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Everything posted by Dave
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Pretty crappy way of sterilising it. But then again, they did thing tobacco and cigarettes were good for your health, so who knows?
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There's a little thing called the Heisenburg Uncertainty Principle stopping you; it basically says that you can never know both the velocity and position of a particle at any instance in time. alext87: half-life is still only an approximation. There's absolutely no guarantee that after x number of hours the radioactivity will have halved exactly (which is what you're after). You've got to realise that 1) there's far too many variables for all the computers in the world to calculate trajectories of particles 2) it's impossible anyway and 3) there may be objects/collisions that we just don't know about. Even if we overcame those obsticles, we'd need to obtain the starting 'values' for every single particle, so overall it's theoretically and physically impossible.
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cardinals and transfinite induction
Dave replied to MandrakeRoot's topic in Linear Algebra and Group Theory
Sorry, it's still quite a bit too advanced for me. I don't know whether there's anyone else that has an answer to this question, but I'm sure it'll be answered (in time) -
http://dictionary.reference.com/search?q=ecosystem
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In short: don't trust everything your calculator tells you
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You say 'everything has a pattern'. This is not true; there are some truly random events (for example, radioactive decay). Even if everything did have a pattern, it wouldn't really qualify as time travel, rather future predictions based on known events. This already happens in weather forecasting, and they don't usually get it right. Even in a mathematical sense, you can't state a theorem and prove it from lots and lots of evidence; you have to prove it completely from a logical standpoint.
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One of the numerous equations for working out the area of a triangle is 1/2*a*b*sin(theta), where theta is the angle between the two sides a and b. If you use this formula, it's pretty easy to find the side length: i.e. 1732 = 1/2*a2 sin(60) Re-arrange it a bit, and you should get a to be sqrt(1732*4/sqrt(3)) = 63.24 cm. (this is basically the same approach as the one jordan mentioned, only without the simultaneous equations).
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To be fair, the guy did stop posting quite some time ago. If he's good enough to produce a good hoax (he's obviously put a lot of effort into this), then you're probably not going to egg him on by ignoring him. Plus this created a pretty big effect anyway - the fact that we're discussing this on here is testimony to that.
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I believe she used to carry a lump of radium around with her, and so she died of either radiation poisoning or cancer.
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http://www.theregister.co.uk/2004/04/09/longhorn_overboard/ They're looking at 1st half 2006 for a release.
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1. tan(A-B) = (tan A - tan B) / (1 + tan A tan B) So tan(u-w) = (tan(u) - tan(w))/(1+tan(u)tan(w)) = -3/2 / 2 = -3/4. 2. Number of combinations for one column = nCr(10, 5) => total number of ways the switches can be set = 2*nCr(10, 5). Can't be bothered working out nCr(10, 5) though 3. Just work out the co-ordinates of the centre of mass of the triangle (assuming its density is constant).
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Just needs a bit of patience
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Interestingly, he says that the US is in the middle of a civil war in 2005, which given the current state in Iraq and the total political mess it's causing I can actually see happening.
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http://www.johntitor.com/ I'm dubious to say the least - quite rightly to be fair. If someone came along and told me they were from the future I'd probably just think they were a nutter.
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To be fair, it wasn't proper red bull, I had to get Tesco's own brand 'kick' - which is basically the same stuff and they had it on 2 for 1, unlike red bull which was about 4 times more expensive. Being a cheapass student with no money, I went for the former ;-)
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My maths degree is pretty much the same. The amount of work I had to do for the second semester was far greater than that of the first. I think it happens more or less everywhere, but as sayo said, if you're worried about it, see your personal tutor.
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What happened to the reputation system?
Dave replied to aommaster's topic in Suggestions, Comments and Support
I personally believe we're probably better off without it. -
It's a common belief that he wasn't good at math - however, he'd had quite a lot of schooling in the field, and believe me, if you look at some of the stuff, you'll understand that he knew what he was talking about.
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OMG: Tell This Chiken to do anything, it will do it.
Dave replied to bloodhound's topic in The Lounge
I really don't think they'd employ a guy to stand there wearing a chicken suit 24 hrs a day to dance around for a cheap laugh on a website. -
Not 21 yet, but my 18th was fun. Went to a restaurant with a bunch of mates, had a very nice meal, went back to mine and drank copious amounts of alcohol (they kicked us out the pub, the gits). Went to bed at 5, woke up at 9, then at 3 went over to another mates house for another party, drank copious amounts of alcohol, then went for a walk at 1:30am getting back at 4am in an effort to find food with a couple other guys. Then kepy myself up until 8pm that night so my sleeping didn't get disturbed too much. Also found out what the effect of drinking 2 litres of red bull in about 3 minutes does to you
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Try 'addressing' a kid and you'll find out why this doesn't work.
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Nice to see we've got some more people posting in the math forums
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It's one of the most famous proofs by Euclid, showing that there's an infinite number of primes. It uses the FTA to show that if any number a = p1p2...pn then the number p1p2...pn+1 must be composed of some primes which are not p1 etc. (At least that's the general jist of it)
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It's a little beyond the level of my understanding, but here's a link that might help: http://mathworld.wolfram.com/LobattoQuadrature.html