Aluminum Definition and 303 Threads

Homework Statement There is 100g of water inside of a 50g aluminum calorimeter. After a reaction takes place the temperature of the calorimeter goes from 20 degrees celsius to 25 degrees celsius Find the energy released by this exothermic reaction specific heat capacity of water is 4.18 and...

Hi there So we have a group design project in my mechanical systems 2 class and it basically goes as follows: design a mechanism to cut a half inch aluminum bar in half using a standard hacksaw blade and 4 AA batteries. You have to use a motor w/ input > 5000 rpm for the 'main' component we...

For my physics class we have to show an example of bad physics in a movie. I am doing Mad Max 2: The road Warrior and the scene where the gyro captain crashes his ultralight helicopter but the helicopter is completely undamaged as he drives it later in the movie. I need to know what the force to...

Does anyone know why squirrels gnaw on aluminum?

I install automatic pool covers for a living. The tracks that our cover rides on are composed of extruded anodized aluminum. These tracks come in 22' lengths. Usually there is more than one section of track, set end to end, on a given side of the pool. We drill and anchor these sections to...

Why is it necessary to complete straightening operations prior to completion of natural aging of 2024-T42 material? I believe the controlling specification says to place parts into a freezer to slow down the aging process if you cannot straighten right away. Does this mean that if natural aging...

I have some aluminum pieces for a project that need to fit into some slots, they are about the size of your hand. What would be the best way to coat them so they are no longer conductive? Something thin like an enamel I was thinking but perhaps someone here has a better idea. Thanks in advance!

Hello everyone! I previously opened a thread asking about sound wave energy loss in aluminum discs based on thickness. I am looking to find out more about exactly how much using a disc that is twice the thickness of the other, (one is 1/8" and the other is 1/4") sound energy would be lost using...

Homework Statement Copper and aluminum are being considered for a high‐voltage transmission line that must carry a current of 51.4 A. The resistance per unit length is to be 0.176 Ω/km. Compute the magnitude of the current density for an aluminum cable. Homework Equations R\quad =\quad \frac {...

Working on somewhat of a budget i have the need to shred aluminum sheeting. I have a foundry with a 4 inch crucible and would very much like to shreader the plethora of stock car bodies at my disposal. I'm unsure what Guage the car bodies are but you can fold it by hand. I'll mostly be...

http://imgur.com/Wa8GR7H Hey guys, I just would like to ask simple questions about forces/stress of aluminum bolt to be fastened for connecting aluminum extrusion as shown in diagram above. 1. As shown in the drawing, "A" shows the shear, so what force does B have then? 2. So how would you...

Curie temperature for magnetite is 858 C, for iron 1043 C. Duralumin melting point is about 630 C. Does this mean that if I take a small silicone mold, place a magnet underneath it, add ferromagnetic powder to the mold and then pour molten aluminum in, I will get the aluminum detail with...

Homework Statement What is the diameter of a copper sphere that has the same mass as a 9.00 cm× 9.00 cm× 9.00 cm cube of aluminum? Density of Aluminum = P(al) = 2.70g/cm3 Density of Copper = P(cu) = 8.96 g/cm3 Volume of Aluminum Cube = Vcube = 729 cm3 Homework Equations Volume of a Sphere =...

All the scifi geeks will get this yet again scifi becomes reality http://www.bdcnetwork.com/us-naval-research-lab-develops-transparent-aluminum?eid=223056823&bid=1229250 just a little hint :wink: ...Transparent aluminum ? ... that's the ticket laddie ... it would take year just to figure...

Maximum axial load is proportional to the second moment of area. Thus can we reason that aluminium cans are cylindrical because they have a high second moment of area(mr^2) compared to other shapes(Which gives it a higher max axial load.)?

Is aluminum foil more electrically conductive on the shiny side or the foggier not-so-shiny side?

I am reinforcing a floor that has a 4" crown at the center and supported between 114" ends. The reinforcement material will be a rectangle bar of 6061-T4 Al,35 Ksi, length between ends 114", 1/2" width. How do I calculate the thickness to prevent bending up to 1,500 lb's forced applied at the...

After cleaning aluminum from steel I use with sodium hydroxide, there a brown chalky layer I want to clean off. Other than sanding, I cannot remove it. Is there a way to chemically remove it without affecting the steel?

Does Aluminum , after machining, continue to dimensionally change over time? A large (1000 mm x 500 mm x 300 mm ) aluminum casting is clamped and machined. Various large diameter hole and drilled. Faces are milled. The casting is stress relieved in the normal manner. Next the milled faces are...

From some literature, I read the following band structure of the Al doped Si. The explanation offered: "have vacant acceptor levels at energy Ea above the valence band. Electrons from the top of the valence band can be easily excited into these levels." I thought the above explanation is...

Aluminum foil reels have to be preheated for manufacturing but it's inefficient (the doors aren't sealed and the material isn't in close contact with heating elements at the sides). I'm considering an initiative of more efficient design. How difficult would it be to evaluate heat transfer if...

How can I use aluminum with hydrochloric acid to provide aluminum chloride?

I'm building an frame out of solid 5/8 inch thick aluminum square bars. this frame will be around a fire temps close to melting points but there will be insulation in make sure it won't melt. I was thinking about drilling holes in the free space of the aluminum to reduce it's weight and if you...

Can I make diffusion pumps from aluminum? I am going to create parallel connected diffusion pumps for many UHV purposes. I see that aluminum that is treated to prevent outgassing is used for UHV valves, chambers, and reactors. I'd like to know what temperature diffusion pumps boil their...

I have a few spiral drills that are 3.3 mm diameter and have 2 tiny holes that are supposed to allow coolant to flow through the tool. Unfortunately they got clogged with chips of aluminum. I was wondering if there was a way to dissolve the aluminum out of the holes. I was told muriatic acid...

I need to make a steel beam ( or aluminum) of square tube ( box beam) 10 feet long with a balance point 2 feet from one end. The short end will have 60 lbs on it and the long end will have 30 lbs. how thick of a wall will the square tube need to be to hold the static load?

Homework Statement Iron ball Mass = 0.8 kg, Cp=484, Ti=80 Celsius edit : Cp = 448 Aluminum Bucket = 0.5 kg, Cp=900, Ti=20 Celsius Water = 0.6 kg, Cp=4186, Ti=20 Celsius Ice cube=0.5 Kg, Cp=2090, Lf=3.33e5, Ti=-5 Celsius Find the final temperature of the bucket. Homework Equations Delta Q = 0...

I have to build a new stand for our single compartment concrete laundry tub since two legs of original steel stand are corroded. I want to make the new stand out of angle aluminum to avoid corrosion and also because it's easier to cut and drill. The laundry tub weighs about 135 lbs. I...

Hi all, I'm looking for suggestions on selecting an Aluminum grade which fits the following criteria-- -The cheaper the better! -Medium hard to very hard -Highly machinable (I'd like to see chips, not strings.) -Holds anodize well -Strength is not particularly important I have some ideas, but...

This is a list of ferromagnetic materials that I've found on Wikipedia's category ferromagnetic materials page. I was wondering which of these materials would make possibly great cathodes for aluminum anode in the application of creating an sulfuric solution based acid battery. The battery I...

Homework Statement An aluminum can, with negligible heat capacity, is filled with 150g of water at 0 ∘C and then is brought into thermal contact with a similar can filled with 150g of water at 53∘C. Find the change in entropy of the system if no heat is allowed to exchange with the...

Probably a simple question. I'm looking to soften the 6061-T6 so I can do a crimping / forming operation. My initial thought was to anneal the material and do forming before the aluminum ages back to a T4. I'm not interested in getting the material back to a T6 state for this application...

Hey guys, I'm actually had a hard time in figuring out about our assignment in crystallography of semiconductors, the problem said that, Identify the atomic line lattice axes in a, b,c axis and basal plane diagonal, face plane diagonal, and body plane diagonal of TiO2 and Aluminum Nitride...

I'm aware that it helps keep warm things warm—but does it similarly help keep cool things cool?

Hey everyone. This question revolves around induction/cap sealing - or just induction heating in general. Does anyone have an idea of why aluminum foil is used in induction sealing vs. using something that is magnetic, such as iron foil? My initial thought is simply aluminum foil being...

Hello all, Most engines today in passenger cars are made out of aluminum instead of iron. I am confused about the fact that aluminum is lighter than cast iron and warps easier under extreme temperatures. How do they stop this warping from occurring?

I have an aluminum tube with 1.25" ID and 2.25" OD. I drop a neodymium grade N50 magnet, 1" dia, 2" long into the tube and enjoy watching the magnet drift very slowly down the tube. Lenz's law in demonstration. The paramagnetism of aluminum allows the magnet-in-motion to induce eddy currents...

Hi all, I'm looking to electroplate a copper layer on top of anodized aluminum. Type II (sulfuric acid) was used to anodize the aluminum, and everything looks pretty good so far. However, I saw somewhere on the internet that one can electroplate a copper layer on top of anodized aluminum; how...

Homework Statement Here is the issue I met.Could you refer to attached file? 1.We glued one piece aluminum block and one piece copper tungsten block on substrate. The aluminum and copper tungsten block have different height.The glue thickness underneath them is different...

Homework Statement How many calories are required to raise the temperature of 26 grams of aluminum from 20°C to 115°C? Homework Equations Specific heat of aluminum is 0.22 cal / g x °C Amount of heat = SH x mass x (T2-T1) The Attempt at a Solution Plugging numbers into the 2nd equation...

Homework Statement Imagine that the temperature of 255 g of aluminum sitting in the sum increases from 278 K to 294 K. By how much has its entropy increased? Homework Equations Q=mcΔT ΔS=Q/T The Attempt at a Solution Q=(255 g)(.90 J/gK)(294 K -278 K) Q=3672 J ΔS=Q/T...

I saw on Nova thst large telescope mirrors have aluminum reflective coatings. Wouldn't that rapidly become an aluminum oxide costing? Are the coatings coated to keep oxygen out?

I am performing an experiment for my project. I have bended an aluminum beam of 1in by 1/4 in by 14 in (Al 6061 T6). I deflected the beam upto 0.09 in at the middle. I need to find Sigma x, sigma Y and Shear stress on the expanded and compressed face of the beam which is 1 in by 1/4 in. Can...

I was not expecting there to be a reaction between aluminum metal and a solution of iron chloride. I thought the aluminum would be oxidized and the iron reduced. What is the reaction that is occurring that is creating hydrogen gas on the surface of the aluminum? I know it has to do with...

Hey folks great forum here! Anyone here have a good reference for structural weld analysis technique? I am not looking for code requirements but a general techniques and knockdown factors for aluminum welding. thanks Dan

Magnetic field inside infinitely conductive hollow tube Homework Statement There exists a thin-walled hollow aluminum tube (assume σ=∞) of radius 10 cm centered around the z-axis. A long wire with 5 mm radius has a total current 2 mA in the z-direction and is centered initially at x=-5cm as...

Hello everyone. I was just curious if aluminum foil could block the sun's UVA rays. I have my home office and the sun always gets in and hits me. I know sunlight can cause early photoaging and cancers, so I want to block out as much UVA rays as possible. I do wear sunscreen, but I prefer...

I find it strange that Aluminum is high on the activity series but does not react with evolution of hydrogen with many strong acids. I actually tried this when I was a kid. I had access to any acid or salt I wanted. I tried dissolving Al in H2SO4, HNO3, and HCl with no H2 bubbles. Aqua regia...

I might need to go to a metal shop/fabricator/what have you soon to have work done on a conceptually simple part that has some elements with measurements on the microscopic scale. Think cylinders with a diameter of .2 microns. Lots of them. I would want it done in aluminum. What would be the...

Dear friends I have tried to electroetch 1050 aluminum alloy by 5ml phosphoric acid + 95ml H2o under 1 to 10 volts. However, it was a complete failure even after etching for 6 min. Please help me if you know how to overcome this problem. Thank you very much Best regards