1. ### Finding mixture concentration using Beer's Law

I'm still slightly confused on how that would look? Are you saying we do: A1/A2 = (b1C1e1)/(b2C2e2)?
2. ### Introductory to chem course Stoichometry question wrong answer, can anyone fix it

What I do is convert everything to moles (mmoles) in order to figure it out. 19.62 mL * 0.341 M NaOH = 6.69 mmoles OH- To completely neutralize that, you need an equivalent in H+, so you need 6.69 mmoles H+. However, H2C2O4 produces 2 H+ per dissociation, so you would need half that amount, or...
3. ### Finding mixture concentration using Beer's Law

Homework Statement A 0.0450 M solution of para-aminobenzoic acid had an absorbance of 0.844 at 267 nm in a 1.00 cm cuvet, and an absorbance of 0.034 at 240 nm. A 0.0366 M solution of nicotinic acid had absorbances of 0.010 and 0.755 at 267 and 240 nm, respectively. A MIXTURE of PABA and...
4. ### Curly Electric Fields

Not much because I don't know what to do with it. What would the flux be? Would it be emf = -dΦ/dt Φ = BxA emf = (-d/dt)BxA? Does B = B0 + bt^3?
5. ### Curly Electric Fields

Homework Statement The magnetic field is uniform and out of the page inside a circle of radius R, and is essentially zero outside the circular region (see the figure). The magnitude of the magnetic field is changing with time; as a function of time the magnitude of the magnetic field is...
6. ### A neutral metal rod in a uniform magnetic field

Wait a minute, I got it; the stupid thing wants to the ABSOLUTE VALUE.
7. ### A neutral metal rod in a uniform magnetic field

Homework Statement A neutral metal rod of length 0.35 m slides horizontally at a constant speed of 9 m/s on frictionless insulating rails through a region of uniform magnetic field of magnitude 0.6 tesla, directed into the page as shown in the diagram. Before answering the following...
8. ### Circuits and Loop Rule

Homework Statement Write the loop rule for each of the following circuits: Homework Equations Depending on the loop: -emf + IR1 + IR2 + .... + IRn = 0 V = IR If in series: R1 + R2 + ... Rn = R If in parallel: 1/R1 + 1/R2 + ... 1/Rn = 1/R The Attempt at a Solution I really...
9. ### Electric Field of Single-Battery Circuit with Thin/Thick Wires

I solved it all on my own. I'll post the solution here so people will know how to do it if they come across it. i = naME i = electron current n = electron density a = area M = electron mobility E = electric field For the thin and thick wire, the electron current for both of them is...
10. ### Electric Field of Single-Battery Circuit with Thin/Thick Wires

Homework Statement The circuit shown above consists of a single battery, whose emf is 1.4 V, and three wires made of the same material, but having different cross-sectional areas. Each thick wire has cross-sectional area 1.4e-6 m2, and is 21 cm long. The thin wire has cross-sectional area...
11. ### Charged capacitor, electric field

http://i212.photobucket.com/albums/cc150/deadfishfactory/Untitled-1.jpg I don't know if that's any help. I did that, and it's still wrong.
12. ### Uniformly-charged Thin Rod

http://www.csulb.edu/~htahsiri/studyguide/Mathematica/physics/chargerod/chargerod.html What is it supposed to be?
13. ### Uniformly-charged Thin Rod

Homework Statement If the total charge on a rod of length 0.4 m is 2.6 nC, what is the magnitude of the electric field at a location 1 cm from the midpoint of the rod? Homework Equations [(2QK)/(Y)](1/sqrt(L^2 + 4[(Y)^2]), K = 8.99E9 I don't know if the above equation is actually correct...
14. ### Charged capacitor, electric field

Thanks for that. It says that sparks occur when the electric field strength is 3x10^6 N/C. So if you have that, then: E = E1 + E2 E = [Q/(A/2e)] + [Q/(A/2e)] (R>>Z) 3x10^6 = 2[Q/(A/2e)] 3x10^6 = 2[Q/(pi(2.4)^2/2(8.58E-12)] Q = 3E20 N/C. What am I doing wrong here?
15. ### Charged capacitor, electric field

Homework Statement A capacitor consists of two large metal disks of radius 2.4 meters placed parallel to each other, a distance of 0.7 millimeters apart. The capacitor is charged up to have an increasing amount of charge +Q on one disk and -Q on the other. At about what value of Q does a spark...