Metal Definition and 999 Threads

Homework Statement Two small metal spheres with masses 2.0g and 4.0g are tied together by a 5.4-cm-long massless string and are at rest on a frictionless surface. Each is charged to +2.1 μC . The string is cut. What is the speed of each sphere when they are far apart? Homework Equations...

Homework Statement I'm trying to determine R_0 and alpha (temperature coefficient of resistance) from results I obtained through an experiment. We have been given the first equation and been told that R_T is the resistance at temperature T in kelvin. R_273 is the resistance at temperature 273K...

Hello! A co-worker recently asked me how to calculate the maximum current through a titanium cylinder. I immediately realized there were probably many variables, likely including voltage, length, cross sectional area, and electrical conductivity. I used wikipedia to see what I could find and...

Homework Statement The picture for my question is attached. I labeled on the picture, which is a metal object, where I thought the distribution of charges on the surface would be if it has a net negative charge and the electric field lines near the surface. At what point on this object...

Homework Statement In the following diagram, the brown metallic conductor rod is given a slight push to the left. The black lines are all conducting wires, with the entire setup placed in a perpendicular B-field. Ignore friction. What will happen? 1) The rod slowly come to a stop? 2) The rod...

As i know, the metallic structure for example a pure copper metal which is made up of all metal atoms that is the copper atoms actually have all its atom of metallic element bonded together by metallic bonding. Metallic bonding is the electrostatic force of attraction between the positively...

Homework Statement A 100.0 g copper sample (specific heat 0.385 J/g K) at 100 C is added to 50.0 g of water at 26.5 C. What is the final temperature of the copper-water mixture? Homework Equations q = q(copper) + q(water) q = (heat capacity)(change in Temp.) q = (specific...

I'm having some difficulty applying Gauss's Law to metal plates. From what I've studied it seems to me that Gauss's Law only really works when there is spherical symmetry, in all other cases it is an approximation. Am I correct in inferring this? However, in a case where the distance between...

Or is 'semiconductor' more specific, referring to only some transition metals? After looking up the etymology*, I guess that a hypothetical material besides the transition elements which had properties which met the definition of 'semiconductor' would qualify; but that doesn't completely...

Is my understanding correct that the short term stability of fast neutron liquid metal cooled reactors is based primarily on the thermal expansion of the core, while the Doppler coefficient is far less significant factor, as the Doppler coefficient primarily affects the low energy neutrons? (The...

Can Carbon displace Aluminium, Silver and Gold from their oxides ? Also where is Carbon found in the reactivity series ? Edit : Got confirmation of Carbon's position in the reactivity series. But I still have a doubt about Silver and Gold because they are unreactive.

As a semi conductor approaches absolute zero there should be zero conductivity, the thermal energy that electrons acquire is or can be responsible for promoting electrons from the valence band to the conduction band to provide current flow in a semi conductor ( for t>0). My question is...

I understand that the frequency of the sound produced when hitting a metal rod will change as you hold different parts of the rod to increase or decrease the length of it. However, what puzzles me is whether the frequency will change if you keep the position of your hand constant while hitting...

A metal plate is connected by a conductor to a ground through a switch. The switch is initially closed. A charge of +Q is brought close to the plate without touching it, and then the switch is opened. After the switch is opened, the charge +Q is removed. What is the charge on the plate then...

I'm doing a story for our paper on this outdoor must be mercury or metal halide light that's been burning constantly at least since 1996. So says the owner who took over the property then. He says the photo switch isn't working so it never shuts down. And-there are two others nearby with good...

I was at this japanese tepenaki places or however you spell it where they make the food in front of you and my dad had an interesting though. The stations they have have these big flat cooking areas powered underneath by what I assume were a bunch of gas burners. We bought a new bbq and my...

a sample of metal weighs 210 g in air, 180 g in water and 120 g in an unknown liquid. then the density of metal is.

Metal nanoparticles (Au, Ag, Al or ...) can coat on porous silicon, the particles can be located inside the pores or on the silicon micro/nano structures. By applying this type of coating is there any change in band structure of porous silicon? As I've measured the band gap has changed.

It is cylindrical in shape and is solid (not hollow) and has uniform density. Igonre air resistance. It spins with some angular velocity omega and spins in the other possible ways. Apart from omega, how many more degrees of freedom is possible? I can find the MOI of a rod spinning with...

Homework Statement Vapor density of a metal chloride is 66. Its oxide contains 53% metal. The atomic weight of the metal is ? Homework Equations vapor density = 0.5 * molar mass The Attempt at a Solution Using the above formula, I found the molar mass of the metal chloride as...

A metal rod and a metal ball more submerged in h2o, such that one end of the rod is adjacent to the ball. if the h2o will be heated from 30 k to 65 k, what is the acceleration of the ball? the initial length of the rod is 6 m. Vball= 6 cm3 Vrod= 9 cm3 Crod= 13 cal/g.c degrees Cball= 8 cal/g.c...

hello, I've got an idea for a project but I'd need to know if there's some kind of metal (it would be great if it was a common/affordable one, not very rare/expensive) that heats rather quickly with sunlighth (like iron) but when it gets at a temperature (say, 100ºC) doesn't continue heating...

Hey guys. A friend and I are planning on making a scuba diver tow device for his trip to the florida keys. We could just put a trolling motor exposed to the water, but at depth I have reason to believe water would push past the seal. So what we are hoping to do is weld up a thin wall steel...

Homework Statement A circular metal ring, as shown on the diagram below, is constructed so as to expand or contract freely. In a region with a constant magnetic field Bo oriented perpendicular to it, the ring expands, with its radius growing with time as r=r0(1+\alphat2). As the ring expands...

I am working on a project, all details can be found http://www.overclockers.com/forums/showthread.php?t=680115" is the catalog page with the options. I've googled about annealed and "dead soft" however I still can't tell exactly how soft/flexible it is. All I need it to support is water running...

hello! My first post here. I am by no means a mechanical engineer as I studied computer science in college. My question has to do with adding what is known as a cold air intake onto my vehicle. The design of the intake is such that the pipe fits at the throttle body via a silicone/rubber...

Homework Statement the latent heat of fusion for this metal is 500Cal/kg. The latent heat of vaporization is 600Cal/kg and specific heat of the liquid metal is 500C/kg K. How much heat is needed to melt an 8kg block of this metal when its temperature is exactly at the melting point...

I have a small physics book that states that if you run electricity throught a magnet it will repel metal. I just want to know if this is true.

When energizing a solenoid, why does an iron object travel along the axis of the solenoid?... and why does it typically get sucked inward no matter the polarity of the solenoid windings? This is a similar question: Why do relays work with both polarities? How does energizing the coil cause...

reflection in a hollow metal waveguide... Hello Forum, when an electromagnetic wave hits a conducting surface there are surface currents generated on the surface itself. These currents are the result of the interaction between the field and the metal. Do these currents radiate their own...

Ok, so one problem with space is that bones lose mass, making them weak. Could one way around this (and osteoperosis on Earth) be to graft somekind of metal plating onto the bone structure to reinforce it in some way?

I'm doing a physics project on microwave ovens. I've been researching online and some sites say that you can place metal in microwave ovens because nothing will happen, and some say that you can't because metal reflects microwaves. I'm curious as to what the correct answer is and why. Thanks!

Hey all! I've return back to my year 12 assignment, the railgun. I got a working model back then, but unfortunately didn't write up a good report. I have the videos on youtube if anyone is interested. The reason for the conductive liquids is because I want to tackle the arcing issue. I...

Hello, I'm a junior engineer, and I'm facing a physics/maths problem, for my new project. I don't know all the technologies at the moment, and don't know all the tools available. I would like to calculate/get the closest Metal object from an other object (called x). x could store a sensor or...

I came across a couple of cow magnets a while back. When you drop a cow magnet down the center of a vertical piece of steel conduit, it doesn't drop as fast as it usually would. When you drop a cow magnet down the center of a vertical copper plumbing pipe (closer fitting than the conduit)...

Hello, I'm a junior engineer, and I'm facing a physics/maths problem, for my new project. I don't know all the technologies at the moment, and don't know all the tools available. I would like to calculate/get the closest Metal object from an other object (called x). x could store a sensor or a...

Can electric fields can be completely shielded using a metal box or metal sphere, please clarify the concept.

I saw an exam question that ask the students to explain the process of electoplate barium onto a piece of copper rod Can some body help me to explain why is it not possible?

Homework Statement Dear All, I am having problems understanding how to deal with related rates. The problem is the following: A solid 400gm metal cube of size length 10cm expands uniformly when heated. If the length of its side expand at 0.5cm(hr), find the rate at which, after 5...

I wanted to make tiny movements of the Earth visible by reflecting laser light off liquid gallium metal. It did produce nice reflections on my wall, showing dramatic wobbles of very tiny movements of the liquid gallium. It did however produce light interference patterns which I cannot explain...

For my a levels, I think I need to know the colours of each oxidation state of the transition metals, from scandium to zinc. Is there any easy way to remember each one?

Homework Statement The specific heat capacity per unit volume is denoted CV.Sketch Cv/T as a function of temperature T,in the limit T goes to zero, for both an ionic solid ,and a metal.Why do curves differ ? Homework Equations The question is very specific ,and in these cases as you know...

There are lots of for metal cutting measurement. However, thermocouple is not in the list of metal cutting measurement. Anyway, is it possible to measure the temperature for turning machine by using K-type thermocouple. Can i put the thermocouple at the end of cutting edge to measure ? can it...

From what I know, different metal ions produce different colours. This is due to the fact that electrons jump to the next energy level when energy is absorbed but then released some of that energy back, producing different wavelengths and thus different colours. What I want to know is...

When Metals (specifically Magnesium) oxidise within water would this increase or decrease the accidity of the water around it?

I am working on a pilot project to recover gold from circuit boards. I have tried several methods and am interested in giving iodine a try. I know it will dissolve the gold but I cannot find an answer on how to get the iodine solution to drop the gold. Any ideas? Thanks.

Homework Statement Two horizontal metal plates are 1cm apart in air. An oil drop bearing a charge of one electronic unit is balanced between the plates when the potential difference between them is 800volts. Find the mass of the drop. Homework Equations I may need to use some...

Homework Statement How can you calculate the specific heat capacity of an unknown metal? In my question the metal with a mass of 50g and a temperature of 200 degrees celsius was placed in 125 g of water with an initial temperature of 20 degrees celsius. After the simulation and the metal...

Hi, I wonder if anyone can help me with a personal research project. Besides being an educator I am also a motorcycle aficionado. I enjoy the deep rumble of a Harley Davidson motor. I own three Sportsters. My goal is to give my "small" Harley's the deep rumble of their bigger siblings. To this...