Metal Definition and 999 Threads

This is my first post on this forum because I have a question that I cannot seem to answer myself. At my working place we have a machine where a metal conveyor belt is running through a section of the machine where the temperature is constant at 320 degrees Celcius. On this conveyor belt are...

Homework Statement Two small metal spheres, A and B, of mass mA = 6.5 g and mB = 12.7 g have equal positive charges of 8 μC. The spheres are connected by a non-conducting string of negligible mass and with length d = 1.4 m, which is much greater than the radii of the spheres. a) What is...

Homework Statement At 25C Cu metal (at. wt. 63.54 g/mol) has a molar heat capacity of 24.4 J/molK. The density of Cu is 8.949g/cm^3 at 0C and 8.904 g/cm^3 at 100C. Assuming that Cp is temperature independent, calculate Q, W, deltaU and deltaH when 100grams of Cu metal are heated from 0C to...

Homework Statement A metal rod with a 0.5 inch diameter is subjected to a 2000 lb tensile load. Calculate the resulting diameter of the rod after loading. Assume that the modulus of elasticity is 10,000,000 psi, Poisson's ratio is 0.33, and the yield strength is 21,000 psi. Homework...

Homework Statement I would really appreciate help understanding how the answer is reached in this question: Setting the scene: three metal sphere's are in fixed positions R (+Q), S (+2Q) and T (+3Q): +Q +2Q +3Q...

:bugeye:Hi All... I am really confused about the mechanism of loss of energy when an EM wave hits a metal surface. I always thought the reflection was due to the motion of the electrons in the metal (due to the electric field of the wave). Which suggests that resistive losses would come...

Hey guys.i have heard it has been experimentally proved that even atoms can tunnel through a metal surface.I tried searching all over the web but just could not get any references on that.So,is that true?if somebody know where i can read more about that experimental proof,please point it out...

Homework Statement Using the method of images: discuss the problem of a point-charge “q” inside a hollow, grounded, conducting-sphere-shell of inner radius “a”. That charge "q" is located at {\left| {{{{\bf{\vec r}}}_0}} \right|}. We don't care about its angular position. Oh yes: the problem...

How does shining light on a metal affect it's conductivity? Specifically, I'm wondering about IR light (1.5um) shining on either Aluminum or Gold. My intuition would say that if the metal isn't a perfect reflector and has some absorption, it would increase the number of carriers, thus...

Hi guys, I am new at this so sorry if i get the format wrong. Im trying to build a basic metal detector that will respond when a steel pendulum passes nearby. A simple response is all that is needed right now. I thought of this: Building a RL circuit with a copper coil air core. placing a...

Not to long ago there was a lot of hubbub about nano plating and the low costs that comes with it. I was curious if anyone knows whether or not nano plating is commercially available yet or if its still in the research phase? I've got a lot of applications for gold and silver plating and would...

"Blended metal" bullets; much heat after impact? Can anyone tell me? These bullets supposedly will penetrate body armor, but not drywall, and are alleged to pretty well explode when going through flesh. I've read a report by a contractor who used one in Iraq and said the soft tissue damage...

Does anyone know how to calculate the capacitance of a metal strip of width 2a and infinitesimal thickness? The length of the metal strip is much larger than its width. Thanks a lot!

Say you have a 1kg piece of metal (1kg EXACTLY) at an arbitrary, constant temperature. You make a scratch in it with a needle, and you do it carefully enough that you don't rub off any atoms off the metal onto the needle, that way you still have 1.00000000000000000000000000... kg of metal in...

I work as a machinest and Mill mostly aluminum. I was wondering if the billets are Aluminum its crystalline form? Or just lots of Aluminum atoms held together by Metallic bond? thank you. Attached is a photo of Aluminum Block.

How do you colour metal? What are some advantages of corrosion? What are the methods one can use to stain mental or change the colour of metal as the Apple company does to create the wide range of different beautiful colours that their iPod's come in?

hey guys, I've been given an assignment on the topic of eddy currents and magnetic induction. We have been given info that when a magnet slides down an incline over a magnetic sheet, the eddy currents in the metal acts as a braking mechanism (lenz's law). I've done some research and what i...

Hi Why does Ni only form NiO with oxidation state of +2 whereas the other transition metals form a wide range of oxides with variable oxidation states Thanks

http://www.msnbc.msn.com/id/29900981/ "One of the first compilations used molten antimony and magnesium as the charge holders with a layer of sodium sulfide between the two."How does this work? What chemical reaction is taking place between the metals and the salt?

Homework Statement Two uncharged metal spheres, spaced 15.0 cm apart , have a capacitance of 24.0 pF. How much work would it take to move 12.0 nC of charge from one sphere to the other? Homework Equations V = Q/[4(pi)eor] (delta)K + (delta)U = 0 *I think The Attempt at a Solution...

? (How to vibrate a metal object with certain frequency) Hi there I was conducting an experiment and I have to vibrate a metal object with certain frequency. I had to ask can we vibrate a metal object with certain frequency , if yes please suggest me the ways. Thank you

Imagine you have a rod half of which is made of copper and the other half is made of polythene (insulator). If the rod is held from the insulating part (and so it's not earthed) and the copper part is rubbed vigorously with a very dry cloth, will it be charged or not? In short I want to know...

Hi guys, I am working on a Automation project and I am wondering whether there is any probe that can emit signal to a standard PLC when iron rod is found inside a concrete wall. Personally, I hope it can be avaliable from RS. Thanks for your kind help in advence.

I am sort of having a brain fart about this, when sending electricity threw a metal it becomes negatively charged correct? |-------------------------------------------------< |-->(Positive)Power(Negative)-------->Metal-------^ The electrons leave the negative terminal, pass threw the...

Hey , I am not really the most brightest student when it comes to physics and i really don't understand it at all . but we are doing a prac in class and here it is Theory: A Clamped metal strip has a natural frequency of vibration which is related to its length. The shorter the leng, L the...

As the title says (and yes, I know it sounds a bit weird), what's the best way to make a warmable metal plate (70*45 cm big), using electrical warming? I've been thinking about using induction heating to make the plate warm, but I don't know the best way to do it. It should be battery driven and...

Homework Statement A conduction heat wave is caused to pass through a metal bar of average temperature Tmean = 35.0 °C, altering its temperature sinusoidally with an amplitude of Ti = 2.0 °C. The equation which gives the temperature, T(x,t), of the metal bar at any place x (in meters) inside...

Homework Statement A metal plate (with mass = 7kg and Length = 1.6m) is leaning against a frictionless wall and made an angle (Phi). The foot of the plate is made of circular edge that is situated at a V-grooved gap with angle (Theta). There are three normal force: F(wall) for the normal force...

I need a piece of .125" steel sheet metal to be 21" wide after a 1" lip is bent to 90 degrees on one side. How wide does the initial piece of steel need to be before bending in order to achieve this? I know it will be more than 22", but how much more? If I recall its fairly simple to figure...

Homework Statement A neutral metal rod of length 0.35 m slides horizontally at a constant speed of 9 m/s on frictionless insulating rails through a region of uniform magnetic field of magnitude 0.6 tesla, directed into the page as shown in the diagram. Before answering the following...

Homework Statement A piece of metal at 80C is placed into 1.2L of water at 72C. This thermally isolated system reaches a final temperature of 76C. Estimate the overall change of entropy for this system. Homework Equations deltaS = Q/T Q=m*c*deltaT The Attempt at a Solution I...

Homework Statement A metal loop is attached to an axle with a handle as shown. The north pole of a magnet is placed below the loop and the handle turned so that the loop rotates counterclockwise at a constant angular speed. On the two diagrams below, indicate the direction of the induced...

Hi, I have been looking for a better explanation of the following question in different threads, but although there are some related question, I haven't found one that answers my question. I have read in Atkins-Physical chemistry book the following (summarized) explanation about why metal...

I am first year EE student so forgive me if there is huge lack of knowledge. While reading ahead in my physics book I found out that metal detectors in airports, courts etc are basically transmitters and receivers. If metal gets in between the detector sets off the alarm. What if then, there...

I watched this documentary a few weeks ago and want to recommend it. Film crews follow a heavy metal band located in Baghdad from 2002-2007. It's really less about the music and more about the personal experiences and struggles this band of young men go through. It really puts a human face on...

Homework Statement A metal object is suspended from a spring scale. The scale reads 920 N when the object is suspended in air, and 750 N when the object is completely submerged in water. a. Find the volume of the object. b. Find the density of the metal.Homework Equations d=m/v or v=md or m=dv...

Homework Statement The number of vacancies in a metal increases by a factor of six when the temperature is increased from 800K to 1000K. Calculate the energy for vacancy formation assuming that the density of the metal remains the same over this temperature range. Homework Equations Nv= N...

Homework Statement For a metal coil, if a magnetic field is being applied parallel to each circular loop, why is there torque being exerted on the coil? Homework Equations torque=(magnetic field)(area)(current) The Attempt at a Solution When I cross the current with the...

This is an excerpt from my physics textbook. Consider a piece of metal that is electrically isolated from the rest of the universe so that no new charge can jump on or off the metal. If we wait long enough, all mobile charges(electrons) in the metal will come to rest and be in static...

In Industry, what kind of plants would need to measure metal ions in their process streams. Ions that interest me are copper, nickle, iron etc. I've been trying to find some information, but only found some limited information on nickle but it did not include the information that I want, what...

Homework Statement Two square metal plates are placed parallel to each other, separated by a distance d= 2.34 cm. The plates have sides of length L= 0.750 m. One of the plates has charge Q=+ 2.70 x10-3 Coulombs, while the other plate has charge -Q. What is the magnitude of the electric field...

Homework Statement How does the resistance of a piece of metal change if both its length and its diameter are reduced to one half their original values? Question 1 answers It is increased to 4 times the original value It doubles It remains unchanged It is halved It is...

Homework Statement Consider a rectangular block of metal of height A, width B, and length C, as shown in the figure below. If a potential difference V is maintained between the two A B faces of the block, a current IAB is observed to flow. Find the current that flows if the same potential...

Homework Statement What is the capacitance of the two metal spheres shown in the figure ? sphere one has 20nC of charge and the other has -20nC of charge. The change in voltage is 100V Homework Equations C=Q/(change in V) The Attempt at a Solution My question is how do yo...

I design percussion instruments and I have been researching for some time now the acoustic properties of different common alloys such as phosphor bronze, brass, copper, nickel silver (german silver) and so on... Specifically I want to test the amplitude and frequency modes of each. This would...

Does anybody else love science fiction? Does it involve bipedal machines? Did you really like all of the Metal Gear Solid games? I ditto all of the above! But one question strikes me (besides asking myself if Hal Emerich scientific lingo actually makes sense) how will we power these...

Hi guys I have the Hamiltonian, which describes my lattice of NxN metal atoms, and their mutual coupling. What I need is the density of states of this lattice, and I am quite sure that there is a way to find it from my Hamiltonian; I just need to find out how. What I thought was that I can...

Homework Statement A piece of metal of weight 50 grams is heated to a temperature of 100°C and then introduced into a calorimeter containing water at 14°C, the maximum temperature reached being 20°C. If the weight of the calorimeter is 5 grams, the specific heat of the metal of which it is...

Homework Statement Find the capacitance per unit length of three long coaxial metal tubes, with radii a < b < c . A wire connects the innermost and outermost tubes (radii a and c). Homework Equations The Attempt at a Solution I'm a little confused as to how I should set this...

Homework Statement An infinite, thin, uniformly charged rod (line charge density lambda) is placed parallel to a metal plate a distance d above it. Calculate the E-field close to the surface of the plate as a function of perpendicular distance to the rod. Homework Equations The...