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    May 2015
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  1. God

    Anyone here good with electronics?

    Would you say it was easy to learn using the arduino and learning how to program in C?
  2. So I'm done with IB, and I'm pretty bored at the moment until I go to uni. I want to learn how to make cool stuff with electronics, and i don't think Physics HL taught me very much. I am wondering if anyone is good with electronics. How should i further develop my knowledge in electronics after IB physics? I want to actually make stuff but i don't know where to start. A lot of the stuff on the internet look pretty complicating. Any got any ideas? thanks! GOD
  3. God

    Physics HL...How difficult is it?

    In my opinion physics HL was one of my easiest subjects just because I found it so interesting. You don't even need to be good at maths to do physics, because mostly all you do is rearrange equations. Math HL is also not as hard as people said it would be (still pretty hard though) . In my opinion, you should start with math HL, and you can always drop down to SL if you want to later on. My mistake was that I first took SL, and only after a few months took HL maths, so i had a lot of catching up to do. remember, just cause its hard for someone else, doesn't mean its hard for you, so just at least try it.
  4. I need to come up with ways in which imagination is in Mathematics. I think that axioms were created by people by using their imagination. However, i do not know how to explain how i know imagination is used. Anyone have any ideas to help me explain it? Axiom: Self-evident truth that requires no proof. For example one of Euclid's Axioms: Things which are equal to the same thing are also equal to one another. Thanks!
  5. God

    Hypothesis in EE

    Nickname? Its okay, i forgive you.
  6. God

    Hypothesis in EE

    Just some questions about hypothesis in my Physics EE. Do I even need a hypothesis? If i do have one, should i explain the hypothesis, like using equations and stuff to prove it? I don't think I've seen Phyics EE do this, most of them just state it very briefly. Do i need a null hypothesis? or doesn't it really matter? Can i have more than 1 hypothesis? Thanks bru's! - God
  7. God

    How to memorise everything?

    Try memrise.com It pretty useful for memorizing things because its like flashcards, except it often repeats previous questions. I cant really explain, but you should try it. You can make your own, or use someones else's. -GOD
  8. i see similar questions come up quite often: The random variable X follows a poisson distribution. Given that P(X<=1) = 0.2, find the mean of the distribution. <= is less than or equal to. so i try to rearrange and i get to : e^-m (1+m) = 0.2 I dont know what to do next, anyone know ? Thanks! -GOD
  9. God

    Drop Math HL or not?

    I am also considering dropping Maths HL, but I am taking 4 HL's. I am only gonna decide to drop it after the winter break. I think you should take HL in one more subject and maybe do the same? -GOD
  10. God

    Physics EE Experiments

    Thats a pretty cool idea actually, Thanks! So you don't think i need to film it in slow motion right? and how would i know how many frames it is? Is there a program that could help me with that? Yea, i'm not really good with computer stuff.
  11. Im doing my EE on Blowguns, and i need to measure the speed of a dart. Would anyone have any idea of doing that without any high-tech equipment? Taking a time with a stopwatch is very inaccurate if not impossible. What i was thinking was firing it into foam, or another material and seeing how deep it penetrates in. Then is there another way of finding out the relationship of the penetration and the speed through another experiment? It would be great if someone could help me out Thanks!!! -God
  12. God

    Help with derivatives

    Well, i should be able to help: 2(16x2)1/2 first outside brackets: 0.5 x 2 = 1 and 1/2 -1 = -0.5 so: 1(16x2)-1/2 then because of the chain rule you gotta multiply that by the derivative of 16x2: (16x2)-1/2 (32x) = (32x)/(16x2) I think that I suck at explaining, and I'm not even sure if I am correct, but I'm pretty sure I am.
  13. I am just wondering if i can use hypergeometric distribution in a certain way. Lets say there are 10 balls in a basket: 5 blue, 3 green, 2 red. I am going to pick out 4, and i want to find the probability of picking out 2 reds, 1 green and 1 blue, in any order. So it could be RGRB, or BRRG, etc. Could i find the probability by first finding the probability of getting 2 reds out of 4 picks using hypergeometric distribution, then 1 green out of 4, and then 1 blue out of 4. Then i would add the probabilities together? It would be great if anyone could help me out, thanks!
  14. Lets say you are playing poker playing against 2 other people. Everyone gets 2 cards first and your 2 cards are a pair of X's. 5 more cards are going to come in the middle, and I want to find the probability of getting a full house. would you agree that these are the possible combinations of 5 cards?: YYYKM XYYKM YYYKK XYYKK XYYYK Where X is the rank of card that i have a pair of in my hand, Y, K and M is any other rank. from each of those combinations i find the amount of combinations possible. eg: for XYYKM i would do 13C1 x 2C1 x 12C1 x 4C2 x 11C2 x 4C1 x 4C1 = 1,647,360 possible combinations And when i add all of them up, i would get 1,857,024. Can anyone please just tell me if i am doing it correct? because i think in my answer i havent actually considered 4 cards missing from the other 2 people. Thanks
  15. Thanks bro, that actually helped me. That hypergeometric distribution thing is pretty cool too. i did get a slightly different answer though : 20.7%. However, I used hypergeometric distribution for working out all 4 of the probabilities P(A | D)*P( C | A and D) + P(B | D)*P(C | B and D). And it is assuming that i get dealt 2 cards first, and then the other 2 people are dealt 2. I would really like to know how you worked out P(A | D) and P(B | D). Also, can you please tell me how you got from P( A and C | D) to P(A | D)*P( C | A and D). I don't see it in the formula booklet. I would really appreciate your help again, or anyone else's! Thanks! -God

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