Metal Definition and 999 Threads

Hello friends, I have done some research on the Internet about producing standing waves in a metal rod, and how the various harmonics frequencies are being derived. I have two questions that i wish to discuss here: 1. Is the pattern of standing waves and method of formula derivation the...

Homework Statement Project 7: Identification and Separation of a Metal Chloride and an Organic Substance Here is an open ended lab we have to do for general chemistry: A chemical manufacturing company which produces a variety of specialty chemicals has come across an old waste jar...

2 metal, thin, bars (length=l, mass=m) are hunging on same height (distance between bars-d) Lower end of bars are conected by metal spring (mass=0, k-spring constant, d-length) My problem is how to calculate a normal mode.

The bullet hits near the top of block. Which will tip the block over? Which will do most damage? I believe the rubber will tip it over and the metal will do the most damage...but I'm not sure how to explain it. When the metal hits it enters the block. When the rubber hits there is a...

Homework Statement A thin square (4 ft side) metal sheet of homogeneous density (\sigma = M/Ais rotating around one of its diagonals at 10 rev/s. Develop a definite integral to express its kinetic energy. Homework Equations dK = \frac{1}{2}(r\omega)^{2}\sigma dA The Attempt at a...

Homework Statement Two concentric metal spheres have radii R1 =10cm and R2=10.5cm. The inner sphere has a charge of Q=5 nC spread uniformly over its surface, and the outer sphere has charge −Q spread uniformly over its surface. Calculate the total energy stored in the electric field...

Homework Statement A 100-g piece of metal initially at T = 75oC is submerged in 100 g of water initially at T = 25oC. The specific heat capacity of iron is 0.45 J g-1 °C-1 and the specific heat capacity of water is 4.18 J g-1 °C-1. What is the final temperature of both substances in oC...

I want to take a liquid metal, Aluminum at 700oC and pour it into a steel mold starting at 20oC. For the purpose of the question let’s say that the heat transfer is 100% with no losses to the surroundings. Here are some numbers: Al Mass = 200 g = 0.2 Kg Ti, Al = 700oC Cp = 900 J/Kg-K...

I just noticed that Li is higher on the activity series than K, which is higher than Na. I thought that the activity series was related to the reactions between the group I metals and water, but the series doesn't correspond with the energy produced by the reactions. I'm definitely missing...

Homework Statement Figure 7-29 shows a composite slab with dimensions 22.0 cm multiplied by 13.0 cm multiplied by 2.8 cm. Half of the slab is made of aluminum (density = 2.70 g/cm3) and half of iron (density = 7.85 g/cm3), as shown. How far from the line joining the two metals is the center...

Homework Statement http://img35.imageshack.us/img35/6177/uthw404.jpg Homework Equations The Attempt at a Solution I tried finding the center of mass of the square as if there were no hole in it, and then I added the radius of the circle to the x-coordinate of that. It's wrong...

Homework Statement https://www.physicsforums.com/attachment.php?attachmentid=21003&stc=1&d=1255013927 I need help for number 11(b), (d) The Attempt at a Solution (b)(i) Electrons move towards the right since like charges repel. (ii) Unlike Charges attract. Thus, positive...

Hello! I just registered on these forums and this is my first post here, so hopefully I did everything right. I recently got into metalworking in my spare time, and I am trying to create a metal alloy that will remain liquid at room temperature (a fusible, eutectic alloy). From what I've...

Metal Detectors! Guys I an Undergraduate student in Lancaster University (England) and I have a passion for metal detecting when I am not in UNI. Over the years I have spoke many of my lecturers and research staff about the depth of a metal detector and its soul destroying ability to pick up...

first of all, i not sure whether this question should be posted here. seem the soil is more related to chemistry. :confused: Is Fe the highest concentration in the experiment extraction of heavy metal from organic oxidation phase (OO phase)? If so, why? thanks for helping ya.:smile:

A few questions about electric field here: 1. Why do charges have to be on the outer surface of the conductor? 2. Why no charge on the inner surface of a hollow conductor? 3. If charges cannot be inside the conductor, how come the electric potential is constant throughout the conductor when...

Metal inside a microwave oven --> ice? When I was younger, I placed water inside a tin pan and placed it inside a microwave. I tuned it on, sparks went everywhere and I quickly turned it off. I took the pan out and it was solid ice. How? A while ago I read an article in New Scientist that...

I recently purchased a new microwave oven, and there's a metal rack in it. The salesmen informed me that it shouldn't cause any problems as long as it didn't touch the sides; however, he was unable to tell me why this is. I have a basic understanding of how microwaves(as in the radiation not the...

What is the size of iron pentacarbonyl, methylcyclopentadienyl-manganese-tricarbonyl, or dicobalt octacarbonyl? Where could I find a source on this information? I am aiming to fit the above carbonyls into a 29-34 angstrom pore, but I'd like to know if it's even possible given the size of the...

Homework Statement A small metal sphere, carrying a net charge of q_1 = -2.60 \mu C, is held in a stationary position by insulating supports. A second small metal sphere, with a net charge of q_2 = -7.70 \mu C and mass 1.40 g, is projected toward q_{1}. When the two spheres are 0.800 \rm m...

Homework Statement A Mg-Al alloy has a mass of 0.263 g and a density of 2.40 g/cm3. The density of pure Mg = 1.74 g/cm3 and for pure Al = 2.70 g/cm3. Calculate the % Mg in the alloy.Homework Equations D=M/VThe Attempt at a Solution Well I'm not really sure where to do. I solved for the volume...

Here's an interesting technology I came across: http://en.wikipedia.org/wiki/Alkali-metal_thermal_to_electric_converter So, from this I take it that a means of high-power conversion of nuclear thermal energy to electricity could be achieved. It says it only works upto 1400C, but that seems...

Homework Statement Two metal balls A and B of negligible radius are floating at rest on Space Station Freedom between two metal bulkheads, connected by a taut nonconducting thread of length 1.30 m. Ball A carries charge q, and ball B carries charge 2q. Each ball is 1.66 m away from a bulkhead...

Homework Statement Monochromatic light with a wavelength 415 nm strikes a metal surface. Photoelectrons escape with a kinetic energy of 95 kJ/mol. What is the work function (in kJ/mol, no decimals required) of the metal surface? Homework Equations I have found various equations online...

Homework Statement The speed of sound in a metal rod is 3600 m s -1. The rod is 1.20m long and clamped at one of its ends. (a) Determine the frequency of its vibration if longitudinal waves are established in the rod and it is vibrating in its first overtone mode. (d) Determine the...

There is a metal ball and a metal ring , through which the metal ball can pass easily. But when the metal ball is heated , it can't pass through the metal ring. What will happen if metal ring is heated?(keeping metal ball normal)

I am building a simple capacitor for experimentation and i have a question, or two. At the moment i am using 30cm x 30cm (1 sqft) aluminum plates with a minuscule gap in between them as a capacitor. At the moment, even at the 200micro amp setting on my ammeter I get a very low reading (about...

1. Calculate the density of Na metal. The length of the body-centered cubic unit cell is 4.24 Å.2. Attempted solution: [4 Na Atoms/unit cell] * [1 mol Na atoms/(6.022*10^23 atoms)] * [22.99g Na/1 mol Na] = 1.527 * 10-22 g/unit cell (4.24 Å)3 = 7.6225 * 10-23 cm3/unit cell[1.527 * 10-22 g/unit...

Does anybody happen to know what readily-available metal is the worst electrical conductor?

just wondering if its a sneaky answer or just as simple as put a magnet next to it?

Hi, Could someone give me some basic idea or information 1. How to measure the capacitance of interdigitated metal electrode of about 250 nm wide and 2 mm long on a silicon wafer, spacing between the electrode is 250 nm which is bonded bonded to copper pads. 2. Is it possible to measure the...

i found the average specific heat of a metal through an experiment it is 200. my only problem now is identifying it. i have tried many website but can't find anything useful please make some suggestions

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...

What metal albums are you looking forward to this year?

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...