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  1. TurtleMeister

    Stargazing Macroscopic Dark Matter Revealed By Lightning

    @phinds Apology accepted. I too was skeptical when I first read about this because like you I was thinking that dark matter cannot clump. But as others have mentioned, this is not about traditional dark matter. For those who are viewing the video, the disputed phenomena accurs at about 0:37...
  2. TurtleMeister

    Stargazing Macroscopic Dark Matter Revealed By Lightning

    Well, I'm no expert on this but from what little I've read macroscopic dark matter is just what the name infers, dark matter that is not just single particles but has macroscopic form. Such an object interacting with the earth would be, for lack of a better term, a dark matter meteor or...
  3. TurtleMeister

    Stargazing Macroscopic Dark Matter Revealed By Lightning

    Hi Dave. Yes, I remember that you disagreed. I too was skeptical when I first saw the video. However, after close analysis I could see that the light was coming through the foliage. The light turns green right at the bottom of the streak. That could be caused by the strike being very close to...
  4. TurtleMeister

    Stargazing Macroscopic Dark Matter Revealed By Lightning

    This paper suggests that macroscopic dark matter could leave a trail of ionized plasma as it passes through the earths atmosphere. If this happens during a thunderstorm it could trigger a lightning strike that follows that trail. https://journals.aps.org/prd/abstract/10.1103/PhysRevD.103.063024...
  5. TurtleMeister

    Why does a capacitor charge to 63% of the applied voltage?

    Thanks. That helps a lot. I'm not a math person and only use it as a means to an end for whatever I'm dealing with. I had heard of Euler's number before, and even unknowingly used the concept in calculating compound interest, but never studied it. So my guess about it being an irrational number...
  6. TurtleMeister

    Why does a capacitor charge to 63% of the applied voltage?

    I understand your question, but I don't know the answer. I'm only responding because I find it interesting. It could be that this is just one of those "why" questions that physics is not very good at answering. Keep in mind that the 63% is an approximation. I don't know, but I suspect, that it...
  7. TurtleMeister

    Voltage across a Capacitor More than the Source Voltage?

    DC power supplies can have a certain amount of ripple, spikes, and noise in their outputs. If you have only a capacitor without any load on the output, then the capacitor will eventually charge up the the maximum, or peak value, of the ripple, spikes, and noise. Two volts is a lot but not out of...
  8. TurtleMeister

    Television Engineering History

    Back in the early 1970's I took a correspondence course in color tv servicing from NRI. If you looked at Jim's link to the Radio Electronics magazine issue you may have noticed one of their advertisements, which was usually included in every issue. One of the things I remember learning about in...
  9. TurtleMeister

    SpaceX SpaceX Falcon Heavy Launch

    The return and safe landing of the side boosters was fascinating. This video shows how fast they're coming down before the rockets fire. Best if you use full screen with headphones.
  10. TurtleMeister

    SpaceX SpaceX Falcon Heavy Launch

    This is great news. It's good to see this type of thing back in the mainstream news. Talk about the launch being at the same pad as Apollo 11 brings back memories. I was there in person back in 69 to watch it. I still have vivid memories of the sights and sounds.
  11. TurtleMeister

    Trouble with getting AM reciever to work

    That's an interesting circuit. Is it your design, or where did you get it? This takes me back to my younger days when I would spend many hours experimenting with simple am receiver designs. However, I didn't have IC chips or SPICE. Just a junk box.
  12. TurtleMeister

    Trouble with getting AM reciever to work

    Here's a close match to your circuit (if you move the diode to the front): http://www2.ensc.sfu.ca/~ljilja/ENSC220/Labs/lab_5.html
  13. TurtleMeister

    Trouble with getting AM reciever to work

    I would move the diode to the front end for detection, as berkeman suggested, and use the op amp for audio amplification. Also use a germanium diode (such as the 1N34A) instead of silicon.
  14. TurtleMeister

    What was your first computer?

    TRS80 model 1. I later added the expansion interface which gave me 16k of ram. I then added the 360k floppy drive for $500 and then the line printer for $1000 (the line printer was used).
  15. TurtleMeister

    B F=ma -- True or an Illusion...

    The op may be confusing force with kinetic energy.
  16. TurtleMeister

    Why do objects fall at the same speed in free fall?

    I noticed a typo in one of my equations which has been corrected, but I cannot correct it in your post where you quoted me. I'm glad I was able to help with your understanding of the UFF.
  17. TurtleMeister

    Why do objects fall at the same speed in free fall?

    The center of mass of two bodies is determined by the difference in their inertial mass. If the two bodies have the same inertial mass then this point will be one half the distance between them. Or more specifically, the distance of M1 to the center of mass is ##D\frac{M_{2}}{M_{1}+M_{2}}## and...
  18. TurtleMeister

    I Devil's Racetrack

    The explanation seems plausible to me, even without the video. Am I correct in my interpretation that it is the ice that moves the stones and not the wind directly? Or rather the wind causes the large sheets of ice to move and then the ice makes contact with the stones causing them to move also?
  19. TurtleMeister

    What are some sad songs?

    Adagio in G Minor (Albinoni/Giazotto) Even if you're not familiar with this title you may have heard it before as it has been used in film and television. I chose this arrangement by Tzvi Erez because the piano brings out the melody quite nicely. Also a couple of interesting facts about this...
  20. TurtleMeister

    B Can this plane take off?

    Here's the op: The op is not clear, and in my opinion, is the cause of the confusion. So here is my interpretation, the way I think it should be stated: Imagine a 747 sitting on a large conveyor belt, as long and as wide as the runway. The conveyor belt is designed to match the normal takeoff...
  21. TurtleMeister

    B Can this plane take off?

    There was another thread on this topic that I posted in a few years ago but I can't seem to find it. It surprises me that so many people get this wrong, even the pilot in the Myth Busters video. I think Nidum did a good job of describing the situation in his/her previous two posts. Barring...
  22. TurtleMeister

    Working with embedded systems

    You have not mentioned electronics specifically. Even if you will not be working directly (hands on) with the actual hardware itself, it would still be very beneficial for you to have a good understanding of active and passive electronic components and how they work. If you do not have this...
  23. TurtleMeister

    Python Making my web page publicly available

    That's what many people think, but it's not true. You can use a Dynamic DNS service such as No-IP.com. However, you will have to use a subdomain of one of their supplied domain names such as yourdomain.theirdomain.com. Here's how it works, briefly: You create an account with the DDNS service...
  24. TurtleMeister

    Python Making my web page publicly available

    There are some advantages to running your website on your home pc rather than using a shared hosting service. For one, you will not be limited to traditional server side scripting, such as PHP or ASP. You can do anything you want in the back-end. You can have complete and fast access to...
  25. TurtleMeister

    Stargazing Lightning ball - please help me to analyze this rare video

    I agree. But that still doesn't rule out lightning phenomena . If this is fake then hats off to the person who created it. Well done. It's actually the color change and dimming effect when it goes behind the trees that make me think this could be legitimate.
  26. TurtleMeister

    Stargazing Lightning ball - please help me to analyze this rare video

    I tend to agree with stefan r. I think the light is behind the trees. As it enters the trees, the light takes on a green tint then dims considerably. This would be expected if the light is passing through the foliage of the trees. Also, something that no one has mentioned, just before the ball...
  27. TurtleMeister

    B Can orbiting lcds replace radio towers?

    I know what he's talking about. I think reflection would be better than filtering. But I don't see how it could be better than what we already have. Two problems that come to mind right off are: 1. Would only work when there is no cloud cover. 2. Switching speed of LCDs would need to be...
  28. TurtleMeister

    Ordering of CSV table

    Windows 7 has a sort program that you can access from the command prompt. However, unless the columns are fixed width, it can only sort by the first column. At the command prompt type "sort /?" without quotes to see a list of options.
  29. TurtleMeister

    Ordering of CSV table

    If you go the programming route and you have access to the .NET framework, you may want to make use of the TextFieldParser class. Also, if I'm understanding you correctly, what you described can be done within Exel and OpenOffice. A macro (not sure if OpenOffice has macros) could be set up to...
  30. TurtleMeister

    C/++/# Assembly language programming vs Other programming languages

    Well, I think that everyone here would agree that: Machine code = low level Assembly = low level C and most everything else = high level It seems to me that the argument is whether it's ok to say that assembly is a higher level language than machine code rather than saying that they are the...
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