Metal Definition and 999 Threads

I read a question from a question paper..which went something like this... There is a hollow metal sphere, initially uncharged, put in a uniform field. A field strength E0 is required to break the sphere. If the radius of the sphere is doubled, but the thickness of its walls is not changed...

help Calculus! Homework Statement got this question, and i need help. lost it lol. this is the sort of question i have to do for me assignment. Help in going through it Homework Equations Hot metal storage tank: is rectangle with a square cross section total surface area is...

alright, so here's my question that i have to answer: "A ball of mass .500kg is rolling across a table top with a speed of 5.00 m/s. When the ball reaches the edge of the table, it rolls down a frictionless incline onto the floor 1.00 meter below (without bouncing). What is the speed of the...

1. I need to know which compound out of Copper Sulfate, sodium chloride, potassium iodide and magnesium sulfate will be the best catalyst for the reaction between ALuminum metal and Hydrochloric acid. 2. The chemical equation is : 2Al(s) + 6HCl(aq) -> 2AlCl3(aq) + 3H2(g) 3. I...

Under an influence of a field, the electron distribution can be - Theory A - http://img147.imageshack.us/img147/1690/quantumelectrondistribu.png or Theory B - http://img115.imageshack.us/img115/1690/quantumelectrondistribu.png Theory B can be state wrong cause cause if...

Homework Statement What exactly is the relative problem of extra accumilation of metals such as iron magnese and lead in fish? Do these metals cause problem with fish develoupment and fertility or do they effect the humans or animals that eat them? Homework Equations N/A The...

What´s the main difference between a metal and nonmetal in terms of atomic structure of elements ? :blushing: Thanks.

Metal rod A is 0.300 m long expands by 6.50x10^-4 m when its temperature is increased by 100 degrees Celsius. Another rod made of different metal B and of the same length expands by 3.50x10^-4 m for the same increase in temperature. A third rod C, also 0.300 m long, is made up of pieces of the...

When a 35 gram piece of some metal at 100°C is placed in water, it loses 775 calories of heat while cooling to 30°C. Calculate the specific heat capacity of this metal. Q = mc(DELTA)T T = 70 degrees C m = 35 g Q = 775 cal ?? When i plugged it in i got 0.34 but the program said it...

Hey, I was looking at a car and the dealer told me the battery is at the back in the trunk. When he opened the hood he showed me how I would jump it if needed or anything else. He said there is one rod (that was visible coming through a connection from the battery) for the positive and for the...

"Plating" Metal - Cathode or Anode? Homework Statement You want to plate out nickel from a nickel (II) nitrate solution onto a piece of metal inserted into the solution. Should you use copper or zinc or can you use either of these metals? Homework Equations Standard Reduction...

Problem: The brass bar and the aluminum bar are each attached to an immovable wall. At 21.8 °C the air gap between the rods is 1.33 x 10-3 m. At what temperature will the gap be closed? length of brass is 2.0 meters, aluminum is 1.o meters Why my solution isn't working I'm not entirely...

What difference would you observe about the yield stress, young modulus,etc if your material were a single crystal? Explain the difference.

The thin metal film is scored with some pattern to 50-80% of its thickness. When exerted shear stress, the film will crack/open at score. I wonder what simple/practical techniques can be used to detect its pinhole or opening in real time?

A proton (m=1.67x10^-27 kg) that has a speed of 5.0x10^6 m/s passes through a metal film of thickness 0.010mm and emerges with a speed of 2.0x10^6 m/s. How large an average force opposed its motion through the film?? can anybody give me a clue on where i can start?

I was asked by some of my students (6th grade) why does metal heat up under pressure? For example, when you hammer a piece of metal repeatedly, it is hot to the touch.

Homework Statement "A manufacturer of corrugated metal wants to produce metal roofing panels that are 28 in. wide and 2 in. thick by processing flat metal sheets." the illustration shows that by "2 in. thick" they are referring to the distance between the crest and valley of the sine wave...

Hello. I manufacture a fishing alarm that is activated when 2 very small rods (each about ½ inch long and the diameter of a small paper clip) come into contact. The rods are perpendicular to each other and form an “X” shape. When the rods do touch to complete the circuit, the surface area of the...

A metal alloy consists of magnesium and aluminum.When a 1.00g sample of the alloy is reacted with excess HCl, 0.0989g of hydrogen gas forms. Calculate the percent composition of the alloy. Ok I got the following balanced equations : Mg + 2HCl -> MgCl2 + H2 2Al + 6Hcl -> 2AlCl3 + 3H2...

Could someone help by recommending hardware to mount a prototype board like this: http://www.protostack.com/index.php?main_page=product_info&cPath=1_2&products_id=3 to a metal box? I was planning on drilling some holes in the metal box, then somehow mounting the prototype board(s) using...

Identifying three identical metal bars (with your eyes closed!) Homework Statement How would you determine, non-destructively, and with eyes closed, which is which amongst three identically-shaped metal bars known to consist of a permanent magnet, a piece of soft iron and a piece of copper...

First, there is a positive point charge sitting in space which creates an electric field around it. Then, a large metal sphere with no net charge is a added some distance to the left of it. Does the addition of this sphere change the magnitude of the electric field at some points a and b which...

I stumbled on this question while studying sound waves today, and it has got me stumped. I've been thinking this through for hours, to no avail. It goes: A park has a circular fence with a metal pipe as the top rail. If the fence is hit with a hammer it produces a sound of 350 Hz. At a point...

Is there any research done on plastic engine blocks or cannon barrels ? I interested in using plastics at high heat high pressure environments after learning some researchers cools 1600 degree plate to 80 degrees with potassium or sodium or exotic metallic liquids. I think it might be possible...

Three tiny charged metal balls are arranged on a straight line. The middle ball is positively charged and the two outside balls are negatively charged. The two outside balls are separated by 20 cm and the middle ball is exactly halfway in between.The absolute value of the charge on each ball is...

Metal and wood common temperature for neutral "feel" Homework Statement Taken from the homework: At what common temperature will a block of wood and a block of metal both feel neither hot nor cold to the touch. Homework Equations I believe it is just conceptual, so I do not know if one...

Hi all, Currently I am in my internship, so I don't have any real experience in metal manufacturing. I have a difficulty of calculating the cycle time of producing a product. The product is a waterpipe fitting. The Fitting itself has 3 different types (Straight, 90-degrees elbow, and...

hi you'al, i hang in a knife forum and there is a lot of discussion on what steel is "best" for knife blades..latest fad/dream steel is some power made to steel from Hitachi some of what i wander is the "powder" made no for these steels and what adds to the properties of the steel the...

voltage/charge problem Homework Statement Imagine a small metal sphere left by some alien civilization is floating in space. A probe is launched directly at the sphere in order to study it. When the probe is 1000 m from the sphere, it detects a voltage of 110.0 V; and when it’s at 100.0 m...

I'm looking to assemble two sheet metal parts (in the manner a bit like joining two halves of a box) in a simple manner that is either crimpable or some sort of snap fit. I have not seen any snap fit sheet metal designs and I wonder if there is any sort of standard practice (the aluminum sheet...

Homework Statement One end of an insulated metal rod is maintained at 100^\circ C and the other end is maintained at 0.00 ^\circ {\rm C} by an ice–water mixture. The rod has a length of 75.0 cm and a cross-sectional area of 1.40 cm^2. The heat conducted by the rod melts a mass of 7.85 g of...

Homework Statement A metal bar of mass m slides frictionlessly on two parallel conducting rails a distance l apart. A resistor R is connected across the rails and a uniform magnetic field B , pointing into the page , fills the entire region. a) If the bar moves to the right at speed v, what...

What is the main reason for changing the strength of metals under very high strain rate? Do all metals show the similar trend in increased strength under high strain rate? What is the effect of crystal structure on this phenomenon?:!)

What would happen? Why

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...

Homework Statement Given is a metal plate with two metal bolts attached to it, the attachement is assumed to be idealy conducting. A current I flows between the two bolts. Find a general formula for the Resistance between the two bolts (depending upon: a) the thickness of the plate (delta)...

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.