Jump to content
Science Forums


  • Content Count

  • Joined

  • Last visited

Posts posted by PuGZ

  1. It sounds to me as little more than one man stirring the pot in a bid to garner some interest for his latest book.


    While it is true that the majority of low-level (in terms of skill and application, not computer terms) programmers will never need to write their own algorithm, it's absolutely essential that they have an understanding of Big-O notation and the mathematics behind it. Without this vital knowledge, programmers will only ever accidentally stumble upon correct solutions to simple problems.


    Computer scientists - on the other hand - are not low-level code-monkeys and will always need a solid grasp on mathematical fundamentals if they are ever to make a useful contribution to the field.

  2. PuGZ,


    Deterministic free will has no sense, it is in contradiction of the definition of free will.

    It's not an illussion. Although we are influentiated by some things in the rest of the Universe (past experiences, others' thoughts, conditions in the environment, etc) we take our own decisions sometimes.


    If we would have a "deterministic mind" we would be machines and I don't think we are.

    Free will - Wikipedia, the free encyclopedia


    I'll expand upon this when I get home, but for now I'd advise that you read up on compatibilism and see why others may disagree with you regarding determinism and free will.

  3. Bonjour déjà tout le monde!


    J'avais lu mes e-mails et puis j'ai trouvé un email qui dit qu'il y a messages dans ce fil! Bien-sur, j'étais heureux! :turtle:


    À propos de claviers, j'ai un Macbook. Tous les Macbooks (au moins dans l'Australie) ont les claviers QWERTY, mais ce n'est pas un problème pour moi. C'est le cas parce que quand on utilise le "alt" et "e" à la méme temps, il le permis à créer un "é" ou "á", etc. On peut aussi utiliser le "`", "u", etc. C'est difficile pour moi à l'expliquer, mais j'éspere que vous me compris!


    Il y a quelque jours, j'ai dû faire un examen pour le français parlé - c'était dix minutes avec mon professeur seul. J'étais heureux à la temps car j'ai utilisé beaucoup de grammaire et vocabulaire, mais j'ai aussi hesité beaucoup et parfois j'étais muet pour au moins cinq seconds. :hyper:


    J'aime lire tout que vous écrivez, continuez s'il vous plait!

  4. I've never known anyone to be so fanatical about Australia online -- I love it! ;)


    The whole Dalai Lama fiasco was pretty poor. It's worrying that our leaders would almost rather pander to the Chinese than their own populace. At least common sense won out in the end.

  5. I'm still dependent upon my parents, so any money I do earn is more than I need! However - and I may be in the minority in saying this - I do not yearn for the big bucks. I'll be quite happy living on the median wage as long as I'm in my dream job doing the work that I've always wanted to do, surrounded by a family I love. I think a lot of people confuse money and wealth.

  6. I think mathematics education is an absolute mess in most western countries. We have kids that go through eleven years of schooling and can't fill out a tax return, can't work out the total for their shopping bill and can't split a bill. It is these skills in mathematics (and logical thinking!) that are so sorely missed by so many.


    While I can't imagine a life without higher maths (and I've barely scratched the surface, having not even finished high school yet), I am very well aware of what Michael is talking about. We're stuck in an old-school rut (excuse the pun) consisting of material meant for rote memorisation, but teachers don't have the power to force kids to learn the material. A reform is needed (in the Australian system, at least - I can't comment on the situation overseas) where the maths that is taught is more applicable to kids' daily dealings and hopefully more engaging to boot.


    Mind you, it's a lot easier said than done.

  7. Merci, nimzo. :shrug:


    Je suis étonné que autant gens pensent que j'écris bien français! Peut-être vous devez m'ecouter, et puis vous direz quelque chose differente. :confused: Je voudrais habiter au Québec ou nulle part où les personnes parlent français ou même si presque - ce serai plus facile pour pratiquer mon français parlé (Je pense que 'parlé' est le bon mot)


    Hier, j'ai un examen petit pour français - il faut écrirer au moins 250 mots et ne plus que 300 mots. Nous avons dû écrirer d'esclavage. Je suis heureux parce que j'ai utilisé le mot "dont" (par example; "c'est l'homme dont le fils m'a promis qu'il m'aidera..") C'est petit, je le sais, mais je suis heureux. :eek_big: Malheureusement, j'ai écrit plus que 370 mots, donc je crois que mon professeur me lui punirait. :eek2:


    J'ai grands examens tôt pour le physique donc je dois étuider. A bientôt!

  8. Mean time between failures - Wikipedia, the free encyclopedia :

    MTBF is not to be confused with life expectancy. MTBF is an indication of reliability. A device (e.g. hard drive) with a MTBF of 100,000 hours is more reliable than one with a MTBF of 50,000. However this does not mean the 100,000 hours MTBF HD will last twice as long as the 50,000 MTBF HD. How long the HD will last is entirely dependent on its life expectancy. An 100,000 MTBF HD can have a life expectancy of 2 years while a 50,000 MTBF HD can have a life expectancy of 5 years yet the HD that's expected to break down after 2 years is still considered more reliable then the 5 years one. Using the 100,000 MTBF HD as an example and putting MTBF together with life expectancy, it means the HD system should on average fail once every 100,000 hours provided it is replaced every 2 years.


    That ought to clear up a few misconceptions stated in the thread so far. That said, I believe that most twentieth century computers will still be functional two hundred years from now -- provided that they are stored in a vacuum. Given regular use, I can't imagine most lasting more than a quarter of that!

  9. I would be interested in seeing comparative statistics for ads that say:


    Drive-By Download

    Is your PC infected?

    Get virus-free here!



    People must be desensitized to advertising to the point of clicking for the sake of curiosity when something new comes along.

    I would click the banner just to test my system's defenses.



    Why'd you jump to that conclusion? I've become so desensitised to advertisements that I rarely notice their existence, let alone click on them. While I've always thought the same applied for most people, first-hand evidence (read: immediate family members) suggests that what you say has merit. I wonder about some people.. :confused:

  10. I recently bought the Nokia N73. I use the camera even more than I use the phone functionality (especially on trigger-happy holidays!) and the calendar is exceptionally useful. I keep all my dates and contacts on my Mac and iSync keeps everything in sync so I just need to look at my phone on standby to know what I've got coming up throughout the week. Very handy. :D

  11. Bonjour sanctus! Merci pour vos mots gentils! :yay_jump:


    Premierement, j'ai reçu la message privée, mais je n'avais assez attendu! Parfois je suis impatient. :bow_flowers:


    J'ai bonnes nouvelles! Ma cousine vient de recevoir un diplôme avec "first class honours" (je ne sais pas les mots en français!) en français de l'Universitaire de Glasgow en Ecosse! Nous sommes tous très fiers d'elle, bien sur. :woohoo: Sa mère est une professeur de français et sa tante est aussi une professeur de français (et l'espagnol) et elle parle français chez elle, mais c'est encore un grand accomplissement. Quand elle avait dix-huit ans, elle a gagné un récompense parce qu'elle était une de la trois mieux francophones en Grande Bretagne.


    ...Quelquefois je bien voudrais que je n'habite pas en Australie, ca veut dire apprendre la français plus facile. :beer-fresh: En tout cas, il faut faire les devoirs - A bientôt!

  12. Yeah - d'oh - that's what I thought of this morning as I was in the shower. :) (I posted it last night). I'm almost certain that is the case now (and it makes sense, for the reason you stated) but I'll leave the question open in any case anyone wants to confirm it.


    EDIT: The reason I dismissed it at first is because I know satellites are only ever in free fall, but due to the curvature of the Earth they never land? Or do they have a horizontal velocity component? (Relative to the surface of the Earth).


    The more I try to justify a particular reason, the more confused I get.

  13. Hi guys,


    I've just recently got the results back for a Physics trial exam and I'm curious about something. I'll first show you the question and then my queries in regards to it.


    The Keyte I satellite has a mass of 83.6kg. It orbits at a height of 690km with a period of 98.6 minutes. The graph below shows how the gravitational field strength depends on distance from the centre of the Earth.


    Hence there is a graph with a curve in the shape of the right side of a hyperbolic graph. On the horizontal axis is distance from the centre of the Earth (m) and on the vertical axis is gravitational field strength (N/kg). Two points are labelled: (6.38 * 10^6, 9.81) and (7.07 * 10^6, 7.98). These are the values for the Earth's surface and the radius of the orbit, respectively.


    The first question is such:


    Calculate the kinetic energy of Keyte I in orbit (assume a circular orbit


    Kinetic Energy [math] =\; \frac{1}{2}mv^{2}[/math]


    [math]m\; =\; 8.36\; \cdot \; 10^{1}[/math]


    [math]r\; =\; 6.38\; \cdot \; 10^{6}\; +\; 6.9\; \cdot \; 10^{5}\; =\; 7.07\; \cdot \; 10^{6}[/math]


    [math]G\; =\; 6.67\; \cdot \; 10^{-11}[/math]


    [math]T\; =\; 5.916\; \cdot \; 10^{3}[/math]


    [math]v\; =\; \frac{2\pi r}{T}\; =\; \frac{2\pi \; \cdot \; 7.07\; \cdot \; 10^{6}}{5.916\; \cdot \; 10^{3}}\; =\; 7.5\; \cdot \; 10^{3}[/math]


    Kinetic Energy [math]\; =\; \frac{1}{2}\; \cdot \; 83.6\; \cdot \; \left( 7.5\; \cdot \; 10^{3} \right)^{2}\; =\; 2.35\; \cdot \; 10^{9}\; J[/math]


    The second question is such:


    Minimum amount of energy required to place Keyte I in its orbit


    Area under graph = N * m / kg = J / kg

    Therefore, if we multiply the area under the graph (estimated to be 6.13 * 10^6 using trapezium) by the mass of the satellite (83.6 kg) we should end up with 5.13 * 10^8 J of energy.


    Apparently this is the wrong answer because we forgot to add the energy from the previous question. Why would this be the case? My textbook has a very similar question, but the question is worded "how much work should be done against gravity to launch the satellite?"


    Thanks for the pointers, Hypography. :D

  14. If you are studying the two languages and enjoy them, have you considered studying Linguistics? In that field you could combine scientific rigour with human languages and really go anywhere!


    Best of all (in my mind, at least), there are some very large, meaty problems that remain unsolved to this day and would be incredibly pertinent to society if they could be solved. Of course, I'm talking about natural language parsing and translation. With an abstract mind, you would do very well at separating syntax from semantics - which is exactly what such an endeavour would require of you.


    Just another option to consider. :evil:

  • Create New...