Copper Definition and 513 Threads

If I have a sheet of copper, how can i calculate its resistance? do i just take the surface area of the thin side and compare it on an AWG chart?

Hello, say you have a cylindrical magnet magnetized through thickness (not radially) and you drop it through a copper tube. It will slow down. Is there an opposite force on the tube? If you were to hold the tube in your hand and drop the magnet inside, would the tube feel heavier?

Hello: I am having trouble starting this problem. "20.0 m long copper wire, 2.30 mm in diameter including insulation, is tightly wrapped in a single layer with adjacent coils touching, to form a solenoid of diameter 2.50 cm. What is the field at the center when the current in the wire is 26.0...

I'm really stuck on this one problem: "A small but measurable current of 4.20E-10 A exists in a copper wire whose diameter is 0.02 cm. Calculate the electron drift speed (in meters/second)." Source: Serway and Jewett I know that: I = 4.20E-10 A n = 8960 kg/m^3 q = 1.6E-19 C d = 2E-4...

I have a question. Assuming I have oil at 80 degrees in a copper calorimetry cup , will the heat loss by thermal radiation be very high and will it affect my values? I am thinking that it would not and that it would be negligible. But i do not know why. I heard somewhere that it would be...

Hey, this is a great 1 minute long video showing you how to make a homopolar motor using just one AA batter, a copper wire and a magnet. ENJOY! http://www.spikedhumor.com/articles/90173/Homopolar_Motor.html

Can someone please verify my results? and help me in one-2 questions? I did this lab in school today and had some problems filling in the table that followed. In the lab, we took some Copper Chloride and mixed it dionized water. Then we added in an iron nail and waited for about 20 mins. After...

Homework Statement 7.80 g of copper (II) sulfate pentahydrate (CuSO4*5H2O) were dissolved in a beaker of 50 mL of water and heated slowly. 2.00 g of iron filings were added to the solution, and then the mixture was allowed to cool. The supernate was decanted, and the contents of the beaker...

I put a copper pipe in a tank of water with dissolved iron in it and applied an electric current somthing like 6 volts at 1.5 amp and the pipe was hooked up to the positive terminal. After a couple of days some tourquise or pale green substance formed, i scraped this off and there was a copper...

in a recent chemistry experiment at school, two voltaic (galvanic) cells were set up with the same solutions in either beaker (one being Copper Sulfate, and the other was another metal solution) anyway, one had a potassium nitrate salt bridge, the other a copper wire salt bridge... sooooooooooo...

"Generation" of gold, silver, copper elements Since gold, and silver, and copper are all elements, I am a little confused - are they generated, or is there already only so much of each in the Earth, period? I know I found some data on Wikipedia that indicated that the various elements can be...

Okay, here is the problem: If the elastic limit of copper is 1.50E8 N/m2, determine the minimum diameter a copper wire can have under a load of 10.5 kg if its elastic limit is not to be exceeded. Obviously I am looking for d in this problem. I am given the downward force (102.9 N = ma); A =...

Hello, In a lab experiment, we filled 2 wells of a culture plate, one of them had 1.0 M CuSO4 and a piece of zinc metal, and the other well had 1.0 M ZnSO4 and a piece of copper metal. My question is: Which well has the reduced form of zinc and the oxidized form of copper? I know that...

G'day Forum, Struggling with the old materials science. Can someone please help me with the processes involved in modifying the properties of copper. I read that generally it doesn't respond to heat treatment.. is that true? Something bout cold working and hot working? what's the effect...

can YBCO be prepared in lab.?:biggrin: :approve:

1.What will be produced when Cu(II)SO4 is mixed with sodium carbonate 2.What will be produced when Cu(II)SO4 is reacted with sodium carbonate and sodium hygrogencarbonate? What causes the difference between 1 &2? Is the product for Qn2 CuCO3.Cu(OH)2aq?

Why is Copper Tetraamine Complex a square plane? Shouldn't it be tetrahedral since there is only four bond pairs?

Hi all, I know in copper mining industries copper which is at 99% pure ( Blister copper ) which is electropurified to 99.99% by simple electrochemical cell consist of copper sulfate as electrolyte bath along some sulfuric acid in it. My question is it possible to do this same process say...

Why does copper conduct heat better than aluminium and iron? Could anyone help me answering the question? Thanks.

For the past few weeks i have been trying to make copper chloride. I was successful in making it two different ways, but it turns out that the copper chloride that i get is in its 2nd oxidation state. And I am wondering if it was in it's first oxidation state would it not be so hydroscopic...

1.Why is a copper wire was used in a solenoid rather than a iron wire ?

Hello guys. I gave this one the good ol effort and seem to have gotten stuck. Can anyone help? ----------- A copper wire with a circular cross-section area of 1.5 mm2 carries a current of 11 A. The resistivity of the material is 2.1 × 10-8 ·m. a) What is the uniform electric field in the...

A piece of copper wire is formed into a single circular loop of radius 12 cm. A magnetic field is oriented parallel to the normal to the loop, and it increases from 0 to 0.55 T in a time of 0.45 s. The wire has a resistance per unit length of 3.3*10^-2 ohms/m. What is the average electrical...

calculate the precent by mass of water in a sample of hydrated copper (II) sulfate. mass of beaker-165.3g mass of beaker with bluestone-173.9g mass of dehydrated bluestone-170.7g Would this be a ballanced equation for this reaction? CuSO4•5H2O+ heat= CuSO4+5H2O so would you do this...

We have a question that asks us what thickness of copper is necessary to achieve optical reflectivity. I know that the answer is just basically several times the skin depth (says 10 times). the only problem is that this contradicts a previous result that I've seen. We can prove that when a wave...

It asks to find the vertical force needed to pull the ball in an unknown fluid at a constant velocity. What formulas do I combine and use to find this? They give you the proportionality constant (0.95 kg/s), the constant speed (6cm/s), and the radius of the ball(1.5cm). I already have: F (y...

If I move a strip of copper mechanically with my hand through a uniform magnetic field will their be a drift velocity? And if so will the drift velocity be in the same direction as the moving copper strip? What would the magnitude of the drift velocity be if this happens? Can you have a drift...

A copper ball with a radius of 1.4cm is heated until its diameter has increased by 0.22mm. Assuming a room temperature of 22*C, find the final temperature of the ball. well what i did was i used linear expansion for this and i didnt get it right. i used (delta)L=(alpha)initial...

The question basically states write a brief overview of the correlation between the properties and uses for copper, iron, aluminium and zinc. Now I know this sounds like a simple research task, it's supposed to relate to periodic trends and their placing on the table. It's in this area that...

I am already known around here for my Iron Oxide [rust], well…how about Copper Oxide too. I am making [black] Copper (II) Oxide by first dissolving Copper (II) Sulfate penta Hydrate (CuSO4 * 5H20) crystals in water to form an aqueous Cu+2 solution. Then I take Sodium Hydroxide (NaOH) and add...

We just did a lab in chemistry. My question is in regards to what chemically happened in the lab. this is what happened macroscopically: procedures: 1.) Copper Chloride Dihydrate is put into water. 2.) One aluminum ball (regular Al that u can get in stores) is put inside this mixuture (1)...

What is the maximum load that could be suspended from a copper wire of length 1.9 m and radius 1.2 mm without breaking the wire? Copper has an elastic limit of 2.9 x 10^8 Pa and a tensile strength of 4.3 x 10^8 Pa. Give your answer in Newtons (N). Any thoughts? I'm completely lost.

i'm having this ridiculous argument over at: http://www6.head-fi.org/forums/showthread.php?t=144514&page=1&pp=20 where we are having a not so friendly disscusion of wire burn in. basicly my question is this does regular copper wire change it's sound if get's "burned-in" over time. now I'm...

When I stick some Copper (II) Sulfate * Pentahyrate into the blue flame of my butane torch, it turns green. When I crush the tiny CuSO4 crystals up into a finer powder and mix them with a mixture of KClO3 and Sugar, then light that on fire, I get a very blue flame. What is happening here? I...

why adding copper to nickel result in reduced magnetism of nickel? :confused:

I was given a small amount of Copper Chloride. When I brought my spatula(dirty ofcourse) the salt turned slightly green. Also when preparing the Sodium extract, I added 1 part CuCl₂ and 3 parts NaCO₃ and 3/4ths water. I stirred it slightly with the spatula, it turned black...

I've designed a electromagnetic vibration shaker but I've problems at high frequencies(200 Hz and upper) and I've heard that I can compensate it by a Copper ring,please comment me...Bahram

does anyone know the reason why they used a copper "impactor" for the deep impact mission? is it for its corrosion resistance? thanks

hi guys 200g copper calorimeter, 200g of water, both intially at 30 degrees. Aluminium rod added to the system, with mass of 250g, final temp is 100 degrees. 10g of water is converted to steam. first its asking to calulate how much energy is reuiqred to vaporize those 10g to steam then...

I made a distillation rig, and it works fairly ok for the most part. The problem is that the condenser is made of copper, and it leaves a strong copper taste in the product. How can I remove the copper from the water? When I say be realistic, I mean don't suggest something like "oh run it...

Hi, just looking into metals and came across silver copper alloy having a density of 9900 - 1.05e4 kg per cubic metre. I have been told me that the value of e is (probably quite randomly) 2.71 and others said that it is an abbreviation for 0, eg. 1,000,000 could be written as 1e6 or 10,000 as...

What is the poissons ratio for copper?

Hey what's up, I am stuck on the following problem. a copper pot with mass of 0.5kg contains 0.170kg of water at a temperature of 20C. A 0.250kg block of iron at 85C is dropped into the pot. Find the final temperature assuming not heat loss. Ok, so Here is what i was thinking about...

hi, sorry if this is in the wrong section, but I am new to the forum! Im doing an A2 physics investigation, and have pretty much completed it all, an got a good set of results, but i need to prove that they are right! i have been using a simple set up by applying a 0.5A current through a...

Hi, I need help with this problem for physics. I know it has something to do with Q=mcT. I can probably do parts b and c if I just get a start on part a. I'm just not sure how to approach it. Any help is appreciated. =) A 50g block of copper having a temperature of 400K is placed in an...

Hi, Part of a question I am working on asks me to "calculate the resistance of 1cm^3 of copper in the form of a thin sheet 0.5mm thick (between the faces of the sheet), given a resistivity of 1.69x10^-8 Ohm metres". Given that p = RA/L, it is clear that R = pL/A = 1.69x10^-8 x L/A. So far...

So i have this problem. An isolated copper sphere of radius 5.00cm, initially uncharged, is illuminated by ultraviolet light of wavelength 200nm. What charge will the photoelectric effect induce on the sphere? The work function for copper is 4.70 eV. Can someone help me conceptualize...

Pure copper metal is orange (or pink after being anodized), copper hydroxide is blue, copper oxide is black. So then why is the statue of liberty green?

What is the best way to etch copper with house hold materials? It is for making print plates.

Does Copper(I) Nitrate plus water { Cu(NO)3)2 (aq) + H20 } yeild Cu(NO3)2 3H20? (unbalanced) From what I've been told, it could equal Cu(H2O)6^+2(aq) but I don't see the NO3 anywhere.