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  1. alcalder

    Cool Physics Video

    You are right, just amazing!!! Love them.
  2. alcalder

    Teachers who highjack ur major work

    Sounds like you have a teacher who does not know how to edit. Sorry about that. A good editor does not try to change the voice of the work but helps correct the mistakes that scream "amateur". If you want a non-biassed, non-taking over opinion, I'm here ;) But in any case, keep arguing OR...
  3. alcalder

    Engineering Jokes

    And some more??? There was an engineer who had an exceptional gift for fixing all things mechanical. After serving his company loyally for over 30 years, he happily retired. Several years later the company contacted him regarding a seemingly impossible problem they were having with one of their...
  4. alcalder

    International Travel

    Yes: Europe - Switzerland, Germany, Italy, Austria, Slovakia, France, England, Wales, Scotland, Belgium, Monaco, Vatican City USA, New Zealand, Norfolk Island (it's over the sea!), Singapore, Malaysia, Hong Kong stopovers only in Thailand and Japan. Yes, back to German speaking countries and...
  5. alcalder

    ROYGBIV or VIBGYOR

    Man, does this survey qualify for an entry in the "You *know* your Physics nerd when..." thread!!! But ROYGBIV, all the time. I was just taught it that way.
  6. alcalder

    You *know* you're a physics nerd when...

    Hee hee. I just had to add this one. You argue in a topic called "You *know* you're a physics nerd when..." about the number of commas and how nerdy you are. ;) And from somewhere esle I posted: You are being pulled down a hill by your shopping trolley and you are contemplating the vector...
  7. alcalder

    Falling behind.

    If worst comes to worse and you cannot see yourself catching up in every subject, rather than fail everything and then spend a whole year doing them ALL over again at TAFE or something like that, perhaps it is worth speaking to the HSC advisor at your school and see if you can do Pathways and do...
  8. alcalder

    the BEST thing about ... PHYSICS!!!! (oh and the worst thing?) LOL

    Ah, vectors. I remember them fondly. But now I look upon them as an everyday thing, especially when I am navigating my shopping trolley down a sloping hill towards the car park. (Truely, I do. Maybe that should go in the "You know your a Physics Nerd when..." thread. hee hee)
  9. alcalder

    Help~~~plz~~~2 Machanics Qs

    Actually, the diagram for both is the same. In the first, mass A hangs vertically, in the second, mass B hangs vertically. Anyway, in question 1. On mass A there are two forces: FGravity = -mg (ie down) FString Tension=T (ie up) Add the forces and the mass is stationary so resultant F=0...
  10. alcalder

    Yr 11 German Listening Skills

    I did German at Uni and School. Watatank is correct. Listen to as much German as you can. Try and watch German shows on SBS, catch the German news on SBS radio if you can, or get someone to tape it for you. You can stream it off the internet as well. That can be good to do, because then you can...
  11. alcalder

    Cathode rays and aether

    Cathode rays were once thought to travel through the ether. http://www.aip.org/history/electron/jjrays.htm http://nobelprize.org/nobel_prizes/physics/laureates/1905/press.html However, I cannot see how they disprove it. You may have got a tick because the teacher did not know for sure. ;)
  12. alcalder

    Some questions on semiconductors and transistors

    The old paper Dick Smith Catalog was my constant companion while doing Electrical Engineering at Uni :D
  13. alcalder

    determining speed of a motor

    This is a strange question. What is the actual question?
  14. alcalder

    experiments

    One place to bookmark and refer to often is this palce: http://webs.mn.catholic.edu.au/physics/emery/accuracy.htm Always remember, accuracy, reliability and validity.
  15. alcalder

    Electricity Assignment

    Well, let me see, this is a first aid issue, in some respects. Here are some websites. There is a warning on the first one. It has some graphic pictures that illustrate the danger of electricyt on human flesh: http://www.osha.gov/SLTC/etools/construction/electrical_incidents/burns.html...
  16. alcalder

    what is a positve hole

    When an electron leaves the lattice it leaves behind it a hole. So, the negative lectron leaves a positive hole. Because another electron will jump from further back in the lattice to fill that hole, you could say that the positive hols moves in the opposite direction to the electrons. Does...
  17. alcalder

    Some questions on semiconductors and transistors

    A boost in aq direction would be to check out the Dick Smith catalogs. They have lots of great technical info on transistors and other components. http://www.dse.com.au/cgi-bin/dse.filereader?464da53301c6c530273fc0a87f9c06fd+EN/catalogs/CTG0000622...
  18. alcalder

    please help physics question thanks all

    These two cannons will both travel to the same spot (if we consider nil air resistance). However, the one fired at 50 degrees goes higher into the air than the one fired at 40 degrees and so will hang in the air a bit longer than the other one and thus will have a longer time in flight. Does...
  19. alcalder

    Help

    OK, Eddy currents. Think of it this way. If you move a wire in a magnetic field, it induces a current in it. An eddy current is just that sort of thing BUT it is not in a wire but in a larger piece of metal and so the current has to circulate around inside the metal. So, inside a transformer...
  20. alcalder

    the BEST thing about ... PHYSICS!!!! (oh and the worst thing?) LOL

    BEST: New concepts, new maths, new ideas. WORST: New concepts, new maths, new ideas. It's a double-edged sword. But there must have been more good than bad for me to go and want to become a physics teacher :D
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