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Homework Statement This is the statement out of a paper: Slurry 10 grams of ZnS with 3mL of .2N Cu(CH3COO)2 solution (corresponding to 0.6 atom % Cu) and 1.7 mL of .2N NH4Cl solution (corresponding to 0.34 atom % Cl) So my question is how did they calculate the .6 at. % and .34 at. %...

Homework Statement Calculate the volume of 0.116 M HCl(aq) required to neutralize the following solutions. all the hydroxide ions in 25.0 mL of 0.215 M KOH(aq) 1. What is the molarity of Cl - ions at the stoichiometric point? Homework Equations HCl + KOH --> KCl + H2O The...

Thank You, I figured it out

Tell me if I'm headed in the right direction since we are dealing with an electron I know the charge therefore should be able to figure out the electric field using the F=qE formula. |F|= 5.6e-14N q= -1.6e-19C E=350,000 N/C

I am sorry but can you tell me how I would go about calculating the strength of the field. I assumed you would have to know the charge first to figure out the strength.

Homework Statement A solid metal ball of radius 1.5 cm bearing a charge of -16 nC is located near a hollow plastic ball of radius 2 cm bearing a uniformly distributed charge of -4 nC on its outer surface. The distance between the centers of the balls is 8 cm. What is the electric field...

When your calculating the speed at which he must move remember that he is already 10 meters away, just a thought.

Well if you plan on using your graphing calculator: you simply graph the function and use the calculators min/max function to find the x value at which it reaches maximum height, which corresponds to the peak of the parabola. Or if you know some calculus you can always take the derivative of the...

Homework Statement In a cathode-ray tube (CRT), an electron travels in a vacuum and enters a region between two "deflection" plates which have equal and opposite charges. The dimensions of each plate are L = 13 cm by d = 4 cm, and the gap between them is h = 2.5 mm. During a 0.001 s...

Oh yes your right, I just kept converting the cm to m wrong, putting an extra zero in front of it like they were mm or something. Thank You so much it really helps having someone else look at this. I knew I had to be making some stupid mistake.

The components of the positions are in centimeters. (cm)

Homework Statement At a particular moment, three small charged balls, one negative and two positive,are located as shown in the figure. q1 = 3 nC, q2 = 7 nC, and q3 = -5 nC. What is the electric field at the location of Q1, due to Q2? y q1 | | | q2______q3____x Okay...

Oh I think I figured out where I went wrong I forgot to cube d,

Homework Statement A dipole consists of two charges +q and -q, held apart by a rod of length s, as shown in the diagram. If q = 4 nC and s = 2 mm, what is the magnitude of the electric field due to the dipole at location A, a distance d = 5 cm from the dipole? The diagram shows point A...

Yes the |r|^2 was dubious After reworking that I got |r|=1.6882e-8 Plugging this back in I get E=[9e9*(1.602e-19)/(1.6882e-8)^2]*< -0.5923, 0.4739, 0.6516> =<2996700,-2397300,-3296300> Is this a more reasonable answer?

Homework Statement A π- ("pi-minus") particle, which has charge -e, is at location ‹ 5.00e-9, -5.00e-9, -6.00e-9 › m. What is the electric field at location < -5.00e-9, 3.00e-9, 5.00e-9 > m, due to the π- particle? 5e-9 is equivalent to 5*10^-9 Homework Equations E=(k*q/r^2)r-hat...

Okay I figure it out i was doing it right but when it cam e to combining the two components i was just adding them instead of finding the magnitude for velocity. Which involve taking the sqaure root of the squares of the components.

Homework Statement A sailboat is traveling east at 5.0m/s. A sudden gust of wind gives the boat an acceleration a =(0.80m/s^2) (40 north of east). Homework Equations What is the boat's speed 6\;s later when the gust subsides? I know the answer is 9.21m/s, but I am having...

Homework Statement Balance the following Chemical Equation (x1)KMnO4+(x2)MnSO4+(x3)H2O->(x4)MnO2+(x5)K2SO4+(x6)H2SO4 Homework Equations Here is the matrix I came up with but it seems to be flawed but I am unable to see what i am doing wrong 1 0 0 0 -2 0 (K) 0 1 0 -1 0 0 (Mn) 4 4 1...

Just curios jhony did you happen to get the instructions from the cookbook, because if you did you know its a load of crap right? Just a warning. But it is possible to make good amounts of rust with a decent power supply. You have to connect the positive lead to what ever you want to turn to...

yeah i always thought opening mail that doesn't belong to you is illegal but the police officer's explanation was that the person who received the package wasn't wearing his glasses so he did not see the address. which i think is a load of bs. But i am not to worried about it since the package...

Ok today i had an officer deliver a package to my house. He also preceded by asking one of the my fellow residents what the package contents were and why it was ordered. Apparently UPS delivered the package to the wrong address and that person opened the package and didn't know what the...

Thank you for sharing your thoughts and ideas. I guess with advancements in genetic engineering something similar to the rage virus could be developed. Probably not as deadly as the rage but similar enough to be a threat.

Not sure where this post belongs, but anyway i was wondering if a virus such as the one depicted in 28 days later could ever be developed or evolve from some virus that we know of today. From what i know i think viruses are capable of evolving because when i read the hot zone it talked about a...

Thanks I just tested it out and it works great. i appreciate your help everyone

Just to make sure is this what you mean: http://s106.photobucket.com/albums/m261/Squall_11/?action=view&current=Ammeter.jpg Thanks A lot

Hi i recently acquired an ammeter with a shunt can anyone explain how to wire this so i can measure amps in an electrolytic cell. Does the positive lead have to be wired across the shunt so that it doesn't burn out the lcd display. I've never used such an ammeter so any suggestions will be...

Just wire it up works great Thanks a lot

Thank you Integral that's a lot easier than trial and error.

I have a potentiometer but I don't exactly know how to wire it. I remember messing with it a few months ago but i hooked it up by trial and error. It has three prongs they're not labeled. If some one could explain how it works i will appreciate it.

Hi i am trying to make a magnetic stirrer. I have seen tutorials on how to make a magnetic stirrer from a pc fan and magnets. i have actually constructed such a device, but the results I got were less than satisfactory. My problem is that the flea used to stir the solution doesn't want to spin...

I have not tried linseed oil yet but I'll probably give it a shot. I have a question about using NaCl solution the question is how can i know when most of the NaCl has been converted to NaClO3 if it doesn't precipitate out. Are there ways of checking the NaClO3 concentrations in solutions.

Ok I see your right it does percipitate out while the cell is operating and i guess i do loose a good bit of product in the filtration process. You said it the precipitant causes the cell to dissipate more energy and heat could this be a cause for excessive anode wear. any way thanks for the...

Thats what I assumed, thanks for your reply, but i do have another question why is it better to use NaCl then do a double replacement does that result in higher yields. I've had decent results with using a solution of KCl.

i just recently acquired a few pieces of copper impregnated graphite. this stuff is supposed to have high wear resistance in EDM applications So i thought i would give it a shot in a chlorate cell. After a few minutes of operation my electrolyte which is a solution of KCL, turned blueish green...

yes Norton says it is a low risk trying to contact DNS server but when i scanned my pc it came up clean. I found all of the programs in the temp files folder. I am going to attempt to delete them

I have at least 30 of such processes running at one time

Hi i am having a little bit of a problem for some strange reason my computer is running random numbered .exe programs example: 361921.exe and each one is trying to contact the DNS server. Can anyone tell me what this is or how to fix it. I think it had something to do with the latest windows...

If you are trying to make chlorate i would go the electrolysis way. It might take a little longer and require a some work, but the results you get are a whole lot better thah boiling bleach. i a m actually working on a new cell design at the moment. If you are interested i could share my luck...

I would like to know what happens when a nitrate is added to sulfuric acid. ex. KNO3 plus H2SO4 what does that yield.

I think i got it now but if you got tips please share

Homework Statement x+2y+6z=4 -3x+2y-z=-4 4x+2z=16 Homework Equations I am having trouble solving this equation since i was absent for notes I would appreciate an attempt to explain the process to me. The Attempt at a Solution I know the basics but if some one could show me...

its rated at 12v .15A. So how those this voltage regulator work exactly.

no they didnt i used a 9 volt battery no sparks no nothing until i got the right circuit and the motor turned on. But i am disapointed at how hard it is to get the right voltage i need a very specific voltage to achieve a maximum vortex which is around 5.6 volts. I've only been able to hit the...

thanks but i figured it out through trial and error

i need to know how to wire a potentiomete into a circuit. More specifically i am making a meagnetic stirrer and need to regulate voltage how would i wire the pot into the circuit.

thanks that clears it up and sorry for my stupid mistake, but this is my fist time dealing with such electronics.

so how exactly would you use a resistor to measure current. Would you get a 33A resistor and see if the voltage is what is supposed to be in this case it should be 5. Is that basically it

yes i need to be able to measure up to at least 35A and digital meters only go up to ten. i was wondering what about the Ammeters used in cars can i use those.

I recently modified a computer power supply into a lab power supply. I would like to check the amperes bieng output, but where can I get an ammeter? Or can i make one and how much does one cost. Heres a link to a pic of my PSU http://i106.photobucket.com/albums/m261/Squall_11/PSU002.jpg