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Quark (2/13)



  1. Can you please help me figure out how this toy works? I realized that it is kind of wound up and it, accordingly, spins. But please help me to understand this question in more detail. Perhaps someone has some ideas? I would be very grateful. I would especially appreciate diagrams.
  2. When the car is stationary, the aromatic liquid in the bottle is quite mobile and changes its horizontal position as the bottle is tilted. At the same time, when the car is moving, the liquid level remains parallel to the bottom of the bottle as it oscillates. Why does this happen?
  3. Thank you very much. If anybody have something to add, you're welcome
  4. It seems to me that in the future the boundary between upper-atmosphere flight, which is already considered space, will be erased. For example, this is indicated by the transition of some state air forces to air-space forces. As spaceflight technology becomes cheaper and more widespread, the boundary defined by commercial flights will rise. Nevertheless, let us remember that earlier attempts have been made to fly mediocre flights in near-space by airlines to reduce the cost of conventional commercial flights. Such programs failed, but this is a rather mediocre example.
  5. Can you please help me to explain from the most scientific point of view (it would be great if there were formulas) why icebergs do not sink? I would be very grateful.
  6. How to use this photo to estimate the distance from the Earth to the Moon during the annular solar eclipse on June 21, 2020. We only know that the distance from the Earth to the Sun that day was 152036000 km. Please help me with this difficult task - I've been working on it for a week, but I can't find anything worthwhile on the Internet.
  7. Hello, everybody. I am doing my project right now and found very interesting research paper, which very straightly answers to my question. I saw big resonance and that you guys were interested in, so I am here with this link. Link: https://www.pnas.org/doi/10.1073/pnas.1117774109#AS-t01
  8. Good day. I am very thankful for everybody, who takes a part in this conversation. And, you, @studiot, very right now. Thank you for alternative point of view: it`s very important for my question. I want to say "thanks" one more time for everybody.
  9. Thank you everyone. I am very glad to see how interesting this topic is. One more time thanks!
  10. Yes, it's minerals, which are necessary for life organism creation. Thanks! )
  11. Thanks everybody for your answers! If you maybe have some else thinkings about my question-welcome. I will be very glad for them.
  12. Yeah. Y u r right. I will be glad to see the most full answer, which u can give. Thanks.
  13. Life is thought to have originated in seawater. Analyse the chemical composition of a cell and indicate the ideal place for the origin of life on our planet.
  14. It's not about which parasites are best for their master at all. The question means that the best parasite is the one that best avoids its host's immune system, which makes it invisible. And so the question needs to learn which parasites can boast such characteristics and what processes and mechanisms are responsible for it.
  15. Analyse the strategies of exploitation of the host and ways of avoiding the immune response by parasites and suggest, in your opinion, the best parasite among the existing ones and ways of fighting against such "elusive Avenger"?
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