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  1. O

    Engineering Technologies?

    Agreed - you won't get repect from the engineers, and if you want a loosy-goosy know-everything tech degree, go physics. Note that computer engineering (computer architecture, logic gates, digital electronics, automata) is very different from electrical engineering (signal processing...
  2. O

    Why do some rechargeable batteries work in MP3 players while others don't?

    I think your rechargables cannot deliver enough CURRENT (I), and hence enough POWER (P = I*V), at a their rated voltage (V), whereas NiMH can. A simple way to test is to buy a variable resistor (50 ohms to 5 kohm should be good enough) and hook it up to the battery. As you vary the resistance...
  3. O

    Camera Red Eye

    This article makes things clearer, but doesn't answer my original question. My eyes (greenish-hazel) are pretty dark. http://en.wikipedia.org/wiki/Red-eye Is it possible for humans to have a "tapetum lucidum"?
  4. O

    graphics comparison of low end laptop graphics

    Excellent links Conroy9!
  5. O

    Jumping

    About how much additional vertical should one expect with a running start, instead of off two?
  6. O

    Jumping

    OK so conservation of energy - but you're not jumping off a spring-board and our leg muscles are not elastic. Also at some point, if I run too fast, I cannot jump very high at all.
  7. O

    Jumping

    I don't know how many countless dreams I've had about flying like MJ and dunking, but have also wondered about the dynamics. When I was younger I could jump higher off two feet than after a running start. Nowadays, I jump just as high regardless of how. By the way, I get about 30" of vertical...
  8. O

    Latest word in laptop video GPU's?

    I have several questions, so let me just list them: o What is the latest word on the future of high performance laptop graphics? oo As a corollary to the former question, is better (in general) to get Intel integrated graphics, or a GPU supplied by a non-motherboard manufacturer? o Why...
  9. O

    Negative Pressure

    It is only through a pressure difference that you will have fluid/air transport.
  10. O

    Long skis

    This past weekend I saw a race advertised as the world's fastest non-motorized sport - speed skiing. They guys were doing 150+ mph on 60 degree slopes. One dude wiped at 151 mph. I noticed the length of their skis weren't the 210+ that a lot of experienced skiers boast, but instead more like...
  11. O

    Camera Red Eye

    Axnff- We are curious about the results from your 3 year-old's doctor visit. What is the red-eye reflectivity due to? My mother & I both get red-eye, but my father & brother do not.
  12. O

    Long second toe

    The gene for a long second toe is dominant, but I've also heard that it is linked to tallness. I haven't found sufficient evidence on google to draw any conclusions. What would Mendel say? Added July 20, 2005: I have enjoyed reading every single post here! Thanks to all you...
  13. O

    Camera Red Eye

    Flash photos of me invariably result in red-eye, even in moderate lighting. I have brownish-hazel eyes and I've noticed that some people are more prone to red-eye in flash shots than are others. I also wear contacts, but I've seen red-eye problems in those that don't. The problem seems to be...
  14. O

    super-fast mobile chips that sleep a lot

    If it was just a "few" milliseconds I wouldn't have a problem, but it's really like 500 ms, i.e. 1/2 second. And why does my cell phone take so long to hang up. As far as I can tell, it should instantly turn off and discontinue power usage. Maybe it's bad programming. My Palm m505 (now 4...
  15. O

    Copper Interconnects For CPU's-How bout Silver?

    Sixtyfour's posts up to this point have been mostly correct. I do IC design and gold is often used. In fact a lot of gold wire-bonding is done too, and that conceivably would also be "expensive". You guys have to look at the overall cost. Now aluminum is the traditional metal used. Gold...
  16. O

    Hybrid Motorcycle??

    I ride and there no way I'd want a heavy battery on my bike. That said, the fuel economy per weight ratio on motorcycles is dreadful. 40-60 mpg is typical. It was only relatively recently that fuel-injection was introduced in motorcycles. Engine technology is way behind the times compared...
  17. O

    Sun's surface temperature & halogen bulbs

    Anything sufficiently bright will wash out our perception of color. Even very very bright red will appear white. I don't think the sun's color being scientifically defined as yellow is dictated by how it appears after light passes through our atmosphere. The peak color of 550nm (being...
  18. O

    Sun's surface temperature & halogen bulbs

    Super-white halogen bulbs are advertised to be so white that they are bluish-white. The bulbs have a rated temperature from 3800K-4175K, and some go even higher. From physics we know that blue stars are hotter than white, white hotter than yellow, yellow hotter than red. If our sun's surface...
  19. O

    Measuring Poisson Ratio

    Here's an idea taken from Archimedes. Put your sample in water, or some liquid where you can measure its combined volume, apply a force, notice the change in volume of the water and with the help of some FEM tool for your arbitrary geometry, you should be able to extract some effective...
  20. O

    two way communication on two wires

    True, but I was referring to ANALOG signals, and electronics available during Alexander Graham Bell's time. I wonder if they had op-amps back then, of if they needed vacuum tubes for the amplifier/filter circuits. J/K regarding op-amps...
  21. O

    two way communication on two wires

    So you're saying that when I talk, I hear myself just as loudly as the person talking to me, or perhaps even louder?
  22. O

    two way communication on two wires

    Has anyone ever noticed that only two electrical lines are used for two-way simultaneous communication over an analog phone line? If one of them is reference, i.e. ground, how do they get incoming & outgoing over the other line?
  23. O

    Why is Interpolation in LCD so poor?

    I have been equally puzzled by this. CRT's seem to be good at outputting a decent image regardless of resolution, while an LCD that is displaying non-native is usually terrible, and so are LCD & DLP projectors.
  24. O

    Do you think that we will ever create something that is self-aware?

    I bothers me to no end that scientists try to discover, and get government support for finding "life", or rather create "life" -- when we repeat experiments that replicate what happened during earth's history to generate life, it so bogus without a definition for consciousness. And what with...
  25. O

    A riddle

    Yes, I also believe he was referring to radiative heat transfer, as opposed to convection or condution. My comments on emissivity and dependence of color remain, as they would affect emissivity, i.e. EM/radiative transport - the only form of heat transfer remaining in pure vacuum.
  26. O

    A riddle

    This comment is highly dismissive. The constant is the emissivity of the material, and equals (1-absorptivity), by definition. Emissivity is a function of electromagnetic frequency. "Color" does matter, but in a general sense. Think not just in our visible spectrum of red to violet, but...
  27. O

    Is entropy opposite of gravity?

    I liked the read. Gravity is mysterious, almost as much as entropy. Why togetherness, why disorder? There must be some mathematical conundrum that cannot be answered without some relationship here. What does string theory have to say?
  28. O

    A riddle

    Technically black is one that absorbs all colors, but what is "black" at radar frequencies may not be optically black. I think that with the right mix of nanoparticles (for example) the paint could be made black for one set of frequencies, and white for another set. Therefore it is remotely...
  29. O

    A riddle

    We often think of a perfect radiator of energy as being black, e.g. black body radiation, so why are stealth fighters and spy planes like the SR71 black? Added 3/25/2005 01:37PM (PST): It seems that for superfast planes like the SR71 the frictional heat they generate should be visible...
  30. O

    Time epsilon....

    My computer loses about 5 minutes a week: http://www.wired.com/news/culture/0,1284,42670,00.html
  31. O

    Time epsilon....

    It's interesting that accessing the quartz crystal oscillator which must be part of all computers requires a special OS. Certainly the BIOS must have access to it, otherwise it wouldn't be able to maintain time while the computer is off. For those of you using the computer to time external...
  32. O

    Music heard by animals

    Human appreciation of music seems so human, and I cannot imagine dogs or cats liking what we listen to. Since mp3's came out, music compressed for human ear models must sound somewhat odd to animals. Has anyone noticed a difference in how animals respond to music? Edit added March 22, 2005...
  33. O

    What is the Highest Temperature Possible?

    You may not need a supernova to create the high temps of fusions. Sonoluminescence anyone? http://www.nytimes.com/2005/03/15/science/15soni.html? Oh okay, that's what I thought. Dr. Pizza had me worried!
  34. O

    Is entropy opposite of gravity?

    If all of the universe's mass accumulates to pure energy, heat & entropy, does gravity bring it back to a single point to start the big bang process all over again?
  35. O

    What is the Highest Temperature Possible?

    This train of thought might lead to the right answer. Another related question is, what is the temperature of a photon?
  36. O

    White LED bike light: great visibility, mediocre illumination

    Yes NeoPTLD - a regular flashlight will have a more focused beam than an LED (typically). The halogen filament bulb is positioned near the focal point of a parabolic reflector, and movement (focus) of the reflector allows you to defocus/focus the beam. Hard to get 8 LED's in the same space...
  37. O

    White LED bike light: great visibility, mediocre illumination

    Wattage is the wrong rating here -- you need to look at lumens. With a halogen bulb a substantial amount of energy is dissipated as heat and non-visible radiation.
  38. O

    Netscape 8.0 Beta

    Through the very same about:config used to speed up Netscape, you can change the default search to google. I have done it once before on Netscape 7.1.
  39. O

    If you killed someone, how would *you* dispose of the body?

    Is the idea to dispose of the body completely, forever into posterity, or just for your lifetime so you wouldn't get caught. Anyways, I think a good 'ol industrial incinerator would work, but don't leave a trail of body hair.
  40. O

    60Hz vs. 50Hz.

    The reason you cannot see incandesent bulb flicker is because it does not cool down (dims) sufficiently between cycles, and the 60Hz actually delivers power at 120Hz. The nice thing about 60Hz is that it can be used to sync clocks. The accuracy at 60Hz is precise because power circuits are...
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