# Search results

1. ### Biochem practice exam help - Test tomorrow

Hi all. I have a biochem test tomorrow, and would like some help. I went through the practice exam that was given to us, and from past experience the real test and practice test tend to be very similar. Also, from past experience, I tend to get a couple of them wrong because I believe that I...
2. ### Linear Algebra: 4 Fundamental Subspaces

Homework Statement Without computing A, find the bases for the 4 fundamental subspaces. [1 0 0][1 2 3 4] [6 1 0][0 1 2 3]=A=LU [9 8 1][0 0 1 2] Homework Equations N/A The Attempt at a Solution There was an "example" in the book. It just showed the answers. It was: [1 0...
3. ### Simple Linear Algebra question

I have to do a LDL^{T} transform of a symmetrical matrix: [2 -1 0] [-1 2 -1] [0 -1 2] And, I'm just wondering if I have to do a row exchange, or something. I can't remember if the L matrix has to have the form [x 0 0] [x x 0] [x x x] where the x's are nonzero numbers...
4. ### Friction: Block on Ramp

Homework Statement A block slides down a slope from point O with initial speed V. THe sliding coefficient, mu, brings the block to rest at time T. Using the ramp as the x-axis and the perpendicular as the y-axis, find T. Homework Equations F = ma mu = mg sin(theta) a=dv/dt The...
5. ### OPTICS - Final tomorrow - Practice test help

Homework Statement Homework Equations The Attempt at a Solution (3) I haven't been able to start this one at all. (6) I got part a (+45º P-state). I tried to do b and I got [1+i, -i+1] which isn't a polarization state, so I'm not sure what to do with c or if there is some...
6. ### Optics - Diffraction

[SOLVED] Optics - Diffraction Hi. I was given an extra credit problem in class to derive equations related to multiple slit diffraction. I was wondering if someone wouldn't mind looking over what I have so far, and pointing me in the next direction. Thank you! Homework Statement Homework...
7. ### Optics exam tomorrow, need help please

Hello, first time poster. I'm in an optics class because I thought it would be fun, but I'm having a terrible time. And I didn't do so well on the first test. The second test is tomorrow and I want to do well on it. We were given a practice exam with 3 questions. I got two of them, but the third...