Recent content by maceng7

Hey thanks for your replies. Yes I am only limited to non-destructive tests. So I can't do any tensile or compression tests. A magnetic test is a great idea, I just don't know of any other tests that will tell me exactly what material I'm dealing with. Like I said, I've tested for conductivity...

Homework Statement I have a project for my Materials Science and Engineering class and we have were given 4 unknown materials and we have to determine which kind of materials they are. We have to come up with our own experiments. As of now, I've done the Rockwell hardness test, electrical...

Homework Statement A nuclear power station reactor using 235 U (Uranium) as fuel has an output of 107 W. How much uranium is consumed per hour if the overall efficiency is 10%. The 235 U decays by the following reaction: n + 235 U → 144 Nd + 89 Y + (3)(n) + (7)(e-)Homework Equations P = E /...

I'm just wondering if there are any difficulties that must be overcome to use mass spectrometry. For example if you were to use it with the three isotopes of Carbon ( C12, C13, and C14) where C12 has an abundance of 99%, C13 1% and C14 0.0000000001%. Based on the abundances how would mass...

Alright I think I did this one correctly lim x--> 1+ ln(x) * tan(∏x/2) I found this limit by putting ln(x) in the numerator and tan(∏x/2) in the denominator. I used l'hospital's rule once and found it to be 1/∞ so my answer is 0. Is this correct?

What's a good way to start then? Putting the function whose derivative is simpler on the bottom or top or does it even matter?

Hey I'm doing indeterminate products and using l'hospital's rule and does anyone have a strategy that works well in determining which function you put as your denominator? Obviously there isn't one strategy that works 100% but I'm just wondering if anyone knows a good way of determining this...

Homework Statement The picture of the problem can be found here: http://www.2shared.com/photo/U_JIkDks/Capture.html The questions that I'm having trouble with are: (a) The magnitudes of the charge densities on the inner and outer shells are now changed (keeping λinner = -λouter) so that...

I don't know I've put it into my calculator numerous times and I get the same value,

Homework Statement A 0.0200 mol/L acid solution has a pH of 2.347. Calculate the percent ionization of this acid. Calculate the Ka of this acid The Attempt at a Solution I first calculated the hydronium ion concentration: 10^-pH = 10^-2.347 = 4.5*10^-3 I then used this concentration...

Thanks a lot guys, Borek I'll keep that in mind in the future thank you and Dchair thanks for looking over my work

Homework Statement An aqueous solution of chromium(III) iodide is mixed with an aqueous solution of lead(II) nitrate (a) Write the molecular equation for this reaction (b) Write a complete ionic equation for this reaction (c)If this reaction occurs, write the net ionic equation I'm...

Homework Statement A cube of gold is heated to a temperature of 94.2 degrees celsius, and then submerged in 31.3 mL of water at an initial temperature of 28.7 degrees celsius. If the final temperature of the water is 45.6 degrees celsius, calculate the volume of the cube of gold (s=0.130...

Homework Statement A gas is in a piston which is at 25 degrees celsius with a volume 4.0L is held in a room at atmospheric pressure. If the temperature is increased to 193 degrees celsius, the piston expands to it's maximum volume. If the pressure in the room is then increased to 4.3 atm, what...

my mistake, yeah I'd definitely divide my answer by 1000. Also for sig figs, since the question says "one milliliter" how many digits should I interpret that as? Should I let the volume = 1mL, which would give me one sig fig in my answer or should I just make it 1.00mL and include 3 sig figs in...