Search results

  1. M

    Gravity problem

    F=GmM/r^2 where m is the mass of the earth, M is the mass of the sun, G is a constant, and r is the distance between the earth and the sun. This is exerted on the sun and the earth in the same magnitude and opposite direction. For the earth's motion: F=ma. Thus: ma=GmM/r^2 --> a=GM/r^2, so...
  2. M

    Why is there a kicker in (American) Football?

    It's a plot to keep evil foreign games out of the states. If the took out the kicker, they'd have even less reason to call it football.
  3. M

    I suck at math

    Linear Algebra Done Right by Axler is fairly good, but you'll probably want to read from another book to supplement the fairly short section on determinants. I read bits of Linear Algebra Done Wrong by Treil for a better treatment of determinants -- it's free in pdf here...
  4. M

    Laptop versus handheld for taking notes in class

    A tablet might work. Some people complain that there isn't as much friction as paper, but the ability to drag and drop things is very useful. I take notes and do all my homework on a HP TC1100. (I'm in math, if it matters)
  5. M

    lack of female engineers

    Sylvia Plath's Ariel poems are as good as Nabokov's best writing. I can't think of any other woman I'd rate with Nabokov, Dostoyevsky, or Kafka or any woman I'd rate with Joyce. This could reflect the distribution of talent, but it could certainly be cultural. It could also reflect the...
  6. M

    Permanent Magnets and Maxwell's Equations

    That is not my qusetion. How can I quantitatively predict the force one permanent magnet exerts on another?
  7. M

    Permanent Magnets and Maxwell's Equations

    This isn't homework. I know it doesn't have a nice analytic solution, so it wouldn't be in a textbook. Let me clarify my question. If I had a speaker magnet, I could run a current through a wire and measure the force to determine the strength of the magnetic field at any point around it. How...
  8. M

    Permanent Magnets and Maxwell's Equations

    How do you predict the interaction of two permanent magnets using Maxwell's Equations?
  9. M

    Anyone have good hold em poker strat sites?

    This is the worst advice you will ever see. How frequently you should fold depends on if you're playing structured limit, spread limit, pot limit, or no limit and on your opponent. Do not fold so much that betting every hand is a profitable strategy for your opponent, they'll figure it out.
  10. M

    Does reading poetry to girls really work in wooing them?

    Girls fall over on the street at "You do not do, you do not do \ Any more, black shoe." If you're going to read poetry to woo women, you'll have to read them poetry written with the intention of getting money from hallmark or getting laid. The latter sort is better, but good poets seem to get...
  11. M

    Check out this snake I killed that was in my tree.. .

    The triangle-head test is bs. Rat snakes and king snakes usually have longer heads than pit vipers, but they're both more or less triangular. You killed a black racer. Pit vipers in general, and especially cottonmouths, are much thicker than that.
  12. M

    What is the most psychedelic song from the 60s?

    Pow R Toc H on Piper at the Gates of Dawn
  13. M

    How to be considered really cool in high school?

    After the real jackasses drop out (usually by junior year), the notion of "cool" dies. It did at my school. If he wants to meet people, and he can't play a sport, he should probably take up poker (probably Texas Hold 'Em, it's the only card game you see kids playing now that ESPN airs reruns...
  14. M

    Going to Amoeba & Rasputins...need some new MUISC MUSIC MUSIC!

    Blur, A Silver Mt. Zion (GSYBE spinoff)
  15. M

    some easy math problem.. grr

    It's (tan[x]^4)/4+c. sec[x]^2= d/dx tan[x], so you have tan[x]^3dtan. If you can't see it right off, let tanx=u: int[u^3du]=u^4/4+c.
  16. M

    Which ficitonal book/movie character do you resemble the most?

    Mine scare me a bit--Dostoyevsky's Underground Man and Joseph K from The Trial.
  17. M

    Simple matlab programming question

    I'm trying to change the color of plot lines with the index of a for loop. I have a long if list that like this: elseif(jm==6) ls='b'; but I get an error on: plot(t,y(1,:),'ls-'); whereas I get a blue line from plot(t,y(1,:),'b-'); How do I fix it?
  18. M

    blackjack strategy

    If you don't count, there's no reason to vary your bets and you should wind up losing. The only real stategy there is to blackjack without counting is memorizing a hand chart, which will tell you exactly what to do in every situation.
  19. M

    Help me think of column ideas for school newspaper...

    A disturbing national trend in high school english classes - world lit is now all amy tan. The literature of other cultures has been replaced by the literature of being from another culture.
  20. M

    Do you get tired of people asking "How are you"?

    Don't make a habit of commenting on things like that. People get annoyed easily by any response that is atypical of the average person and typical of the speaker. I think it's really that people get annoyed when they are having a conversation that plays out exactly as they'd expect it to --...
  21. M

    Is 1 = 0.9999......

    I'm not arguing with your 1st point, I couldn't think of a valid way to define .999999999999...8 but Transcendentals are still real.
  22. M

    I solemnly admit my defeat...

    Can you suggest a book for Lagrangian/Hamiltonian Classical Mechanics?
  23. M

    Vector Calc Question (Stokes Theorem)

    Prove that the flux of a constant vector C over a surface equals half the line integral around its boundary of C x r. All I can see is that by Stokes' Theorem, it would be true if curl(C x r) = 2C. When I calculate curl(C x r), I get something that looks like C * -grad(r) x grad(r), which...
  24. M

    Easy Multivariable Calc problem

    I'm a jackass, and I can't differentiate. I'll have to use dw/dt, etc to denote partials because i don't have curly ds. x=rcos(t). Show that dw/dx=(dw/dr)cos(t)-(dw/dt)(sin(t)/r) My flawed solution: dw/dx=(dw/dr)(dr/dx)+(dw/dt)(dt/dx) r=x/cos(t), dr/dx=1/cos(t) x=rcos(t)...
  25. M

    Somethign that cannot be explained with science

    The motion of three planets of similar mass due to gravity.
  26. M

    Physics Problem

    Centripetal force doesn't exist - it's a force required to make something go in a circle. Though you can resolve the normal force into the centripetal and a component that is directed above normal, it obviously has no component up along the wall. Am I missing something?
  27. M

    Physics Problem

    How can centripetal force being exterted by a wall, normal to the wall, cause an acceleration upward along the wall?
  28. M

    Physics Problem

    There is a cone, point at the bottom, generated by a line an angle t from vertical. It is being rotated on its point. There is a block somewhere on the inside of the cone at height h. Coefficient of friction is u. Find the max velocity and the min velocity at which the block stays in place...
  29. M

    HS Seniors, where are you applying?

    UChicago EA maybe MIT EA Cornell Stanford Michigan Wisconsin URochester Pomona Swarthmore
  30. M

    Books that every intelligent adult should read?

    Another vote for Lolita and everything else Nabokov wrote (I've read Pale Fire and Speak Memory, both good) A Portrait of the Artist as a Young Man If you liked Portrait, Ulysses. If you want a less known, respected book to speak about while looking down your nose at people, try Robert Musil's...
  31. M

    TI Calculator: Worth $90???

    What was your score LM?
  32. M

    Superstring Theory: what do you think?

    Ask Wolfram if math is the universal language. Quantitative theories are limited by our ability to represent things mathematically.
  33. M

    Poll: Should literature be a required subject?

    I'm only guessing at what you've been reading, but I think I have a good chance of being right (about the books, not the pretentious bit about you being force-fed the wrong books). The Great Gatsby and Huck Finn were both pretty bad. I enjoy Orwell, but he's a storyteller, not an artist...
  34. M

    Poll: Should literature be a required subject?

    High school english classes are usually terrible. Kids get little or nothing out of them because half of their teachers lecture directly from sparknotes, and the others ask them to analyze Lord of the Flies psychoanalytically without allowing them any time to read Freud or Lacan. Nabokov...
  35. M

    Manipulating the Zeta Function

    For better notation, go here: http://www.wikipedia.org/wiki/Riemann_zeta_function The mathworld article doesn't deal much with the non-complex zeta function.
  36. M

    Manipulating the Zeta Function

    Already posted in OT: I'm screwing something up when I manipulate Euler's Zeta Function. Somebody tell me what it is. I'll be using Z for zeta(s), and when i type 1/n assume i mean 1/n^s where s >1. A better version: Z=1+1/2+1/3... Z/2=1/2+1/4+1/6... Z-Z/2=1+1/3+1/5+1/7... Z-Z/2=Z(1-1/2)=Z/2...
  37. M

    Math Question (I'm a jackass)

    Thanks, I hadn't considered that. I've changed it in the original post.
  38. M

    Math Question (I'm a jackass)

    This isn't homework. My Math Teacher/Math Team Coach thought I'd find it interesting, and I want to know why I can't get the result I should be getting. Yogi: Aren't those expressions equivalent? It reads like (1/x) * 2 should be 2/x to me. Or is it an unfunny joke?
  39. M

    Math Question (I'm a jackass)

    I'm screwing something up when I manipulate Euler's Zeta Function. Somebody tell me what it is. I'll be using Z for zeta(s), and when i type 1/n assume i mean 1/n^s where s >1. A better version: Z=1+1/2+1/3... Z/2=1/2+1/4+1/6... Z-Z/2=1+1/3+1/5+1/7... Z-Z/2=Z(1-1/2)=Z/2 Thus...
  40. M

    What's more important? SAT I or II?

    SAT I unless you're applying to UCs.
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