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StringJunky

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Everything posted by StringJunky

  1. Does 'Mil' refer to a 'Thou' or a metric MM?
  2. There's a short video further down that's pretty good; the ball drops. In the drivers' frame-of-reference, the bullet would still be travelling at 200Km/H because he's moving away from the stationary bullet at that speed. You would see this better in a gravity-free environment because the bulletl wouldn't drop.
  3. Pay closeer attention to whichever sensation you are trying to enjoy at any gtiven moment.
  4. Yes, the bullet will exit for both of them but the observer on the ground will measure 400Km/H for the bullet. The driver will measure 200Km/H
  5. The car, shooter and gun are all .co-moving at the same speed , so the bullet speed from the shooters' measurement is 200Km/H. Note: In the frame of the shooter he is travelling at 0Km/h i.e.stationary so you just add the speed of the bullet to the 0Km/H. To an observer standing on the road, watching the driver shoot, you add the speed of car plus the bullet speed, which is 400Km/H. I'm ignoring air- friction forces on the bullet. The basic idea to measuring speed is that whichever position you take a measurent from should be considered stationary. i,e. 0 speed. The measurement of speed of a position is always relative to the speed of another position.
  6. It is not on my list of proriorities to go to my grave with perfect skin or indeed attempt to prolong my life to the detriment of my enjoyment.
  7. Science doesn't mean doing creative writing with artistic licence.
  8. Conflating religion and science as equivalent belief systems, like the video does, with respect to the emergence and development of life is so wrong. Science doesn't care how it happened, it just wants to know what happened, with the evidence it has available at any given time. It has no vested interest to hold on to one line of enquiry over another, unlike religion, which has a single immutable framework to describe what happened and its credibility to its proponents utterly depends on it.
  9. Time is what clocks measure, like rulers measure length. Without time everything would happen at the same moment, if at all. This is not what we observe. Without time there can't be any motion because speed is d/t. Note: this does not mean that time is motion but motion can't manifest without it.
  10. As you can see (see bolded) they are conflating the two. If I understand you right, gravity waves are more local than gravitational waves which are produced by, say, a supernova?
  11. I tried it. I don't think it's as good as Adwcleaner which is more configurable. It doesn't install permanently.
  12. What you aren't seeing is the underlying maths that underpins those ideas, If Stephen Hawking thought up and presented a DE and DM hypothesis without the maths he'd get treated just the same as anyone else and it would end up in the proverbial trash. That's how science works
  13. Yes, there's always a long latency between statutory declarations and general adoption. With some things, you've just to got wait for the old population to die off, and that could be half a century.or more. Sometimes change occurs not because people change but because they die and the next generations only knows the newer law, which will probably be 40-50 years old by then. It's successive generations that behave differently from the last and not the founding generations ...sadly.
  14. You can correct me, but isn't the phys.org article being inaccurate calling them "gravity waves" because they are actually a perturbation in spacetime and not an actual featured behaviour of spacetime normally; the waves in GR are a consequence of drastic change in mass of a cosmic body, like ripples on water?
  15. America is not unique in its racism and unjust social divides. It is manifested all over the world between different groups but the US and Europe are slowly but surely increasing equality. There is no benefit to eternally attaching fault; we learn from history and move on, determined to not make those mistakes again. As you and iNow have mentioned about the absence of a lot of Republicans, there is still alot to do... and Obama concluded as much:
  16. Trust you you to shatter my dreams of seeing wheeless skateboards and people on anti-gravity skis, sticks in hand, whizzing down the road. I thought it interesting because science says it can't be done but there's competent people always testing the consensus, even if indirectly. as in this idea. It shows that the scientific method is robust, working just fine and keeping it's eyes open for signs of change. I suppose the first hurdle to be overcome, before finding reflective material, is to find conclusive evidence of gravitons because it won't work at all theoretically with GR's model of curved spacetime will it?
  17. I recognised when Obama first became president that Bush was very gracious in defeat and I think he understood the symbolic importance of the occasion. His presence today confirms to me that he knows when to put politics aside and be an active part of defintive moments like this. I think he's choughed to bits that America has broken that taboo. Here's a transcript of his speech if people have problems with watching video, lacking time or struggle with their hearing.
  18. What struck me watching Obama is that Americans are as black as they are white. It was nice to see the archetypal white Republican Bushs' exchange with the Obamas' at the end. However Obama is viewed in the future, his election was an important landmark in US history. Symbolism iis an important feature of what defines a nation in the long term and that is what he has done: become a symbol of the bridge between American ethnicities.
  19. Part of evolution can happen that way.
  20. I think it's difficult to distinguish in a talking therapy, don't you? Placebo or not, I think it works insome circumstances and therefore useful. I wouldn't call it a pseudoscience because it's not a science. Don't knock the placebo effect. I had toothache earlier today and took two aspirin... pain was gone in a minute or two.
  21. It's a talking therapy with strategies based on accumulated empirical experience rather than on a systematic theoretical framework. Whether it works depends on the willingness of the client and skill of the counsellor. It is or was used in drug rehabilitation programs where I live.
  22. When scientists say time is 'physical' they mean it relates or pertains to physics; it doesn't mean it should be thought of as material.
  23. Camera tripod mount holes are 1/4" Whitworth. That one will probably stick around a long time everywhere. It seems the US started to adopt metric in the early 1800s. The guy who wrote the blog this is quoted from, and designs PCBs, says it is actually fully committed to metric but the powers-that-be basically went for evolution rather than revolution and it has got stuck in the process, leading to the hotchpotch adhoc situation it is in now. The whole article, including the comments, is a thoughtful synopsis of the history and uptake of the metric system. I enjoyed reading it. The contributors are like-minded to the blog author in PCBs and electronics. This part-quote is in the comments 7th down:
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