Metal Definition and 999 Threads

If a hot metal forging is cooled by dropping it into a pool of water, how many boundary/initial conditions do I need to solve for the temperature? I don't want to make any assumptions about temperature gradients within the forging itself (Biot number may be large, which precludes use of lumped...

Alright, I'm not really a physics major or a scientist, but I do have a basic understanding of physics. In fact, I'm actually a writer and right now I'm trying to research the physics of what this thread is titled as, a metal planet. Problem is since I'm not a physics major or scientist, I sort...

Homework Statement A total charge Q is shared by two metal spheres of small radii R1 and R2, that are connected by a long thin wire of length L. Fin (a) the charge on each sphre and (b) the tension in the wire. Source: Haliday 4th edn chapter 26 q. 91, p. 738 The Attempt at a Solution...

A 6.0kg metal ball moving at 4.0m/s hits a 6.0 kg ball of putty at rest and sticks to it. The two go on at 2.0 m/s. a) How much energy does the metal ball lose in the collision? b) How much energy does the putty ball gain in the collision? c) What happened to the rest of the energy? For a)...

Homework Statement Put a hot metal ball on parallel horizontal rails. The ball starts to move. Investigate the phenomenon. Homework Equations I have found two equations, one exponential and one linear relating the expansion of the rails and the ball to the temperature increase...

Homework Statement Sodium, aluminium and silver have work functions of 2.46, 4.08 and 4.73 eV respectively. Which, if any of these metals will emit photoelectrons when irradiated by Balmer-B photons from a hydrogen discharge lamp? Homework Equations Energy = 13.6(\frac{1}{n_{1}^{2}}...

Homework Statement When light is frequency 2,00 x 10(in 16force) Hz prostrate a metal surface electrons are abstracted with kinetic energy 7,50 x 10(in -18force) J. Calculate: (a) The frequency v0 for the metal (v0: the minimum frequency of light, below which no electrons emitted). (b)...

Homework Statement Chromium metal, Cr(s) can be prepared from reacting chromium oxide, Cr2O3(s), with aluminum, Al(s). Al2O3(s) is a by-product. Assume a reaction of 20,0 kg of chromium oxide with 5,00 kg of aluminum metal. 1)how much Chromium metal will produced from the above reaction? 2)...

Hi all, If i have a charged plate of charge Q coulumbs, then what is the energy contained in it? Is the energy independent of the way in which i managed to get a single plate of Q columbs charge? In the sense , suppose in the beginning there were two plates of charge +Q, -Q columbs...

Just wondering.

do anyone knows how to find poisson's ratio of nimonic 115 nickle based alloy?i try google it can't found it::frown:.It took me two hours for nothing..

Homework Statement we are mixing CuSo4 (Cu2+) with an iron (Fe) powder and we are trying to determine whether Fe2+ forms or Fe3+ now the question is : suppose that 1.0 g of iron is used in the experiment. what is the minimum volume of Cu2+ solution that must be added in order to completely...

Two small metal spheres are located 3.0 m apart. One has radius 0.48 cm and carries charge 0.15 uC. The other has radius 0.95 cm and carries charge 0.090 uC. If the two spheres were suddenly connected by a thin wire, how much charge would move along it? This is a question that I have been...

This is my first question in this forum. And here it is, How do you make an insulated metal sphere has a net positive charge with a negatively charged rod? If the rod touches the sphere, the sphere will have negative charge. If I connect sphere to ground, bring the rod near the...

Don't exactly know where to put this but how would one examine the spectra of a metal ore to find what is in it? That being, not using a mass spectrometre.

Homework Statement A steel bar 10cm long is welded end to end to a copper bar 20cm long. Both bars are insulated perfectly on their sides. Each bar has a square cross section, 2cm on a side. The free end of the steel bar is maintained at 100 celsius and the free end of the copper bar is...

Homework Statement Immediately outside a very long cylindrical wire of radius r1 = 1mm, the electric field is 40kV/m directed towards the wire's surface. A hollow cylindrical metal tube with inner radius r2 = 3mm is now placed around the wire, to form a coaxial cable. What will be the charge...

If you have a lump of metal would it make a louder noise if it hit glass or metal?

. Homework Statement A metal bar is free to slide without friction along two parallel metal rails. The circuit is completed by a battery. (conducting bars are in the x direction, left side of drawing the conducitn bars are connected by a battery, the right side is where the metal bar is) If...

Hey ... I'm trying to study for my PhD qualifying exam, and I have a bunch of questions from previous years, but no answer keys. Homework Statement A think uniformly charged rod of length L is positioned vertically above a large uncharged horizontal thick metal plate. The distance between...

This question came up at work. Can metal alloys be separated into their constituent components? How? Thanks.

hi, I'm a web developer so i usually stay in front of a computer for almost 12 hrs a day. my question is, when i get up from my computer and hold a metal, ex. faucet or a spoon, or even a refrigerator holder i get electrocuted. FYI, by the way, i got a surgical implant in my right hand...

If yes how about in comparison to water? I ask cause I was wondering how they stop the metallic fuel injection tubes from rusting out. Is there a coating or does it just not rust in presence of gasoline? Im assuming that gasoline doesn't rust since its a hydrocarbon and water contains O, and...

Why does charge given to a hollow metal sphere reside only on its surface?

hi, everyone, now I am trying to deposite some metal layers on micro-scale cantilever surface on the purpose of bending it under the residual stress caused by metal deposition. I read some literatures which mentioned and even gave the exact value of residual stress happened in both the...

hi.. i have a problem that i need to solve.. in the attached mage, there is a submerged object in water cousing na upward lift force of 100kg. above it is a lever with a weigh attached to it weighing at 90kg. wll this weight difference be enough to move the metal wedge from point a into point...

A metal sphere of radius R = 10 cm carries a total charge Q = 0.4 μC. A. What is the magnitude of the electric field just outside the sphere, and in which direction is it pointing? B. What is the magnitude and direction of the electric field just inside the sphere? I have already found...

Homework Statement A 50-g of ice, initially at 0.0C, is dropped into 200 g of water in an 80-g aluminum container, both initially at 30C. What is the final equilibrium temperature? (Specific heat for aluminum is 900 J/Kg*C, the specific heat of water is 4186 J/Kg*C, and...

Just wondering: If a metal sphere is charged, will the extra charge be uniformly distributed over the volume of the sphere. i think that it will? but not sure about it being uniformly distributed.

Homework Statement A metal tube with length 931m is hit with a hammer. On the other end two sounds with time delay of 2.5 seconds can be heard. What is the reason for this? What is the speed of sound in the metal? Homework Equations t=L/v The Attempt at a Solution I think the...

Dear friends, I'm having trouble understanding an article by M. Cohen and J. Corkill (Structural, bonding, and electronic properties of IIA-IV antifluorite compounds). In this article Be2Si (an imaginary compound) is shown to be a metal. The argument used is GROUP SYMMETRY :... group symmetry...

good day, this place is great, and i just got questions an AC electric arc furnace melts metal by way three electrodes and electric arcs generated by potential differences inside the furnace i had the opportunity to watch one in action and understanding the programming i see it controls...

Homework Statement A metal ring 4.50 cm in diameter is placed between the north and south poles of large magnets with the plane of its area perpendicular to the magnetic field. These magnets produce an initial uniform field of 1.12 T between them but are gradually pulled apart, causing this...

I'm having trouble finding a suitable material to keep critters from nesting under our solar panels. Galvanized steel mesh oxidizes quickly because being attached to the solar modules, and plastic mesh just isn't strong enough and looks unsightly. I need a steel or metal mesh that will not...

Metal Bands! Which ones are youre favorites? I envy those of you who lived through the 80's listening to stuff like AC DC, Maiden, Led Zep, GnR. Music was HUGE then! I mean, the money's still there, but rockstars were Gods man! I don't think there's anyone in music today who's as big or iconic...

How do they discriminate between good (targets ) and rubbish, it seems that the orientation of the (Target) can fool the detector, from using one of these detector for many years , i find that the depth of the (Target) is instrumental in the discrimination, and only after years of (detecting)...

Homework Statement A metal ball with radius R = 0,6 m is charged with Q = 0.15 nC. Find the electrical field as function of the distance r from the center of the ball. The Attempt at a Solution Gauss law: Q = e0*E(r)*A = e0*E(r)*4*pi*R^2 which gives E(r) = Q /...

I'm trying to get a better understanding of this sort of thing. Here is what I know... A postive point charge "q" is placed at the center of an uncharged metal sphere insulated from the ground. The outside of the sphere is then grounded from the outside. Then the ground wire is removed. A is...

Homework Statement 21. A certain transmission line is constructed from two thin metal “ribbons”, of width w, a very small distance w<<h apart. The current travels down one strip and back the other strip. In each case it spreads out uniformly over the surface of the ribbon. a) Find the...

Homework Statement An inflatable metal balloon assumed to be spherical with radius R is charged to a potential of 1000 V. After all the wires and batteries are disconnected, the balloon is inflated to a new radius 2R. Does the potential of the balloon change as it is inflated? If so, by what...

If you take a screwdriver for example, and hit it a few times near the tip with a hammer or something hard; why does the screwdriver become magnetic? I was shown someone doing this, and shortly afterwards it was able to attract nails or screws around.

A compact disc contains an extremely thin sheet of aluminum. If you put a larger block of metal in a microwave oven along with a CD and turn the oven on, a) nothing significant happens b) only the metal will spark and then melt c) the metal will melt and the CD will spark d) only the CD...

Homework Statement A proton orbits a 1.0-cm-diameter metal ball 1.90 mm above the surface. The orbital period is 1.50 \mu s. What is the charge on the ball? Homework Equations F_{cp} = \frac{m v^2}{r} F_c = \frac{k q_1 q_2}{r^2} The Attempt at a Solution Since the proton is...

Anyone heard of the band Meshuggah? Their beats and timing are very interesting. Like windshield wipers on different cars, oscillating at slightly different frequencies. I Just thought they must be into math and physics.

Homework Statement A metal plate in the shape shown has a mass of 2.00kg and hangs from a pivot point located a distance d=0.300m from its center of mass. Its moment of inertia, I_cm, about an axis perpendicular to the plate and passing through the CM is 0.210kg*m2. Calculate the magnitude...

the capacitance of two metal sphere system Homework Statement What is the capacitance of the two metal sphere system. *The question has been attached shematically. All the variables are given in the attached file, there is no missing variable. thx for any help.

Hi all, I've been struggling with the concept of equilibrium and steady state in a metal wire. Can anyone of you please help me get this important concept down? I'd really appreciate it. -- Homework Statement Which of the following statements about a metal wire in equilibrium are...

Hi, I understand what make metal a conductor of electricity, but what allows it to conduct heat? Is it that it does not absorb heat because it's electrons are easily liberated?

When you put a metal (conducting) spoon inside a microwave, it takes a few seconds, and then you get sparks, that might damage the microwave. I heard (and cowardly hadn't tested) that putting a spoon inside a cup of water would allow a long 5 minute heating, no sparks and no damage. The riddle...

Just looking through some old papers and found a problem that I don't know how to solve. Two identical 1.0-kilogram blocks of copper metal, one initially at a temp OC and the other initially at a temp of 100C are enclosed in a perfectly insulating container. The two blocks are initially...