Metal Definition and 999 Threads

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 Find the quantity of thermal energy absorbed but the water in the calorimeter. Mass of metal sample:69.64g Water sample: Volume 190mL Temp: 24'C boiling water: 275mL temp of boiling water:90'C Sample in Calorimeter Initial Heat: 25'C 30 seconds: 26'C 60 seconds 26'C 90...

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...

Hi there~ I have some questions about hydrogen storage alloys. (TiFe, ZrV2, LaNi5, Mg2Ni, etc.) As far as I know, the hydrogen sorption precesses are as following: Hydrogen molecules "physically" absorbed on the surface of alloy which is called alpha-phase. Hydrogen molecules become...

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...

If you put a piece of very hot metal in cold water the heat in the metal will transfer to the water until both are the same temperature. So the system water-metal still has the same initial energy. So my question is how does the piece of metal cool if it is put on a perfect vacuum. Is it...

Homework Statement A solid metal sphere has a radius of 10.0 cm and a concentric metal sphere has a radius 10.5 cm. The solid sphere has a charge 5.00 nC. (a) Estimate the energy stored in the electric field in the region between the sphere. Hint: you can treat the pheres essentially as...

Homework Statement I have always been told to remove anything metal before walking through a metal detector. Why is it bad to take a laptop through a metal dector? How can I give me answer in the language of physics? I cannot just say that it will probably scramble my internal memory and...

A square rigid metal frame PQRS, of side 12 cm, forms a closed circuit with an ammeter. It is moved through an enclosed region of uniform magnetic field of flux density 2.0 × 10–2 T, from left to right. The field is confined to this area and directed into the page. PQRS --> magnetic field -->...

I want to use an "inductive proximity sensor" for metal detector gate, but the problem is its range is (generally) under 50mm (2 inches), is there any way I can increase its range? or is there any alternate sensor or way to detect the metal ? Thank you. Faraz Nizamani

Homework Statement What is the density of lithium metal in g/cm^3 if a cylindrical wire with a diameter of 2.40mm and a length of 15.0cm has a mass of 0.3624g?Homework Equations D=m/VThe Attempt at a Solution The problem I'm having is I don't understand what the problem is asking. How do you...

Homework Statement A metal sphere centered at the origin has a surface charge density that has a magnitude of 24.6 nC/m2 and a radius less than 2.00 m. At a distance of 2.00 m from the origin, the electric potential is 540 V and the electric field strength is 270 V/m. (Assume the potential is...

I roughly understand that when we hit a metal rod right into the end will excite longitudinal vibration in the metal rod, and the place we hold will be a node. the position i hold will kind of determine the frequecy of the ringing sound produced. Is that right? But what will happen if we hit...

I have an electrode that I'm trying to model. It's got v=0 at z=0, and v=V at z=H. I've been playing around with the poisson equation, and keep getting terrible solutions to PDEs involving Bessel functions. Anyone know if there's a better way to do this (since I can't seem to solve it with the...

I was just curious of something and was wondering if anyone could shed some light on this. I have a metal screen (like the kind you have on your water taps). I think it is made out of steel or something? Anyways, I was bored one day so I put a lighter up to it till it started glowing red...

At first I thought it would be ridiculous to ask this question in a forum but, in reality it's probably the best place ironically. (background information) I am a recent college graduate. Metal Casting technician. 26 years old, and basically decided to self-cure my Social phobia. No offense to...

A free-hanging, easy ball to the surface coated with aluminum foil, recharged by a metal rod, one end of which affect the ball (figure A). Charge is introduced with metal rods the other end, as it touches with a charged coating rod. The ball makes rulings that show that the metal rod and had...

I am with a search team who use Mobile Signal to guess the whereabout of missing persons. I was told that for 900MHz GSM Signal can go as far as 30km if weather permits. I know where the station "B" is, it is about 20km away from my current location "A". At "A", I can receive somewhat...

Just wondering, how could you influence the number of photons emitted from a metal surface. I would assume that increasing the intensity of the light would cause an increase because the intensity is a measure of the amount of photons traveling in the light. But what about other factors such as...

Hello, Chemistry grad student here about to start a physics-y project...so trying to learn about condensed matter physics. I get how screening works when you add a single charge to a gas of electrons, but what happens in a metal when you have a whole lattice, ie, a background charge density...

I have a problem I can't seem to solve. here it is and here is what I have gotten. Iron metal is produced in a blast furnace through a complex series of reactions the involve reduction of iron(III) oxide with carbon monoxide a. Write a balanced overall equation for the process, including the...

Hello, I've read that metal film resistors are better than carbon film because they're resistance remains constant even when they heat up from being soldered. And I know they're suppose to be more precise with a 1% variance instead of 5% of the carbon films. I know capacitors go bad - do...

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How do I find the total electron count in a transition metal complex? For example, something simple like W(CO)6 or even more complicated like RuH(Cl)(PPh3)3? (Note: I don't mean "d electron count" [which I know how to find], I mean "total electron count.")

Dear Gurus, :) I am not sure what metal is suitable for the following kind of application: 1. this metal should allow a magnet to stick on to it via magnetism. 2. when the magnet is removed from this metal, it should not be magnetised in any way. That is, after using it with a magnet...

Hi people, I have a question which i hope you helpful guys/gals can help to shed light on. We all know when we strike one end of a solid metal rod with a hammer sideways (i.e. from left to right), longitudinal vibrations will be set up across the length of the rod. Textbooks and websites...

Alright, this is a hypothetical problem for my math class, (but it seemed to fit here better than calculus help) and though I am allowed to site sources, I don't necessarily want the answer just given to me (I mean, I'd really like to figure it out). Homework Statement Treatment lasts...