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  1. Totalderiv

    Complex Eigenvalues

    Homework Statement Apply the eigenvalue method to find a general solution of the given system. x_1' = 5x_1 - 9x_2 x_2' = 2x_1 - x_2 Homework Equations (A-λI)v=0 The Attempt at a Solution x_1' = 5x_1 - 9x_2 x_2' = 2x_1 - x_2 \left[ \begin{array}{cc} 5-λ & -9\\ 2 & -1-λ...
  2. Totalderiv

    Matrices and Linear Systems

    Homework Statement Write the given system in the form x'=P(t)x + f(t) x'=-3y , y'=3x Homework Equations x'=P(t)x + f(t) x(t)=c_1x_1(t)+c_2x_2(t)+...+c_nx_n(t) The Attempt at a Solution I have no idea how to start this since my teacher never covered this in our notes and the book...
  3. Totalderiv

    Find a general solution of the differential equation

    Homework Statement Find a general solution of the differential equation. (x+y)y' = x-y Homework Equations v=x+y y=v-x y'=v'-1 The Attempt at a Solution So if I plug this back into the original equation; v(v'-1)= x-y How do I convert v=x+y into x-y so that I have only v's...
  4. Totalderiv

    Diff Eq- Nonhomogeneous Equations

    Homework Statement Find a particular solution of the given equation. y^''' + 4y^' = 3x-1 Homework Equations r^3 + 4r = 0 r = 0, r = 2i, r = -2i The Attempt at a Solution y(x) = Ax-B y^'(x) = A y^''(x) = 0 y^'''(x) = 0 The answer is: y(x)=(3/8)x^2 - (1/4)x But I'm not...
  5. Totalderiv

    Programs Spring Classes (Freshman Math Major): Too much?

    Hey I'm currently a freshman math major and just registered for my spring classes. When I went to my adviser, she thought I was insane for taking three math classes at one time. Am I insane? Schedule: -College Calculus 3 -Introduction to Differential Equations -Introduction to Linear...
  6. Totalderiv

    Solving Trig Integrals help!

    Homework Statement \int cos^6(x) Homework Equations 1 = sin^2(x) + cos^2(x) The Attempt at a Solution \int cos(x) * cos^5(x) \int cos(x) * (cos^2(x))^3 \int cos(x) * (1-sin^2(x))^3 This is where I got lost, we just started this topic and I have a lot of homework to do...
  7. Totalderiv

    Programs New Math Major scheduling help!

    Hey I'm currently headed off to University at Buffalo this fall for math and I'm stuck on scheduling. So far I know I'm talking Calculus II, but I'm not sure what else to take. What classes should I take as a freshman math major?
  8. Totalderiv

    Weird Integral Problem

    Homework Statement \int (x+8)/(x+4) Homework Equations N/a The Attempt at a Solution I tried to split the problem which resulted in: \int x/(x+4) + \int 8/(x+4) But now I'm stuck,and this is a bonus question on my AP Calculus homework.
  9. Totalderiv

    Calculators TI 89 Problem

    I just bought a brand new TI89 and the second I turn it on I go to Home. I press F1 to go to tools and the Open and New functions are fuzzy. It won't allow me to use those functions either. This is happening all over the place as I looked throughout the calculator. Any ideas?
  10. Totalderiv

    Calculus 2 and 3

    Hey, I'm wondering if any one knows of great self-study books on Calc 2 and 3 that give many examples and questions. Thanks
  11. Totalderiv

    Calculus 2 and 3

    Hey, does any one know good books that make it easy to self-teach Calc 2 and 3? Thanks
  12. Totalderiv

    Programs Math Major or Physics Major?

    Hey I'm sort of in a predicament at the moment, since I'm not sure what to major in. Physics has always been my passion as well as math. But, my current Physics class (high school) is making me wonder if I can put up with doing everything the professors way. I'm having a hard time with my...
  13. Totalderiv

    SUNY Stony Brook

    Can any one give some first hand experience or knowledge of the undergrad physics program? How is the program?
  14. Totalderiv

    Hydrostatic Equilibrium in General Relativity

    Homework Statement Finding the TOV equation of Hydrostatic Equilibrium in General Relativity Homework Equations The Attempt at a Solution For the above questions, I've scanned in my work...so that might help instead of typing it on the computer...
  15. Totalderiv

    Hydrostatic Equilibrium in General Relativity

    What am I doing wrong?
  16. Totalderiv

    Illinois Institute of Technology Undergrad Physics Program questions

    Hey, I was wondering if any one on this forum has gone to Illinois Tech for Physics, or has visited there. How's the physics program there?
  17. Totalderiv

    Undergrad Physics Programs

    Hello, I'm currently a junior in high school looking for the best undergrad physics program based off of my grades. Just to give you an idea: GPA: Unweighted: 3.3-3.5 Weighted:Not sure Extracurriculars: Did some research with Physics teacher, and some research with Math teacher...
  18. Totalderiv

    Hydrostatic Equilibrium in General Relativity

    Background info: Hello PhysicsForums, I'm currently a high school student in calculus and physics. I've been teaching myself Astrophysics by using the books Stellar Structure and Evolution by Springer-Verlag and Principles of Stellar Evolution and Nucleosynthesis by Clayton. I realize these are...
  19. Totalderiv

    Programs Planning for Astrophysics major, need some help

    Hello, I need some help figuring out my college plan as an undergraduate. I'm looking at applying to Ohio State University, University of Arizona, and Penn State University. I'm looking to do astrophysics, but most of them don't have it,so I'm looking to double major as physics and astronomy...
  20. Totalderiv

    Need some help deciding

    Need some help deciding!! Hello, I need some help figuring out my college plan as an undergraduate. I'm looking at applying to OSU, University of Michigan, University of Maryland, and University of Chicago. I'm looking to do astrophysics, but most of them don't have it. Would it be easier to...
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