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  1. H

    Best...Youtube Video....Ever!

    Oldsmoboat's. That's just disturbing...
  2. H

    Confederate/Rebel flag

    Actually, the main result of the war was the near complete demolition of all infrastructure in the South, the razing of every major southern city, the wholescale death of a whole ton of southerners and the near complete annihilation of the economy and political rights of most southern states for...
  3. H

    0.000...1 = 0

    I'm nipping this in the bud: Consider the number 0.1. This is equivalent to 10^(-1). Then 0.01 = 10^(-2), 0.001=10^(-3), etc. Then if there are n 0s between the decimal and the one, the number is 10^(-(n-1)), clearly. Now we increase n arbitrarily, to 0.000...1: lim (n->infinity)...
  4. H

    Failed my Background Check

    Um... Yes? Why would you not?
  5. H

    It isn't right that I have to take all of these stupid history, polisci GE, when they don't have to take Calculus GE.

    Explain to me how history benefits a cop, fireman, nurse, teacher (calculus), etc in their day to day lives and you can call it even. Truth is, every medical profession requires a good amount of calculus and statistics in order to do their job to its fullest potential, alongside a careful...
  6. H

    MATH riddle that is stumping me

    r = 2^(n-1) Total = 2^n - 1
  7. H

    how close to the sun would the earth need to be to

    Not in any predictable fashion. Remember, the mantle is liquid, and the currents and eddies in it are dictated by the spinning of the core, not the fact that the core is half liquid. Whether the force of the mantle expanding as such would have major effects on the earth is debatable, but I'd...
  8. H

    how close to the sun would the earth need to be to

    Pretty sure freezing the core would just kill the magnetic field, and pretty sure that the effects of this, while unpredictable, would not amount to a catastropic world destroying event. Best case, all the migratory birds in the world die off and we lose all our auroras. Worst case, weather...
  9. H

    how close to the sun would the earth need to be to

    Those models also tell us that leaving it where it is makes it into a clone of Venus. :-P It is a pretty complex question - as more water evaporates, cloud cover and albedo will similarly increase, reducing the amount of heat trapped by the earth. Increased efficiency of carbon burnoff...
  10. H

    physic 101: so why does it feel colder up in the mountains when we are closer to the sun

    EDIT: Had stuff backwards at first Right, so Guy-Lussac's law has little to do with this, I was misinterpreting it. As you heat air, it rises due to the differential density of the atmosphere (due to gravity pulling it tighter lower and looser higher). If this were the only effect, it would...
  11. H

    Simple calculus problem

    Fractional is same as normal power. f(x) = (x-2)^(-1), f'(x) = -1 * (x-2)' * (x-2)^(-2) = -(x-2)^(-2) = -1/(x-2)^2.
  12. H

    How do i calculate square miles in a circle?

    Somebody didn't pay attention in Calculus. Only in the case of a fractal surface would you get an infinite surface area - since atoms are ultimatley round, you would come out with a large but finite surface area, the point being that since as you get down to smaller scales the areas involved...
  13. H

    What really vigorous endothermic chemical reactions are there?

    A really fast endothermic reaction? Photosynthesis.
  14. H

    POLL: Who is your favorite Philosopher and why?

    Karl Popper. Father of modern scientific philosophy.
  15. H

    Neon Genesis Evangelion - just finished watching it for the 1st time

    Watch the movie, End of Evangelion. They ran out of money on the last two eps and had to rush them... The last two are traditionally thought of as Shinji's introspective during the events of that movie.
  16. H

    Ever thought about the progress of military technology in the last 67 years?

    I keep hearing this bantered around and such, and I'm actually quite curious... ~what~ wealth of scientific knowledge would a human presence on Mars fetch us, really? There aren't any resources there that aren't here, there's no benefit for astronomy given modern lensing techniques, the...
  17. H

    Physics gurus- do I have all the necessary variables?

    Conservation of energy: 1/2 m_bullet v^2 = (m_bullet + m_block) g d u v = sqrt ( 2 * (m_bullet + m_block) ( 9.8 m/s^2 ) ( 0.3 m ) ( 0.20 ) / m_bullet ) m_bullet = 0.005 kg, m_block = 1.00 kg. Solve.
  18. H

    Need a little math help

    It IS solvable with current information. Define a 90 degree arc of the circle with one leg of it passing through B and the other leg parallel to CD. Then each side is 24" long, and you cut in half the distance along that long hunk of circle. Then using assorted trig identities and direct...
  19. H

    How much does liquid helium cost?

    I'm a structural biologist with experience in NMR/MRI (same thing): The cost lies in replacing the system. Typically, you just fill the thing with liquid helium to induce the formation of superconducting electron pairs, creating a superconducting magnet. In NMR systems, you fill the system...
  20. H

    A little physics brain teaser to drive you crazy.

    No, it's not. It's a paradox meant to illustrate that it's possible to take an infinite number of actions in a finite length of time. If you can't do something an infinite number of times, you'd never actually reach anywhere. Ergo, you can take an infinite number of actions in a finite space...
  21. H

    Physics/probability question

    He's wrong on a technicality, actually. In reality, you don't divide by 2 for a protein. See, proteins have an inherent order to their sequence due to the fact that on one end of the protein, you have a carboxylic acid, and on the other terminal you have an amine. Chemically, these are...
  22. H

    What method would you use, and/or what substitution would you make, to solve this integral?

    Quadratic formula + Partial Fractions.
  23. H

    Report: Artifically-created black holes unlikely to destroy Earth

    Correct. The type of Black Holes the accelerator would produce would evaporate almost instantaneously due to Hawking radiation -> no risk of swallowing the earth.
  24. H

    Anyone here go to NC State?

    I didn't, but Anand did.
  25. H

    List some things that were dismissed as science fiction

    Nobody ever thought the earth was round - that was just a myth started in the 18th Century to make prior periods sound dumber than they were. The Greeks computed the circumferance of the earth to a very small amount of error, and that knowledge was available and accepted through to the present...
  26. H

    Boys are being failed by our schools

    Einstein was a statistician. Nearly all of his great accomplishments, with the exception of the maths for theory of relativity (for which all the calculus had been done already by Laplace - the extension to physics was just Einstein being a genius, not being good at calculus) all of his great...
  27. H

    Wow, 20 years after Chernobly

    This is a terrible article and an outright lie. Chernobyl gets hyped up a lot, but I think it really demonstrates the extreme ~safety~ of nuclear power. When the worst case scenario kills fewer people over twenty years than a comparative coal system kills in maybe two or three years, that's...
  28. H

    Need Chemistry Help

    PV = nRT n = m / M PV = mRT / M P 1/(d) = RT / M M = RTd / P R = Gas Constant T = 273 K d = 4.00 g/L P = 1 atm. Plug, chug, solve.
  29. H

    Do you believe in the Big Bang & Big Crunch Theory?

    The big crunch hypothesis has been conclusively (well, as conclusively as anything can be refuted) refuted for the last 10 years. Accelerating Expansion following Big Bang -> eventual heat death of universe. Accelerating Expansion + General Relativity -> Big Crunch impossible. /thread.
  30. H

    Explain to me Gandolf the Gray vs Gandolf the White....

    Gandalf was of the Maiar, a race best described as being the 'angels' or 'demigods' of Tolkien's world. After his death in combat with the Balrog, he was sent back by one of the Gods ('Valar') to take Saruman's place as the leader of the Maiar that had been sent into Middle Earth following...
  31. H

    Any EEs or EE Students - Need your help

    Can you just take the limit as inner radius drops to zero for the tubular case, or are these just numbers they're supplying?
  32. H

    Meat, anyone?

    Incorrect. All seared meat contains carcinogens in the form of polyunsaturated ring systems, most notably Polycyclic Aromatic Hydrocarbons (PAHs) formed by the incomplete combustion of fats. As lab-grown meat will be leaner and in theory contain nothing besides what one typically finds in...
  33. H

    Don't really understand this math problem.

    Not true - it's just 2Pi in this case. The period of a function f(x) is unchanged by simple additive elements on x - eg, the period of f(x) = the period of f(x+9) = the period of f(x+ab). All that matters here is your independent variable x. In general, if you can transform one curve into...
  34. H

    They say second hand smoke is the worst for you and puts non smokers in greater risk BUT....

    That's BS. COX-2 is a protein expressed in the event of inflammation and cellular damage. It shows up in a variety of situations, and while it IS overexpressed in tumor cells, COX-2 does not CAUSE carcinogenesis. Rather, it appears that COX-2 overexpression is a necessary step in...
  35. H

    I saw a Ligar on TV

    Male Ligers are sterile. Females are not.
  36. H

    What schools do my fellow student ATOTers go to?

    Vanderbilt University
  37. H

    Do you consider this a challenging chemistry problem?

    Cake.
  38. H

    Linear Algebra geniuses come in...

    It's clearly symmetric, therefore it's diagonalizable, therefore its determinant is equal to the product of its eigenvalues, all of which should be positive in that. ...Maybe. That's what I get at first glance.
  39. H

    Math help (Diff Eq.)

    Laplace transform ftw.
  40. H

    I want to play with a room temp liquid metal.

    You're looking for one of a few metal alloys known for having super-low melting points. Pure Gallium has a melting point of around body temp (About 86 degrees F), and so will melt gradually as you hold it in your hand. There are, however, a number of alloys of Gallium that depress this melting...
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