# Search results

Ok...Thanks!
2. ### Particle in a Box

I got the answer now, but by changing my calculator to radians when calculating sin(2n∏x/L). Am I suppose to use radian instead of degrees?
3. ### Particle in a Box

I still don't understand. I may have wrote something wrong. The part that you highlighted should be: (L/n∏)
4. ### Particle in a Box

Homework Statement What is the probability, P, of locating a particle between x = 0 (the left-hand end of a box) and x = 0.2 nm in its lowest energy state in a box of length 1.0 nm? Homework Equations Probability = ∫ψ2dx ψ = (2/L)1/2sin(n∏x) The Attempt at a Solution ψ2 =...
5. ### Harmonic Oscillator eigenvalue

Homework Statement Write down the v=1 eigenfunction for the harmonic oscillator. Substitute this eigenfunction into the Schrodinger equation and show that the eigenvalue is (3/2)hν. Homework Equations The Attempt at a Solution I'm not really sure on how to to this, but heres...
6. ### Probability of finding a particle in a box

Homework Statement Consider ψ (x) for a particle in a box: ψn(x) = (2/L)1/2sin(n∏x/L) Calculate the probability of finding the particle in the middle half of the box (i.e., L/4 ≤ x ≤ 3L/4). Also, using this solution show that as ''n'' goes to infinity you get the classical solution of...
7. ### Absorbance of a solution

Not sure if correct but heres what I did to find the concentration. 5.49 ppm = 5.49 micrograms/mL = 0.00549 grams/L 0.00549 grams/L /(55.845 grams/mole) = 0.000106 M 0.000106 M * 5 mL / 50 mL = 0.0000106 M EDIT : Also I just realized that the molar absorptivity of FeSCN is not given in the...
8. ### Absorbance of a solution

Homework Statement 2. A 5.00 mL aliquot of a solution that contains 5.94 ppm iron (III) is treated with an appropriate excess of KSCN and is diluted to 50.0 mL.What is the absorbance of the resulting solution at 580 nm in 2.50-cm cell? Homework Equations The Attempt at a Solution...
9. ### Green's Theorem to evaluate the line integral

Homework Statement Use Green's Theorem to evaluate the line integral of the vector field F along the given positively oriented curve C. F(x,y) = <sin(x^3) +x^2(y), 3xy-(x)(y^2)+e^(y^2)> and C is the boundary of the region enclosed by the semicircle y = √(4-x^2) and the x-axis. Homework...
10. ### Determine whether F is conservative

I got it now :)
11. ### Determine whether F is conservative

Homework Statement F(x,y,z) = <2xy + ze^xz, x^2 +ze^yz, xe^xz + ye^yz + 2z> Homework Equations The Attempt at a Solutionf I know how to find the partial of F(x,y) but I don't know how to do it for F(x,y,z). How do I do this?
12. ### Line Integral

Honestly, I have no idea what to do, but here what I did. From (0,0) to (2,1) r(t) = (1-t)<0,0> + t<2,1> r(t) = <2t,t> x=2t y=t I found that the integral is from 0 to 1. dx/dt = 2 dy/dt = 1 ∫(x+2y)dx+(x^2)dy Then I set x as 2t and y as t into the equation...
13. ### Line Integral

Homework Statement Evaluate the line integral ∫(x+2y)dx+(x^2)dy, where C consists of the line segments from (0,0) to (2,1) and (2,1) to (3,0) Homework Equations The Attempt at a Solution I'm unsure of what to do. I did (1-t)r0 + t(r1) for (0,0) to (2,1) and (2,1) to (3,0). I...
14. ### Change of Variable in multiple Integrals

So I set 1 = 3u -2v and 2 = u+v. Then, I do 2-v=u and substitute u into the first equation? I get (1,1)
15. ### Change of Variable in multiple Integrals

I don't understand. How would I do this then?
16. ### Change of Variable in multiple Integrals

Homework Statement Let D be the triangular region in the xy-plane with the vertices (1, 2), (3, 6), and (7, 4). Consider the transformation T : x = 3u − 2v, y = u + v. (a) Find the vertices of the triangle in the uv-plane whose image under the transformation T is the triangle D. (b)...
17. ### Elastic/Inelastic collision

Homework Statement Let’s say you’re a scientist or engineer working for NASA and you are tasked with the responsibility of diverting an asteroid heading straight for Earth. You know that you must fire a projectile to deflect the asteroid as much as possible (without breaking it into many...
18. ### Buffers Lab

Homework Statement Calculate the theoretical pH of each solution. The first solution was 30.00 mmol of HOAc (acetic acid) and 53.00 mmol of NaOAc. There was no water in this solution. Homework Equations We have to use this equation. The Attempt at a Solution I'm unsure of what...
19. ### Local Max/Min and saddle points

Oh, I got saddle points at (1,1) and (-1,-1)
20. ### Local Max/Min and saddle points

Thanks man, figured it out
21. ### Local Max/Min and saddle points

No. I don't know how to solve for 0. I can't set both y or x on either side of the equation.
22. ### Local Max/Min and saddle points

Oh, I managed to type out the whole fy wrong. It is -x^2 -1 +2yx
23. ### Local Max/Min and saddle points

Homework Statement Find the local max/min or saddle points of f(x,y) = (x-y)(1-xy) Homework Equations The Attempt at a Solution I expanded the equation to f(x,y) = x-y-(x^2)y+xy^2. Then I found the partial derivatives of the function. fx = 1-2xy +y^2 fy = -x^2-2xy I'm...
24. ### Centripetal force vs period

Homework Statement When plotting the centripetal force vs period graph, what goes on the x-axis and y-axis? I thought that since centripetal force does not depend on period, it goes on the x-axis, but now I'm not too sure. It also says plot Plot Fc as a function of T. Homework Equations...
25. ### Analytical Chemistry - Systematic Treatment of Equilibrum

Hey Borek, I wrote out all the formulas. My question now is what exactly am I solving for? Am I suppose to solve for all the concentrations? [Ag+], [C2O4(2-)], [HC2O4-] and [H2C2O4]? Also how am I suppose to solve for Ag+? Is it 5.4E-12 = [2x]^2 [x]?
26. ### Analytical Chemistry - Systematic Treatment of Equilibrum

I found that Ka1 = 5.60 x 10^-2 and ka2 =5.10 x 10^-5. Another site listed 5.4x10^-2 and 5.4x10^-5. EDIT: Actually, I finally found it in my text book. Ka1 = 5.62E-2 and ka2 = 5.42E-5
27. ### Analytical Chemistry - Systematic Treatment of Equilibrum

Homework Statement Calculate the molar solubility of Ag2C2O4 (silver oxalate) in a solution that has a fixed H3O+ concentration of 1.0 x 10^-6 M. Homework Equations The Attempt at a Solution I found the pertinent reactions, the charge balance and the mass balance so far, but I...
28. ### Volume of a parallelepiped

Nevermind, I found out what I did wrong. I calculated on of the vectors wrong.
29. ### Volume of a parallelepiped

Homework Statement Find the volume of the parallelepiped with adjacent edged PQ, PR, and PS. P (-2,1,0) Q (2,3,2) R (1,4,-1) S (3,6,1) Homework Equations Volume = PQ . (PR x PS) The Attempt at a Solution I first found the vectors PQ, PR and PS. Then I did the cross product...
30. ### Limit and Continuity

Homework Statement lim of (y^2)(sin^2x) /(x^4+y^4) as (x,y) approaches (0,0) Homework Equations The Attempt at a Solution I got the limit as (x,y) approaches (0,y) and as (x,y) approaches (x,0), and it equals 0. But now I'm unsure of what to to next. I think it was the limit...