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CocoPop last won the day on July 16 2010

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About CocoPop

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    IB Survivor

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    May 2010
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    United Kingdom

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  2. Just found this online paint tool so decided to use your problem to test it out
  3. You're close, but if you differentiate (1/3)arctan(u/3) you get (1/3) * 1/((u/3)^2 + 1) * (1/3) = 1/(u^2 + 9) - use the chain rule. If you'd like to know where arctan comes from in the integration, you need to substitute u/3 = tan(theta). Can't be bothered to write it out in text, so I've done it on Word and screenshotted:
  4. It's true that you'd be hard pressed to find financial aid whilst applying to Oxford, but many colleges have generous bursary schemes that you will be able to apply for when you get there. You'll usually have to write an essay or something of that sort...
  5. This is true, and you can find a full list of schools that have this policy here: There are a few big ones like Yale that allow you to take ACT + Writing as a substitute for SAT I + II.
  6. The American guy at my college did 18 APs and got 5s in all of them. He even did some of them in year 10. Whilst I'm sure he's a very smart guy, I doubt one would be capable of taking the equivalent number of IB subjects, even over a four year span. By contrast, it's not unheard of to hear of people taking ~10-15 APs. EDIT: Also, putting an AP vs IB poll on an IB forum will probably get a fairly biased response!
  7. 18
  8. I can only work out a), because i'm doing Dynamics right now. b) F = m(v-u)/r = 0.55(11-0)/(150*10^-3) = 40.3N c) i) The ball's movement is restricted to a circular motion due to the string. This causes a centripetal acceleration with force F=mv^2/r which causes an increase in tension in the string. c) ii) T = mg + mv^2/r = 0.55(9.81 + 11^2/7.5) = 14.3N.
  9. I don't know why I'm taking a break from studying by doing more physics, but here's a quick go. a) Equate maximum kinetic energy (1/2*m*v^2) and maximum potential energy (mgh). Maximum velocity occurs when h=0 (where h is measured from the rest position) and your answer should round up to 11. b) Force equals rate of change of momentum. F = m(v-u)/t. v = final velocity = 11. u = initial velocity = 0. t = 150ms. c i) Centripetal force. c ii) Resolve forces due to weight (mg) and centripetal acceleration (mv^2/r). EDIT - Since the string is vertical this is quite simple. Just add the forces.
  10. You don't actually need to do the derivation to work that out. It should be clear from looking at that expression that the answer is zero. The reason: axb is going to give you a vector perpendicular to a, let's call it vector c. When you take the dot product of vector a with this vector c, the angle between them (say, theta) is 90 degrees. So the cos(theta) term will be zero hence the dot product will also be zero. Haven't done probability in ages, but here's a quick stab at it (looks like an infinite geometric series). You wan that player A gets the first six. So you could have the following combinations: - six - not six, not six, six - not six, not six, not six, not six, six - not six, not six, not six, not six, not six, not six, six And so on. The probability of not getting 6 is 5/6. The probability of getting six is 1/6. So we have that the probability of A getting the first six is:
  11. The Pearson Baccalaureate book is great, as well as the Study Guide (red one) for revision. If you want more detailed explanation you can give the Cambridge Tsokos one a try (purple book), but honestly that book made me want to shoot myself. Sure, it's detailed. Too detailed. It goes WAY overboard with excessive explanations, and rather than making you understand things better you get even more confused. Only give this one a try over the summer, otherwise you'll waste too much time racking your brain over unnecessary details. /rant over Conclusion: get Pearson Bac + Red Study Guide.
  12. The Haese and Harris one is decent, but a little too simple at times. The IBID book provides more realistic examples - I liked that one quite a lot. It had good, detailed explanations as well. The Cambridge one was alright for my option (Series and Diff.) if not a little excessive.
  13. The feeling after you put down your pencil in your last exam can be summed up as follows: AAAAAAAAAAAAAAAMMMMMMMMMMMMMMAAAAAAAAAAAAAAAAAAAAAAZZZZZZZZZZZZZZZZZZIIIIIIIIIIIINNNNNNNNNNNNNNNNGGGGGGGGG!!!!!!!!! Just think about that feeling. And how good it will be. It will keep you going. Good luck!
  14. Indian food! (8) And about to have pasta for dinner (definite 10 prediction, been craving it all day!)
  15. It's worth pointing out that Harvard does NOT require 3 SAT tests. The undergraduate class of 2014 were the last to have that requirement ( In fact, the vast majority of universities don't require 3 SAT subject tests. MIT, Stanford, Harvard, Yale, Princeton (who also changed it from 3 to 2), Berkeley etc. all only ask for 2 subject tests. However, it's worth doing 3 and sending the best 2 results, because many universities allow you to choose which subject tests to send, and if all 3 scores are good then that will give you a competitive advantage. My advice would be to take World History, Chemistry, Maths 2 and Maths 1 (if possible - the max number of tests you can take in one sitting is 3): - World History I have little experience with, but since you're taking History HL and you say you didn't find the SAT II too hard, definitely take it. - I took Chemistry SL and did the subject tests with a day of preparation (I don't recommend this) and got 720 (although that seems like a high score, it's only in the seventy-something percentile!). The problem was that the test covered some HL material that I should have looked over beforehand. You also have to be very quick with calculations - they aren't difficult calculations once you get used to them, but you'll have to do some extra practice beyond your IB work. - You should only be doing Maths 1 if you're taking Maths Studies SL. If you're taking Methods SL it shouldn't be impossible with a bit of extra reading and revision (some topics aren't covered by the IB such as polar coordinates). The difference is that you can get 4-5 questions wrong in maths 2 and still get 800, but make 1 mistake in maths 1 and your score will probably drop to 770-790. So if you're prone to making mistakes you might do better in maths 2. Try both and see which one turns out better. - I don't recommend you take a language subject test if you're not great at the language. I got a 7 in French B SL but only got in the high 600s in my subject test. Just take lots of subject tests from early on and keep repeating! I got 800s in maths 2 and physics in my first sitting by chance. I screwed up French like crazy, but it meant that I could stop worrying about 2 of my tests - huge relief! Then tried chemistry and french again in my next sitting because I NEEDED 3 subject tests. Just make sure you don't waste time and end up realizing you've got 1 sitting left before applications. Usually if you're applying RD universities will let you send January scores (with the exception of the University of California). Ok, I'm babbling! With enough practice it should work out fine! Good luck, and let me know if you have any more questions!