Iron Definition and 517 Threads

Iron Age coins discovered in Jersey after 30-year search http://www.guardian.co.uk/culture/2012/jun/26/iron-age-coins-discovered-jersey About 50,000 silver and bronze coins uncovered by men who spent decades exploring one field...

i want to make this as i ve to give this solution with the oral root to the rats , can anyone help me

I was recently asked why the iron in our blood wasn't killing us while iron is poisonous to the body; and what would be if it was other metals than iron in our blood, what would happen?

I'm looking at iron contamination on silicon and I'm wondering if, at high temperature (1400 K), and in a hydrogen atmosphere, should I expect some iron to change to gas phase?

I have heard that iron is quite special in that no matter how much temp. and pressure is present, it will not change to a molecule of greater atomic number. I keep wondering about the geometry of the arrangement of protons and neutrons in the iron atoms' nucleus that could account for this...

If an aluminium disk is placed above a COMPLETELY vertical current carrying iron rod will any flux link with the aluminium disk... Firstly, does it matter if the current is AC or DC. I presumed not as the only difference is that the magnetic field will vary in one case and stay constant in...

in terms of what buying what is the dereference between hard and soft iron? i know an iron core is good but what about cast iron?

This is way outside my area. I have a 4" long 1/2" D. rod of 6/6 nylon, inside a mild steel tube. The application is all-weather. Length of rod travel is .70 to .75 inch. Light use, 20-50 actions per day. The application is an oddball latch release lever. Nylon was chosen because of cost...

Homework Statement You come into lab one day and find a well insulated 2000mL thermos bottle containing 500mL of boiling liquid nitrogen. The remainder of the thermos has nitrogen gas at a pressure of 1.0atm. The gas and liquid are in thermal equilibrium. While waiting for lab to start, you...

Hi, I had been thinking and could not able find any answer myself. Actually, if two materials like copper or bronze(especially considerting electrode materials in seam weld design). If the electrodes are spnning on to a work sheet for weld, obviously heat would produce in the action. is...

Homework Statement Does anyone know whether Iron Bacteria can be found in seawater or not? Homework Equations The Attempt at a Solution

Homework Statement When bending iron nails, the corrosion rate increases. Does anyone knows, why is that? Homework Equations The Attempt at a Solution

I have a bit of basic knowledge on rusting and corrosion of iron but I am trying to find ways to stop rusting. The problem is what if an object was already submerged in water? Is it still possible to stop it from rusting? I know there are 3 ways of preventing corrosion but I am not sure if there...

If you were to mate a 1 ½” black iron pipe to a 1 ¼” black iron pipe using a 1 ½” coupling and a bushing reducer, how much bending torque would be needed before one of the parts or connections failed? That is, if you held the 1 ½” black iron pipe in a fixed position and the applied a force to...

A brass plug is to be placed in a ring made of iron. At 10°C, the diameter of the plug is 8.731 cm and that of the inside of the ring is 8.719 cm. a) They must both be brought to what common temperature in order to fit? b) What if the plug were iron and the ring brass? formula for...

I've just watched the Extreme Stars program in How the Universe Works and it states that when a massive star starts to make iron, the fusion is quenched and the core collapses. From the program, it sounds like the process is fast and will happen when a few grams of iron is formed. I find this...

The Marvel Avenger's Movie is coming out in a month's time. While many superheroes like the Hulk and Spiderman require much more biological research to come true, superheroes like Iron Man, Batman, Black Widow rely on engineering technology. Which of our current-day technology has the...

Homework Statement A soft iron ball is fixed a distance d above the pole of a rectangular dipole magnet which is permanently magnetized. What is the force the iron ball feels due to the magnetic field? The dimensions of the dipole magnet are a x a x b, where a < b Homework Equations...

The inductor is initially an air cored one.When the Iron core is introduced,the resistance is found to increase considerably.Please explain.

Homework Statement Cast iron has a strength in compression of about three to four times the strength in tension, depending upon the grade. using the stress as a prime consideration, design the optimum T section for a cast iron beam using a uniform section thickness such that the compressive...

Hey all, I'm a complete layman at all things magnetic, and lately I've been trying to understand how the Earth's geodynamo works. From my understanding of Wikipedia and this site (http://es.ucsc.edu/~glatz/geodynamo.html), the fundamental thing that actually generates magnetic field is:---...

Homework Statement A 100g of hot iron rivets is heated to some temperature and then quickly transferred to 120g of water at 40°C in a copper calorimeter of mass 50g and specific heat capacity of 400J/(kg.°C).It is found that the final temperature of the mixture is 100°C and the water has...

Hi guys, I bought a soldering iron the other day and I was doing some soldering for quite a while (It was one maybe 10-15 mins) and then the metal before the tip started to turn black and smoke was coming out of it, Is there anyway to prevent this as let's face it, it's a lot less than ideal...

Hi all, i have ordered a 30W/230V soldering iron for doing some hobby projects online. First instance when i tried to use soldering iron i found the time it took to get heated up was very huge, some how i managed. After some several uses now when i am trying to use it is not getting heated. I...

What happens? I think nothing should happen since the rods will not get magnetised at all due to the ac current.. Thanks for the help!

Hi when a good former explained a theory, I didn't understand this very well. So I'll check it out again. Sorry for the many posts my me and thanks! When a magnet is placed vertically to an iron wall it gets attracted.(meaning the north and south poles are in contact with the iron wall)...

I've extracted more than 50 grams of iron from the clay under the grass on my lawn, just to see if I could do it here in the Maryland suburbs of Washington, D.C. That was a few years ago, but now I'm thinking about how to purify it. You can see an iron ring I made at...

Homework Statement You cool a 100g slug of red-hot iron (temperature 745 degrees C) by dropping it into an insulated cup of negligible mass containing 85g of water at 20 degrees C. Assuming no heat exchange with the surroundings, what is the final temperature of the water? Homework...

A fellow on a Jeeping forum contends that axle shafts used in Jeep CJ Dana 30 front axles are made of ductile iron. I say they are made of a forged carbon steel similar in composition to 1040 or 1050 which I understand is commonly used in OEM axle shafts. Is it possible for ductile iron to...

I want to see what type of impacts a certain suit, say for example, an iron man suit, can handle with different materials. for example, what would happen if you where to make it out of iron compared to titanium or nitinal, what would happen if you shot it with a 9mm or even 105mm tank cannon...

Hi everyone. I have a simple doubt related to magnetism and inspired by the Bollywood movie 'ROBOT' staring Rajnikant. In the spectacular chase scene where Chitti(the robot) is trapped on a bridge with Aishwarya Rai( the heroine of the movie) and are surrounded by multitudes of policemen, he...

Homework Statement A wire Loop R with a current I=10A running through it, is distance d above an infinite plane of iron with mu=5mu_0 R=2d. Find the force on the loop Homework Equations I would assume you could use image currents in the plane of iron to solve this The Attempt at a...

"However, [Thatcher] was never, in my experience, the half-hysterical, over-emotional, over-acting woman portrayed by Meryl Streep." - Norman Tebbit, who served in Thatcher's Cabinet...

This is kinda related to my other thread, but I thought I'll make another one. So, can you magnetise an iron sheet with an electromagnet? Does the electromagnet have to be touching the iron sheet or can it just be near it? Does the thickness of the sheet metal affect its magnetic field...

So I had a lab where we are supposed to determine the amount of iron present in a vitamin. I have a calibration curve already constructed, and it is telling me that the concentration of the iron is about 3.20 ppm. The vitamin was boiled with acid, filtered, and diluted to 100mL. Then...

Homework Statement Hi. I just did a lab where we are to determine the amount of iron present in a vitamin based on its absorbance (after reacting it with hydroquinon and o-phenanthroline) and I am having trouble making a conversion. At the beginning of lab, we prepared a " .04 mg/mL = 40 ppm...

"filters for Co K radiation are usually made of iron oxide power. If a filter contains 5 mg Fe2O3, what is the transmission factor for the Co K(alpa) line? What is the intensity ratio of Co K(alpha) to Co K(beta) in the filtered beam?" I was wondering if you could expand further as I'm stuck...

Homework Statement I'm having trouble with this. I need to calculate the number of atoms in iron. How do I do this? For example if I had 1 KG of iron, how many atoms are in it? Homework Equations I need to give an answer in scientific notation A x 10^B A being 1 significant...

Which Acid is Best for Cleaning Rusty Iron ? Hi, What is the best acid/solution which can clean the rusty surface of Iron metal...? Is Nitric acid good enough? or hydrofluoric Acid? Thanks in advance...

If you drop an iron nail into water it sinks. But a ship made up of iron floats in water. Please explain this to me.

I need to know how to find the normal approximation of B for cast iron from the B-H curve. I know for sheet steel, I can use a B of 1 and get 400 for H and use B=μH to get 0.0025 Wb/At-m. How is it done for cast iron?

Can some one give me ideas that how can we do above question.

Homework Statement You have an iron ring, hung near a solenoid which has an iron core inserted within. [PLAIN]http://img843.imageshack.us/img843/1623/imgsole.jpg Below are the questions and answers my book provided. I highly suspect the reasoning and i seek PF members to evaluate how true it...

Say I use the Biot Savart law to calculate the magnetic field strength at a single point somewhere inside solenoid. I record this value. Then I add an iron sphere to the inside my solenoid very close to but not touching the point just calcuated. If I were to recalcuate the field strength at this...

In Cosmos, Sagan explains to us laymen that stars fuse hydrogen into helium, and then if a star is big enough it creates higher order elements in later stages, before going supernova. What isn't explained is why such a high proportion of heavier elements (heavy relative to hydrogen) collect to...

Homework Statement How many Fe atoms and how many moles of Fe atoms are in 400.0 g of iron? The Attempt at a Solution Ok. i attempted to find the number of moles by using 400/55.8 to get 7.17 but that is wrong?! please tell me ehy this is wrong. i set up a proportion like this...

Homework Statement Consider a simple model for the interior of the Earth: there is a spherical iron core with constant mass density ρ0 and radius a; outside the core is "rock" with constant density ρ1. Use these values for the densities: ρ0= 8.90×103 kg/m3 and ρ1= 3.80×103 kg/m3. The radius...

How Iron is poison for a star. I have not read this thing in my course book. Today I was watching Discovery channel. there was a show on stars which describe this. I think this is related to binding energy per nucleon of Iron which is highest of all.(I am not sure it is just an Idea)

3.2kg of iron is required to make a hollow spherical shell having inner radius (r=3cm).outer radius(r=5cm). i)estimate density of iron. (ans :6.585g/cm^3) -not sure if its correct though ii) using (i),est interatomic spacing of the iron atoms. the atomic mass of iron is 55.9u. need help...

Hii , i am new in this forum . I am in class 10th and my name is Sankalp . I have a question : Can you tell me why copper is better conductor of heat than iron ??