Aluminum Definition and 303 Threads

I'm having difficulty with a problem on MasteringPhysics (such wonderful software...) and as a last resort I'm posting on here. This is, I'm sure, a really simple problem but I'm getting no kind of feedback from MP and there isn't an example problem like this in the book. The Problem Two...

1. Homework Statement My cousin James asked me for help on this question and I was stumped. There is an aluminum half ring that's inside radius is 1.8cm and outer radius is 2.3 cm. It has a thickness of 4.5mm and is at 20 degrees. The left side is at 47.5 microvolts and the right end is at 0...

Homework Statement My cousin James asked me for help on this question and I was stumped. There is an aluminum half ring that's inside radius is 1.8cm and outer radius is 2.3 cm. It has a thickness of 4.5mm and is at 20 degrees. The left side is at 47.5 microvolts and the right end is at 0...

Does anyone know a good method of producing Aluminum Chloride in liquid form? I need to prepare a 25% Aluminum Chloride Solution for my presentation. Any help would be greatly appreciated.

How would one go about distingushing between magnesium alloys and aluminum alloys (physical characteristics)?

Periodically, I receive useful information on materials. This short note was sent from ASM. Two most common methods to increase the strength of aluminum alloys are to: Disperse second-phase constituents or elements in solid solution and cold work the alloy (non heat treatable alloys)...

A 2.65g aluminum bullet at 31.4°C is fired at a speed of 209 m/s into a large block of ice at 0°C, in which it embeds itself. What quantity of ice melts? Q=(9.00E2)(.00265)(31.4)=74.889J 74.889J=m(33.5E4)=2.23E-4kg so i get a final answer of 2.23E-4kg but its wrong. i think I am either...

"Pellets made out of aluminum and gallium can produce pure hydrogen when water is poured on them, offering a possible alternative to gasoline-powered engines, U.S. scientists say." continued... http://news.yahoo.com/s/nm/20070518/us_nm/fuel_hydrogen_dc

A cylindrical aluminum pipe of length 1.36 m has an inner radius of 1.80 10-3 m and an outer radius of 3.00 10-3 m. The interior of the pipe is completely filled with copper. What is the resistance of this unit? (Hint: Imagine that the pipe is connected between the terminals of a battery and...

I have noticed that the mechanical properties of aluminum vary depending on if it is provided as sheets or extrusion. Do you know why?

I'm wondering if anyone is willing to share some comparison numbers between any aluminum's hardness value and its impact resistance value. A friend and I are disagreeing on something, I think the harder the treatment is, the more brittle it becomes. He doesn't think so.

Homework Statement A man strikes a long aluminum rod at one end. Another man, at the other end with his ear close to the rod, hears the sound of the blow twice (once through the air and once through the rod), with a 332ms interval between them. How long is rod? Homework Equations...

A 0.4 kilogram sample of Aluminum at 115 degrees Celsius is put into a container containing 0.5 kilograms of water at 15 degrees Celsius. Neglecting the small amount of energy absorbed by the container and knowing that the specific heat of Aluminum is 900 kJ/kg*C, and the specific heat of the...

I'm having extreme difficulty identifying some precipitates I obtained from combining a solution of Aluminum Nitrate and Sodium Carbonate. The result was an orange precipitate. I have searched high and low (complex ions, decomposition, redox, etc) but I can't figure it out. Please HELP!

I had this posted in the wrong forum...srry :blushing: I need to contact who ever would be authority on propeller design and applications. In short, the Idea is to build a Aluminum prop, 1.2 meters diameter with weight of about 1000 grams. Targeted application would be primarily for...

I need to contact who ever would be authority on propeller design and applications. In short, the Idea is to build a Aluminum prop, 1.2 meters diameter with weight of about 1000 grams. Targeted application would be primarily for powered para gliders. I need some arguments for and against...

I am trying to determine some general cantilever equations. I have an aluminum beam extending out 235 mm (L) from an aluminum block. The beam is 25 mm wide (W) and 3 mm thick (H). A force is applied at a point approx. 200 mm from the block and I am interested at a point 25 mm away from the...

Homework Statement In an experiment, 240 g of aluminum (with a specific heat of 900 J/kgK) at 100°C is mixed with 40.0 g of water (4186 J/kgK) at 20°C, with the mixture thermally isolated. a: What is the equilibrium temp in C? b: What is the entropy change of aluminum? c: What is the...

Help explain to me the understandings behind running an iron flywheel compared to an aluminum flywheel (or vice versa) in a street car and or drag car. An iron flywheel (21lbs for example) will help a car get off the line better from a launch compared to a lighter flywheel (11lbs for example)...

"An aluminum calorimeter with a mass of 100g contains 250g of water. The calorimeter and water are in thermal equilibrium at 10.0Degree C. Two metalic blocks are placed into the water. One is a 50g piece of copper at 80.0 degree C. The other block has a mass of 70.0g and is origionally at a...

An aluminum cylinder weighs 1.01 N. When this same cylinder is completely submerged in alcohol, the volume of the displaced alcohol is 3.88 × 10-5 m3. The apparent weight of the cylinder when completely submerged is 0.778 N. What is the specific gravity of the alcohol? m=W/g...

I have a sheet of aluminum that has a mass of 0.69g, length of 10.2cm and width of 7.5cm. I need to find the volume in cm3 and the thickness in cm. What is the formula to do this? The density of aluminum is 2.699 g/cm3...do I need to use that in the formula or is that irrelevant when calculating...

During the heat treatment of Aluminum alloys, two processes: Solution and Precipitation heat treatment were used. Should the hardness increase or decrease from the original alloy after solution heat treatment? My reference text says that the material should be "soft and ductile" after...

During the heat treatment of Aluminum alloys, two processes: Solution and Precipitation heat treatment were used. Should the hardness increase or decrease from the original alloy after solution heat treatment? My reference text says that the material should be "soft and ductile" after...

Hi, I have some questions about using Aluminum as a rocket fuel with oxygen. According to my calculuations, V_ex = sqrt(2*Ed) where V_ex = exaust velocity at 100% efficiency and Ed = energy density of the propellant in J/kg. This is proportional to sqrt(T/m_w) where T is temperature and m_w is...

There was a period in the 80's when I used to notice whether someone had alumininum or wooden screen doors every time I drove past their house. In fact, I almost looked down my nose at such people and thought they were no better than pond scum (just kidding). I was going through a snooty stage...

An aluminum ring of radius 5 cm and resistance 0.003 ohms is placed around the center of a long air-core solenoid with 1000 turns per meter and a smaller radius of 3 cm. If the current in the solenoid is increasing at a constant rate of 270 A/s, what is the induced current in the ring? B=...

hello there about wat temp does ,Iron oxide, aluminum, baking soda, table salt melt? degress F please. and about how hot does a US conventional gas stove get? thanks. and aluminum foil is pure aluminum right?

I have almost my entire worksheet done but I wanted to check my answers and get some help with the final question.:smile: What is the mass of one mole of aluminum? The mass of one mole of aluminum is 26.981 grams. What is the mass of one mole of hydrogen? 1.008 g What is the...

An aluminum tube with an outside diameter of 1,000 in. will be used to support a 10-kip load. If the axial stress in the member must be limited to 30 ksi T or C, determine the wall thickness required for the tube. I used tau=shearing stress/area therefore 30(pie times 1-d)=10 but that is not...

I have a 6063 aluminun tube with a fiberglass/epoxy outer wrap. Is there an reasonably fast and effective way to chemically dissolve the aluminum tube, without seriously degrading the fiberglass outer shell? Appreciate any suggestions.

Question 1: A hole in an aluminum plate has a diameter or 1.178 cm at 23.00 degrees Celsius. (A) What is the diameter of the hole at 199.0 degrees Celsius? (B) What temperature is the diameter of the hole equal to 1.176 cm? For (A) I used the equation Change in Area = 2 * alpha * A *...

"A piece of aluminum (specific heat 910 J/kg-C) of mass 200g at 80.0 deg Celcius is dropped into a styrofoam cup filled with 100mL of water at 20.0 deg C. What are the final temperatures of the water and the aluminum?" This is what I got: I figured out the amount of heat energy transferred...

A steel sphere sits on top of an aluminum ring. The steel sphere (a (average coefficient of linear expansion) = 1.1*10^-5/C) has a diameter of 4 cm at 0 C. The aluminum ring (a = 2.4*10^-5/C) has an inside diameter of 3.9940 cm at 0 C. Closest to which temperature given will the sphere...

if used aluminum as my anode, and graphite or any other metal as my cathode. could i run a low amp current through salt water and make alminum chloride (or any other alminum product)? in other words how quickly and is it possible to produce any aluminum products with electrolysis? i was just...

Not sure if this should be here or in materials... So I am attempting to braze 2 flat pieces of aluminum I apply a copious amount of flux I believe I am heating teh metals thoroughly my braze is not flowing into any of the joints ever i have tried numerous times once I even ended up...

"2 rods of equal length (0.45m) and diameter (1.5cm) are placed end to end. one rod is aluminium, the other is brass. if a compressive force of 8400N is applied to the rods, how much does their combined length decrease?" [ans: 0.55mm) with this question, I am not sure whether its ok to find...

Does an aluminum wire have any performance disadvantages other than having to be thicker to carry the same amount of current?

A square loop is cut out of a thick sheet of aluminum. It is then placed so that the top portion is in a uniform magnetic field B, and allowed to fall under gravity. So the square is in the y-z plane, and the magnetic field is -|B|x say, for z > 0, and the magnetic field is 0 below that. This...

An aluminum wire is hung between two towers and has a length of 175 m. A current of 125 A exists in the wire, and the potential difference between the ends of the wire is 0.300 V. The density of aluminum is 2700 kg/m3. Find the mass of the wire I have no idea how to do this :'(

im working on a lenz's law experiment where i am making an aluminum ring levitate on an iron pole, but I am not sure of the theory behind how it works, and what i should be writing about. any suggestions welcome.

Why is Al3 a conductor and Aluminum Trioxide is not?

This site made me laugh. http://zapatopi.net/afdb.html

There is a maximum height of a uniform vertical column made of any material that can support itself without breaking, and it is independent of the cross-sectional area. (a) Calculate this height for aluminum (density 2.7 103 kg/m3). (b) Calculate this height for granite (density 2.7 103...

I saw this arcticle on popular science's web site: http://www.popsci.com/popsci/how2/article/0,20967,693558,00.html it tells about a way using mercury paste to make aluminum rust, very fast and crumble to dust. as you can see in their picture, it apearently is true, and as they explain in...

Problem 2. Liquid nitrogen, which has a boiling point of 77 K, is commonly used to cool substances to low temperatures. How much energy must be removed from 1.4 kg of gaseous nitrogen at 77 K for it to completely liquefy? Assume the latent heat of liquid nitrogen is 2.01 *10^5 J/kg Answer...

An annular ring of aluminum is cut from an aluminum like attached. When the ring is heated, 1)the hole decreases in diameter 2)the area of the hole expands the same percent as any area of the aluminum 3)the area of the hole expands a greater percent than any area of the aluminum...

Aluminum wiring has sometimes been used instead of copper for economy. According to the National Electrical Code, the maximum allowable current for 12-gauge copper wire with rubber insulation is 20A. What should be the maximum allowable current in a 12-gauge aluminum wire if the power per unit...

Let's assume for the moment that beyond any doubt, global warming is real. Does this offer a viable solution to reduce global warming? Could this create another environmental disaster by loading the biosphere with aluminum oxide [apparently the preferred choice to be used in jet fuel]. The...

8. [CJ6 14.P.001.] A mass of 135 g of an element is known to contain 30.1 1023 atoms. What is the element? carbon hydrogen oxyden aluminum This is the question on my Physics practice test for my exam tomorrow. i don't know where to even begin with this one. we haven't really gone over...