of water of about 2000mls which is at around 80 degrees celsius and is pumped around a copper system which is 3/8th inch thick pipe. how many meters would the water have to travel through copper pipe to return to ambient room temperature of about 20 degrees celsius. any help...

Hello all, In interested making a wood preservative using diesel fuel, paraffin plus an algaeicide. I am wondering if Copper Sulfate Pentahydrarte will dissolve in diesel fuel? If not are there other copper chemicals that may? thanks in advance, HarryA

Hi, I am currently doing my final year project in college. I am using a copper pipe which is 8m long with 8.5mm ID and 10mm OD. The pipe is bent into a coil which will be placed inside a acrylic box. The aim is to pump water through the coil to get the box to a desired temperature. At the...

Homework Statement This was a problem I had on a stat mech exam awhile ago and I never figured out how to answer it. It asked "True or false, the specific heat of copper at room temperature is approximately ##3R##". Homework Equations $$C=\frac{Q}{\Delta T}$$ The Attempt at a Solution...

Homework Statement It is known that the theoretical resistivity of copper is approximately: 2*10^-8 Ωm. But after I conducted an experiment to find the resistivity of copper, the results turned out to be: 1.68*10^-8Ωm. This is a very small error that can be easily dismissed due to "human...

I'm not sure if corrosion does have a significant effect on copper in general but if it does, how and why does it happen, and the process of it happening and its effect on the overall resistivity? This is for a physics assignment...Please help if you can. Thank you

Copper ::: 60.7 x 106 S m^-1 Silver :::62.9 x 106 S m^-1 Gold :: 48.8 x 106 S m^-1 Why is the electrical Conductivity of these elements this way? I mean down the periodic table it should increase in case of GOLD but instead Gold is have far less value of Electrical Conductivity.

Ok, first off I need to explain my project first. I have a wood pellet stove that I want to use to heat hot water for a radiant heating system. I will have to do a custom job because nobody makes a kit for my particular stove. My question is howong of a colper tube is needed to heat the well...

Homework Statement Homework Equations Please see below. The Attempt at a Solution From my thread in the Solid State section (and input from DrDu): The Thomas-Fermi wavevector relates to the damping of an electric field caused by build up of carriers around an impurity (screening). Where...

I am interested in creating phosphors for electroluminescent panels and from what I've read, one of the most common compounds is copper-doped zinc sulfide (ZnS:Cu). I've figured out how to create the zinc sulfide through a simple combustion synthesis reaction but it is the doping part that I...

What limits the speed of information through a copper wire? What is the speed of signal in optic fibres? Is it faster and why?

so this is the question I'm having a little trouble with: Assume that the ratio of copper resistivity at room and absolute zero temperatures (so called "residual resistance ratio") is 1000. Estimate the electron mean free path in copper at low temperatures. we also know this: Let us assume...

Why does copper have a higher melting point than aluminium? Why does the melting point increase as you go down groups anyway? Aluminium has higher charge (+3) and a smaller radius, meaning that there is a higher charge density and thus stronger forces of attraction to the lattice. While copper...

I am making an inductor coil out of wire that I removed from a piece of insulated copper wire. The inductor didn't conduct and I checked the conductivity of the coil alone via a multimeter and it didn't conduct any electricity and it is a copper wire so I need to know what is going on here...

Homework Statement Calculate the buoyant force on a solid object made of copper and having a volume of 0.2 m^3 if it is submerged in water. Homework Equations B = pVg The Attempt at a Solution I followed the above equation and did B = (8.92 x 10^3 kg/m^3)(0.2 m^3)(9.8 m/s^2) B = 1.74 x 10^4...

Hello- I am running a simulation of a simple brazed copper assembly; brazed at 1050°C. I believe the Young's Modulus will drastically change after brazing at this temperature since the annealed state is "dead soft". My analyst colleague is using an annealed value for E of 15E-6 psi, which...

How does passing mercury, salt water, etc thought a copper tube create electricity? and dose it create a magnetic field?

Hello, Im thinking of using a copper heat exchanger to heat small room. Is there a temperature where bare copper starts giving off anything evil? Thanks, yarbl

If I made an electroyte with water and sodium bicarbonate and then electrolised it with copper electrodes would it produce copper carbonate on one of the electrodes?

Hello everyone from the Physics Forums, I'm doing a school project and I'm looking for a potential anode alloy that is ferromagnetic which I could use with a copper cathode. I'm making a battery and I have to use copper as my cathode mainly because I have made the cathode cells structured...

Dear all I have 250g of Copper 250g of Tin and 250g of Sulfur. Everything is in powdered form. Heated up in closed container wit surrounding nitrogen flow to avoid contact with Oxygen. Heating ramp is 3 hours to 1000K. What reaction will be the leading reaction? How to calculate how fast will...

I like the new software... the email feed was a good idea, and it coincided with an interesting problem I've come up with, that I thought I'd share: A copper pipe: 14mm OD, 12mm ID, 45mm in length, with a 2mm thick x 18mm OD shoulder. The type that comes with a nut, for connecting to the...

Homework Statement A solid copper cylinder, 50 mm long and of 10 mm radius, is suspended in a vacuum calorimeter. Wound on the cylinder is a length of fine copper wire which is used as heater and resistance thermometer. Initially the resistance of the heater is 100.2 Ω. A current of 100 mA is...

Hi all, I'm looking to electroplate a copper layer on top of anodized aluminum. Type II (sulfuric acid) was used to anodize the aluminum, and everything looks pretty good so far. However, I saw somewhere on the internet that one can electroplate a copper layer on top of anodized aluminum; how...

Homework Statement Here is the issue I met.Could you refer to attached file? 1.We glued one piece aluminum block and one piece copper tungsten block on substrate. The aluminum and copper tungsten block have different height.The glue thickness underneath them is different...

does sodium bicarbonate react with copper hydroxide in water ? what is the equation?

Homework Statement Many hot-water heating systems have a reservoir tank connected directly to the pipeline, so as to allow for expansion when the water becomes hot. The heating system of a house has 63.1 m of copper pipe whose inside radius is 7.69 x 10^-3 m. When the water and pipe are heated...

I know that graphene is a far more superb conductor than copper, but I'm trying to compare their weight difference. I mean, let's take an example: A copper busbar that is 7kg with resistance of 2 micro-Ω can carry a lot of current(in kA), I assume a much lighter(possible less than a kg) graphene...