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Chronofox last won the day on May 4 2011

Chronofox had the most liked content!

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    May 2012
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  1. I hate how Option G doesn't have any worked solutions on Tsokos' website. Here's one that's been bothering me: The index of refraction for blue light of wavelength 4.5 * 10-7 for a particular kind of glass is 1.328 and for red light of wavelength 6.5 * 10-7 it is 1.321. White light is incident on an equilateral triangular prism made of this glass parallel to one of its bases. What are the angles that the blue and red rays make with the normal as they emerge from the prism?
  2. A bit of a psychology-TOK blend here. My class just watched 12:01 PM, an extremely thought-provoking film about a man stuck eternally in a time loop that not even death can help him escape from. It's gotten me thinking about what the longevity of life and the universe means. Mortality and death is something that everybody fears. However, in a way, it's also something that gives meaning to our lives. If humans were immortal, then every moment would be rendered completely meaningless. There's a saying that, as you get older, time seems to fly by more quickly. This is because we've already "exper
  3. HL History is really interesting, actually. I recommend taking one HL science and one HL humanities to make your education well-rounded
  4. It depends on what you want to get into. If you wish to go into health or life sciences, then HL chem and bio isn't a bad choice.
  5. After using a motion sensor to acquire the velocity-time graph of a cart, I opened up the graph in logger pro and saw that the uncertainty of each value of velocity was ± 0.001 (three significant digits). However, after linearizing the graph, the slope had an uncertainty of ± 0.0001 (four significant digits) which as presented by loggerpro. So in this case, do I put acceleration down as having ± 0.001 uncertainty or ± 0.0001?
  6. Two questions have me stumped. For the question below, I have no idea where to begin. "When the sand hits the conveyer belt, its speed is zero." What does that mean?
  7. Hooke's law, F = -kx, suggests that the relationship between the force applied upon an object and its extension is linear. However, when I conducted an experiment, the results that I acquired were more indicative of a logarithmic relationship. With 0.05 N of force applied, the extension was 1.2 cm. By increasing the force, the increments of each increase in extension slowly decreased. This was true of three different trials. Is this supposed to happen (why?), or could there be systematic / accuracy errors resulting in these measurements
  8. Best way to study is to do past tests. If your teacher doesn't give you enough homework, then find extra questions to do (provided that you understand all of the concepts in the curriculum first, of course).
  9. Well... How would you solve it if the mirror was concave, anyways?
  10. Converging lens, convex right? The only way to get a virtual image with one is to have the object inside the focal length and for it to be twice as big it needs to be at the 0.5f mark I think. But then you said concave in your next part? I'm so confused Converging is actually concave.
  11. A converging mirror has a focal length of 15 cm. Where would you place an object in order to produce an erect virtual image twice as tall as the object? So using the magnification formula for concave mirrors, hi / ho = -di / do (where i = image and o = object), I get that hi / ho = 2, so that means -di / do must equal 2 as well. What do I do next?
  12. Was forced to turn off their eco-friendly wind turbines after it apparently generated too much electricity for the country's grid network to sustain. http://breakingnews.heraldscotland.com/breaking-news/?mode=article&site=hs&id=N0215511304251519691A What does this say about the efficiency of renewable energy-producing resources?
  13. "The temperature of Heaven can be rather accurately computed. Our authority is Isaiah 30:26, "Moreover, the light of the Moon shall be as the light of the Sun and the light of the Sun shall be sevenfold, as the light of seven days." Thus Heaven receives from the Moon as much radiation as we do from the Sun, and in addition 7*7 (49) times as much as the Earth does from the Sun, or 50 times in all. The light we receive from the Moon is one 1/10,000 of the light we receive from the Sun, so we can ignore that.... The radiation falling on Heaven will heat it to the point where the heat lost by
  14. Yes. The only restriction on exams is a 24 hour time period after the exam is given for that session. Okay. My question is: f(x) = ln|x| + i[arg(x)] for 0 <= arg(x) <= 2π And I have to prove that f(x1x2) = f(x1) + f(x2) is not always true. Well, the first part of the questions asks you to solve for x = 1 - i and x = -1 + i. f(1 - i) = ln|1 - i| + i[arctan(-1)] = ln√2 + i(3 / 4)π or π ln√2 + i(7 / 4)π f(i - 1) = ln|i - 1| + i[arctan (-1)] = ln√2 + i(3 / 4)π or π ln√2 + i(7 / 4)π Since this is paper 1, no calculators are allowed and thus I don't think the equation can be simplified any fu
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