Metal Definition and 999 Threads

Hi all I am a newbie here, so please go gentle It is along time since I have had to use Thermal Co-efficients of expansion for various metals. However, I am trying to tie in some figures I have been given to what I know to be reality. i am sure that I am doing something basically wrong...

Hello to all, I have a question concerning what thickness of plate steel to use for a tree spade that I'm going to have made to help with transplanting some trees. The intent is to have a spade that cuts 1/4 of a cone that is 24" in diameter and 18" deep. After cutting the tree's root ball...

Hello everybody. I would like to ask the following: Imagine a source of strong electric filed. For example a positively charged metal sphere. Then we put a small (relatively to the source of the electric field) metal object in the electric field. Electron inside the metal move in such way, that...

How the ductility of metal change when grains is decreased ? Hello every body, I'm from Vietnam. I have a question that : if we decrease the size of the grain of metal by heat treatment, what happen to the ductility of that metal, increase or decrease, and why ? for example, the metal of plain...

Hi Here is a problem I am trying to do. A point charge q is located at a distance r from the center O of an uncharged conducting spherical layer whose inside and outside radii are equal to R_1 and R_2 respectively. Find the potential at the point O if R_1 < R_2. Now I was thinking of method of...

I've just really started getting into more symphonic/melodic metal and I stumbled across Therion. Their pretty awesome and I would love to hear some bands that are in the same style as them. Any suggestions would be greatly appreciated. Here's a great Therion song for anyone who hasn't...

When a more reactive metal displaces a solid metal oxide, a lot if heat is required for the reaction to occur. However, both metal and metal oxide can be solid for the reaction to take place right?

In the lab you place a beaker that is half full of water (density pw) on a scale. You now use a light string to suspend a piece of metal of volume V in the water. The metal is completely submerged, and none of the water spills out of the beaker. Give a symbolic expression for the change in...

I am having trouble understanding how current can move through an electrolyte solution that does not contain ions of the metal of which the electrode supplying the current is made. For instance, if a silver wire were submerged in a solution of potassium chloride and, how would current pass into...

as zinc is having completely field orbital sp2 ...why it is metal ? why it is having low melting point?

http://www.huliq.com/10282/ufo-sightings-reveal-more-strange-metal-boxes-along-coastal-beaches This is one of the strangest stories I've ever run across. It is very hard to believe. Respectfully submitted, Steve

Homework Statement A metal sphere of radius 0.15m carries an initial charge Q1 = +6.4x10-6 Coulombs a) show that this amount of charge is insufficient to ionize the surrounding air. b) your body, initially neutral, and the soles of your shoes are made of insulating material. You move...

As the title says, a guitar effect I built introduces a lot of white noise, which goes away when I touch it's case. I removed the circuit from the case and found the noise also goes away when I hold the input sockets. How do I fix this? Thanks for any help!

When I place a metal bar near a Van de Graaff, which generate hugh amount of positive charges on its surface, if I hold it for a period of time, will it be possible to magnetize this metal bar? what happen to its internal molecula structure? Does anyone have any suggestions? Thanks in advance...

Homework Statement Two metal balls of mass m1 = 2 g (diameter = 2 mm) and m2 = 6 g (diameter = 6 mm) have positive charges of q1 = 2 nC and q2 = 7 nC, respectively. A force holds them in place so that their centers are separated by 8 mm. What will their velocities be after the force is...

Homework Statement An electron orbits a 3.0 cm diameter metal ball 5.0 mm above the surface. The orbital period of the electron is l2.0 micro seconds. What is the charge on the metal ball? r=1.5cm or .015m R=.02m (.015+.005) Orbit=12*10^-6s Homework Equations E=(kq/r)R which gives...

Homework Statement Consider a metal with an BCC crystal structure and atomic weight 92.91. When monochromatic x-radiation having a wavelength of 0.14 nm is used, the angle of diffraction (2*theta) for the (211) set of planes in this metal occurs at 41.148 ° (first-order reflection)...

I have a question regarding the common ring frisbee or regular (nonring) frisbee. I have been thinking of possible ways to "mechanize" the frisbee. I spoke with an engineer and he told me that of all the various possibilities that "combustion" probably has the greatest effect on the...

Hi, I need help with following problem: I need to solve scattering of the planewave incident on the metal wedge. Let's say that wave travels in $z$ direction. Angle of wedge is $\alpha$, it is formed in $x-z$ plane. Wedge is infinite in $y$ direction (metal corner, if $\alpha = \pi / 2$, it will...

What is the reason of Persistent Glowness of Platinum metal after removing it from the flame ?

A steel rod of 0.10kg rests on two metal rails inclined at an angle of 30 degrees. There is a magnetic field of 0.50T on the incline and a current of 70A flowing across the bar. Find the acceleration of the bar. The bar is 0.12m wide** The attempt at a solution What I have so far is a diagram...

Any idea where these space balls came from? Its speculated that several such balls have dropped in southern Africa, Australia and Latin America in the past 20 years.

Metal detectors for searching metals in the ground How they work in one sentence explanation? and second, I've seen some frequency of about 8 kHz mentioned,could that be any possible health risk? Please discuss, thanks.

Of the materials available to the ancient Egyptians for moving large stone blocks, wooden sleds equipped with flat greased metal runners which might ride on parallel wet greased wooden rails gives a low coefficient of friction? It may not be easy to use such materials to make an efficient...

Hi all Why does a molten metal solidify with decrease in temperature. or in other words why is a closed packed structure more stable than an amorphous liquid melt. I have read that the free energy below melting point is lesser for solid state than that of for liquid state at the same...

I have to simulate in Matlab the variation of temperature in a metal plate/block, heated at just one end. One suggestion I received is that I have to use partial differential equations and the energy balance law but I don't know how to start. I study computer science, so physics is a bit off to...

So, I'm drafting out a science fiction being. It's a bipedal, anaerobic, autotrophic sentient being that is almost entirely mechanical and it has no DNA or cellular structure - instead, it's physiology is a maze of gears and metal mechanisms (although they do store information somewhat...

1. Please see the attached problem, essentially a metal ball with charge Q1 is surrounded by a grounded shell q which in turn is surrounded by a further shell with charge Q2 Q1. The first question is what is the charge induced on q by Q1 and Q2 Q2. The second question is how is the charge...

Homework Statement A metal ring of radius a is located in a region with the homogenous magnetic flux density: \hat{B} =\hat{z}B_0 cos(\omega t) The metal ring coincides with the plane z=0. The frequency w is very low. Use Faraday´s Law to determine the electric field where the metal ring...

A metal cube is placed in an empty vessel. When water is filled in the vessel so that the cube is completely immersed in the water, the force on the bottom of the vessel in contact with the cube : Ans: Will remain the same. But how? Won't the force exerted in the second case,i.e when the...

A metal cube is placed in an empty vessel. When water is filled in the vessel so that the cube is completely immersed in the water, the force on the bottom of the vessel in contact with the cube : Ans: Will remain the same. But how? Won't object exert an extra force which will be...

Hi, how to calculate the limit of load you can place on the top of the circular plate with a quite big circular hole in it (OD 10 cm, ID 5 cm)? the question is how to calculate the thickness needed to bear 1 kg which is spread on the whole area (1 kg heavy object with the same shape as the...

Homework Statement An unknown metal with C=3.6 Mass=150g Temp=160c is added to copper container(85g) filled with water(105g) both with an initial temp of 20c I have to find the final temp of water,container and metal Homework Equations none given but I assume it will be E=Cm(t1-t2)...

I am unsure of this matter and so I am curious, do stronger metals more than likely have higher melting/heating points? Does a metal that takes more force/pressure to break or snap have a higher melting/heating point as well? Do metals/alloys like steel or titanium have higher melting points...

When transition metal start losing electrons they lose them from the s orbital before the d orbital. Why is this? The iron(II) ion has 24 electrons in this configuration: [Ar] 3d6 The neutral chromium atom also has 24 electrons, but in this configuration: [Ar] 3d5 4s1 I understand that...

Homework Statement Question no. 4 in this document (there's a helpful picture, too): Homework Equations The Clausius-Clapeyron equation: \frac{\delta p}{\delta \tau}=\frac{l}{\tau ∆v}, where v is the volume per unit mass, i.e., the inverse of the density. The Attempt at a...

I found a lot the the surface plasmon on prism geometry are using gold for metal film, and part of it are using silver. Why we need use gold or sivler as a metal film, is it about the condutivity?

Good Morning, I am working on a project that is designing a water pump for a car engine without any mechanical parts (works on waste heat building pressure to circulate the water). I know that most of the car engine heads are aluminum and that blocks are part cast steel and part aluminum. In...

I was looking at this webpage: http://www.ap.smu.ca/demos/index.php?option=com_content&view=article&id=120&Itemid=85 I was wondering, when n2(imag)=0 what would be the merits of using a metal surface and a glass/air boundary (ie internal reflection in a prism) as a mirror surface? Also...

Dear all, As we know, the work hardening of metallic materials is a result of dislocation movement within the material. But, is there a case in which work hardening is desirable to enhance the plasticity of the metal material? If yes, what's the relationship between plastic deformation and work...

Hi. A metal rod is moving thru a homogeneous magnetic field, standing 90 degrees upon it and the movement direction. Supposedly there is a voltage between the two ends of the rod due to the moving. But why? The magnetic flux doesn't change! I know that the voltage is supposed to be W/Q =...

Will a current through the ptype + metal material be very low because of the ptype material? Does a junction like a pn junction form between the ptype semiconductor and the metal? Thanks for your time.

I am running a project on trying to find a method of detecting splits that are present in pressed metal. The system is to be placed into a manufacturing press line of car panels that will automatically detect and notify when a split has occurred during production. Some methods I have come...

Hello, I was thinking about this and I'm still not sure. I have a long coil (which has uniform magnetic field inside) and a piece of ferromagnetic. Coil is connected to some power source and is positioned perpendicular to surface of the Earth. If I put that piece of ferromagnetic metal...

I have this problem and it's something that's been annoying me all day that I just can't get my head around. Imagine a metal block, in direct thermal contact with a heating element and "the surroundings"; but the heater and "the surroundings" are not in direct thermal contact. (I'm supposing...

Homework Statement Determine the threshold frequency of a metal with a work function of 7V Homework Equations Threshold frequency 'f'=W/h where w=work function, h=planck's constant The Attempt at a Solution This is such an easy question, but I am hung up on how to treat a work...

Homework Statement In a photoelectric effect experiment, 200.0 nm light was applied to a metal surface causing release of electrons. It was determined that a minimum 1.90V opposing electric potential was required to prevent the released electrons from striking the collection electrode. Based...

It is Example 4.5 in Griffiths intro to Electrodynamics. A metal sphere of radius a carries a charge Q. It is surrounded, out to radius b, by linear dielectric material of permittivity epsilon ... He goes on to say that E = P = D = 0 inside the sphere. I understand that D = 0 inside, but...

Homework Statement I'm having trouble understanding charges on Earthed plates I think. I know the answer for this question is that the ball will be attracted to the high voltage plate and stay there but I do not know why is that. Homework Equations A light metal ball is suspended between...

I've read that the atmosphere has a gradient of 100 V/m as altitude increases. My question is, if I suspend a low resistance wire vertically so that each end of the wire resides in a differently charged region of the atmosphere, would a current be produced in this wire?