Copper Definition and 513 Threads

Suppose you wish to fabricate a uniform wire out of 1.0 g of copper (Density of copper is 8.93 x 10^3 kg/m^3). If the wire is to have a resistance of R = .5 ohms, and all the copper is to be used, what will a) the length and b) the diameter of this wire? this has me tottally confuzed...

I'm wondering if it make much difference if they used silver instead of copper wire in electric generators? Also, how does switching from silver to copper wire affect the voltage and current, or does it just create some resistance?

Hi I was wondering why high end audio equipment is plated with gold when copper is obviously cheaper and has a lower resistivity. Anyone shed any light on this? Thanks Paul

Is the fibre optic cable cheaper than copper wire for transmission? I believe there is still loses in a fibre optic cable. As the critical angle of glass is 42 degrees, thus about 50% of the signal would be lost. Is that true?

Two identical copper blocks of mass m grams, one at (fundamental) temperature T1 and the other at temperature T2 are brought into thermal contact until they reach thermodynamic equilibrium. The heat capacity of copper/gram is Cv . What is the final temperature Tf?

A diagram shows a flexible copper wire attached to the terminals of a dry cell. A strong circular magnet, 12 mm in diameter, is attached to the side of the cell. The interaction between the current in the wire and the magnetic field of the magnet causes the wire to levitate i.e. _____+ l...

will copper wire wrapped around insulated copper wire induce a current to some degree? and if electricity is flowing through the wire of witch the copper is wrapped around will it induce current in the wrapped wire?

Right. I know if you drop a strong magnet down a copper tube (or conductive but non magnetic tube) it falls slowly as it 'sees' a changing magnetic field and thus induces a current in the tube and this induced current causes its own magnetic field to be induced and acts a resistive force to the...

Homework Statement my data as below diameter of copper wire/m 0.025 (mean) Unstretched part = 0.285m mass(m)/KG extension(e)/m 0.1 0 0.2 0 0.3 0 0.4 0.001 0.5 0.001 0.6 0.001 0.7 0.003 0.8...

I have been told that to solder properly the source of heat is to be directed at the bottom of object to be soldered (6 o'clock), Particularly, During a soldering operation to join two copper pipes.When I asked why that is, I was told it was due to convection distributing the heat around the...

Homework Statement (a) Copper has a breaking stress of about 3.00×108 N/m2. What is the maximum load that can be hung from a copper wire of diameter 0.37 mm? (b) If 17 percent of this maximum load is hung from the copper wire, by what fraction of its original length will it stretch? Homework...

Hello all, I am doing a research which involves hollow copper conductors. I would like to know about some kind of coolant or gas (like SF6) which can be passed through the copper tube to cool it, the temperature of the copper conductor can reach upto 100 degree C. The coolant should cool the...

Hello all, I am doing a research which involves hollow copper conductors. I would like to know about some kind of coolant or gas (like SF6) which can be passed through the copper tube to cool it, the temperature of the copper conductor can reach upto 100 degree C. The coolant should...

Hi all I'd like to heat up a mile of buried copper cable to roughly 100 deg C. The centre core is 80mm dia solid copper with impregnated paper insulation. Maximum spot temp is 150 deg C. I can expose the core at each end and clamp on a heating element. I've got plenty of time =...

Homework Statement A bar of copper has dimensions 0.5605 ft. x 3.545 in x 5.722 cm. The density of copper is 8.921 g / cm3. Copper contains 2 isotopes, 63Cu (69.09% abundant) and 65Cu (30.91% abundant). How many neutrons are in the bar of copper? The attempt at a solution I took the...

Hi, if I have 3 naded wires copper, Tin and Lead wrapped into one cable and I run 12v through it how do I work out the amount of resistance I get and the total voltage at the other end?

Homework Statement copper can be drawn into wires. how many meters of 34-gauge wire (diameter 6.304 x 10 -3 in) can be produced in copper from 8.60 pounds of covelite, an ore that is 60% copper by mass. (hint: treat the volume as a cylinder, V of cylinder= pie r squared, density of copper =...

I'm having problems with this question. A piece of copper wire has a diameter of 0.389mm. If copper has a density of 8.92g/cc, how long (in meters) should you cut a piece of wire to obtain 0.0141 moles of copper? I tried finding the volume of the cylinder and other things, but I'm...

Homework Statement A copper calorimeter can with mass 0.100 kg contains 0.160 kg of water and 0.018 kg of ice in thermal equilibrium at atmospheric pressure. Homework Equations If 0.750 kg of lead at a temperature of 255 C is dropped into the calorimeter can, what is the final...

Homework Statement A copper cylinder is initially at 20.0 C Homework Equations At what temperature will its volume be 0.150 % larger than it is at 20.0 C The Attempt at a Solution \DeltaV =betaV\DeltaT .15=5.1x10^-5(Tf-20)

This is not actual homework. I have not had any course in thermodynamics. I have completed Kinematics and Electrical physics courses at my university. My degree is related to Computer Science, not Engineering or Physics. I am asking if my solutions to these questions are relatively correct...

What is the advantage/disadvantage of Cobalt X-ray tube over Copper X-ray tube in a X-Ray diffractometer

Does anyone know what kind of glue i can use to glue a thin sheet of copper to a cork?

Hello guys have a little problem see if anyone can help Homework Statement Q the primary winding resistance is 125Ohms, Secondary is 0.7ohms calulate the transformers copper loss at full load. now the transformers name plate is 240V 50Hz 28VA the earlier question explains...

I'm working on a project, and I need to make coils out of 5/8" diameter copper rod, ideally with center line radii ranging from 3 - 10 cm, and with turn heights of 5 cm. Most metal shops near me don't have the capacity to do this, because there rolling machines are based off of cold bending...

Not really a problem but a concept I am having trouble understanding and I was hoping someone can explain to me better. We performed an experiment in lab last week on finding the Young's modulus of copper by projecting a laser on the wall to magnify the effect of the change in length of the...

Homework Statement (a) A 0.5kg mass of copper (specific heat 385 J kg-1K-1) at 600K is plunged into a litre of water at 20C. What is the equilibrium temperature, T2, of the system? What is the change in entropy of the water? (b) A litre of water is heated slowly at a constant rate from 20C...

Hi all, I'd eventually like to form a trumpet receiver and bell out of pure copper, and the standard method to do that, from what I know, is electrodeposition. This is done using a mandrel made of iron or something else with a lower reduction potential than copper's. I've calculated...

We have a formulae to find energy contained by an EM wave, which finds energy per unit volume. Also says it is equally distributed between E and B fields. How do we find EM energy for an EM wave of 50Hz in a copper wire? Because it is low frequency, instead of space we guide by conducting...

how can a single copper cable carry all the different frequencies and prevent them from interfering with each other and destroying data? (I posted this question in the physics forums because it has to do with waves and frequencies)

Homework Statement What is the actual value for the young's modulus of copper wire in N/m?Homework Equations The Attempt at a Solution

Homework Statement A 500 g copper block at 80 C is dropped into 1.0 kg of water at 10 C. Find the entropy change of the system. Homework Equations dS= integral of dQ/T The Attempt at a Solution I found that the final equilibrium temperature is 290 K using the equation...

Homework Statement find the young modulus of copper through calculating the stress and strain, plotting on a graph and finding the gradient of the linear part of the graph Homework Equations ym=stress/strain stress=force/ area strain= extension/length The Attempt at a Solution...

Homework Statement Suppose you wish to fabricate a uniform wire out of 2.1 grams of copper. If the wire is to have a resistance of 0.3 ohms and if all of the copper is to be used, what must the diameter of this wire (in mm) be? Homework Equations mass (in kg), cross-sectional area...

A scale reads 220N when a piece of copper is hanging from it. What does the scale read when it is lowered so the copper is submerged in fresh water. From a given chart Density: copper is 8930 kg/m^3 fresh water is 1000kg/m^3 I found my volume of copper to be .0025m^3 I'm just not sure which...

Homework Statement The top wire is 1.00 mm diameter copper wire and is suspended in air due to the two magnetic forces from the bottom two wires. The current flow through the two bottom wires is 95 A in each. Calculate the required current flow in the suspended wire. Homework...

Homework Statement A 10 ohms Nichrome resistor is wired into an electronic circuit using copper leads (wires) of diameter 0.6 mm with a total length of 50 cm. The additional resistance is due to the copper leads is 0.03 ohms. What change in temperature would produce a change in resistance...

Homework Statement Cu2+OH-, and Br- form a mixed salt formula Cux(OH)yBrz. In an experiment to determine the values of x, y, and z in the formula of this compound, .760 g CuBr2 (223.4 g/mol) was dissolved in water and reacted with 10.22 ml 0.555M NaOH. Assume that in this reaction, all of...

I caught a really interesting program on TV - Man vs Wild. http://dsc.discovery.com/fansites/manvswild/manvswild.html The host, Bear Gylls, was dropped on top of a remote range in the Copper Canyon area of Chihuahua, Mexico - at 9400 ft (2865 m). The day time temperature was ~70+°F, but at...

Homework Statement We are doing a lab where we react 2.00 g of strontium nitrate (dissolved in water) + 2.00 g of copper (II) sulfate pentahydrate (dissolved in water). I need to make sure that I did the balanced chemical equation right? we eventually have to find the theoretical yield. The...

Hi I was wondering if I took two peices of copper and held them together then ran a current through the connection what would the resistance of that be? Would it theoritically be zero, but in real life be some very small but insignificant amount? Thanks

Hi all, I am planning some electrical installation in my home and I am not sure about the norminal current that the wire can tolerate. can any give me the ref table or some link of that, I mean for certain diameter (mm), the wire can bear a current (amp). Thanks

I'm not sure if this question belongs in the forum or the physics forum, I guess I'll post it there as well. I'm trying to calculate the temperature rise in a coil of wire (27AWG) wound around a toroid. The current through the wire is ~0.5A with a calculated voltage drop of 14.64mV across the...

Homework Statement Calculate Youngs Modulus for the copper wire We have done the experiment today, here is the data: (KG)/F(N)/x(M) 0.1/0.1g/0.0 0.2/0.2g/0.0 0.3/0.3g/0.001 0.4/0.4g/0.001 0.5/0.5g/0.002 0.6/0.6g/0.003 0.7/0.7g/0.004 0.8/0.8g/0.005 0.9/0.9g/0.006 1.0/1.0g/0.009 1.1/1.1g/0.029...

Homework Statement I am stuck on a HW problem. A square loop of copper wire falls out of a side 'a' and radius 'r' falls outside of a magnetic field 'B'. How does one find the terminal velocity? B = 1.2T a = 5cm r = 1mm Please help me set up this problem so I can solve it and figure out...

Copper tubes in air conditioners...quick questions..need ur help urgently.. hey there.. I have an assignment where I have to choose a material and research about.. anyway, I chose to talk about copper tubes in air conditioners..My question is.. what is the function of this tube? What is...

http://www.treehugger.com/files/2006/04/peak_copper.php http://www.thenational.ae/article/20080807/FOREIGN/629722880/1013/ART&Profile=1013 Any truth to this, or is this debunkable?

Homework Statement The atomic mass number of copper is A = 64. Assume that atoms in solid copper form a cubic crystal lattice. To envision this, imagine that you place atoms at the centers of tiny sugar cubes, then stack the little sugar cubes to form a big cube. If you dissolve the sugar, the...

Homework Statement i need to find the radius of a copper wire given the following data: resistivity is 0.25 ohm meter length of wire is 200 m Homework Equations roe=RS/I roe=resistivity R= resistance of material S=cross sectional area I= length of specimen The Attempt at a...

Homework Statement what is the resistance of copper wire in this situation? 200 meters long strand of wire, with a resistivity of 0.625x10^-6 Homework Equations im not sure if this is the right equation but: resistance=resistivity x length/area The Attempt at a Solution this is the...