Metal Definition and 999 Threads

Metal "permeability" I went to the Von Braun planetarium the other day and was surprised to find out that their planetarium dome was a prototype for the Saturn V's Fuel tank! As a result, it wasn't exactly hemi-spherical which threw off come constellations, but that's another story. I...

Comment: "When a metal is heated, there is current (ie flow of e) flowing too" "We all know that metals are good conductors of heat. When one end of the metal is heated, the electrons will rapidly transfer the energy to the other end. This energy transfer often involves the flow of electrons...

Hello everyone, I have a problem and need your help or advice. Kindly check the drawing and help me. Need to know how much force is generated at the free end when the gap closes to 200mm. The length of the plate is 650 where 50 is welded and 600 is the free end Material is...

Homework Statement A metal (doesn't say what metal) is in a heater that is set to 700 K. If the temperature of the ball is 900 K then the rate of heat loss = 0.10 J/min. What is the rate of heat loss when the ball's temperature = 800 K. The ball's emissivity doesn't change appreciably with...

You know how metal shavings form bows of flux lines. How is this possible since there are no discrete flux lines. I would think it should form a 2D gradient of shavings slowly graying out as they get further and further away. But you tend to see discrete lines as if at .4 inches there's a line...

Question We have a bent piece of metal subjected to a shear V; we're to sketch the distribution of shear flow along the leg AB. (see attached) What I've Done So Far I've tried to determine the second moment of inertia but have failed to produce the same results given in the hints...

I am taking Engineering 101, and trying to get the hang of metal structure on a 'grains' level. Ok, so my understanding is this; Metals are polycrystalline materials, that can be divided up into 'grains'. These grains are basically crystals/lattices with a repeating pattern, separated by...

I am making a bonded magnet and have the need to maintain a temperature of around 70 C in a magnetic powder compressed in a stainless steel mold for a period of about 2 hours, before cooling rapidly to room temperature. i was thinking about using some sort of infra red heating, but would like to...

I'm struggling to understand how the stretched rubber & metal ball analogy explains the relativistic conception of gravity. It's possible that there is a simple and obvious solution to my confusion. It's also possible that this question has been answered many times. But I'll go ahead and ask...

Springs deform and basically change shape through atom rearrangement, but I wonder if the actual metal volume changes? Some of the atoms are pulled apart on the outer edges of the spring, while some of the atoms are rammed closer together on the inner portion. The total volume is conserved, or...

Hi Could anyone help me in calculating the force required to deflect a sheet metal part (see attached excel file for details)

Say you detonated a 1 megaton device inside a solid steel ball maybe...1 mile in radius. What would happen?

The temperature distribution on metal plate is given by... Homework Statement The temperature distribution on metal plate is given by T(x,y) = 100/x^2+y^2+1 Calculate the direction derivative in the direction of v= <1,1> at the coordinates (3,2) and at coordinate (3,2) in what...

Hey mates, I have a question that is probably really easy for you but i have no clue? lets say we have a Magnetic field inside a coil. What I want to know is how big do I have to make that field so that the magnetic force will print an aceleration of let's say 1m/s^2 on a a metal bar. I...

Homework Statement Metal X 1) since the graph does not show that V is linearly related with I , is it right for me to apply the formula R(50*C)=R(20*C) (1+ a lΔTl ) to find the temperature coefficient of metal X ? 2) R/Ω is linearly related with T/*C ? If yes, will R=(dR/dT)T+c...

Homework Statement A metal loop is attached to an axle with a handle as shown. The north pole of a magnet is placed blow the loop and handle turned so that the looks rotates counterclockwise at a constant angular speed. Suppose the loop (the one above) were replaced by a second loop that...

I'm trying to formulate an completely liquid metal-based anti-freeze. I was thinking on using Mn, but I'm not sure whether it will stay in an aqueous state After I adding KMnO2 to water to get the Mn in aqueous state. Any help? ::::::::::::::::::::::::::::::::::::::::::::::::: In Love Prys die...

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 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...

[SIZE="4"][FONT="Arial"]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