Recent content by jimmy1010100

  1. J

    Insights What Discovery Will Be the Revolutionary Within 20 Years?

    Biotech - CRISPR descendent tools - Epigenetics and proteomics - New classes of drugs - Curing of many diseases - Regenerative medicine and anti-aging Agriculture - cultured meat - improvements in efficiency Materials - graphene, borophene, 2D materials - metamaterials - taller buildings and...
  2. J

    Multiple processes interpretation

    It sounds like you're thinking of the "Many Interacting Worlds" (as opposed to "Many Worlds") interpretation: https://arxiv.org/abs/1402.6144 https://arxiv.org/abs/1403.0014
  3. J

    The Physics of Power on a Bicycle

    In this animated gif you can make out the subtle reaction forces oscillating the bike back and forth on the rollers where this guy is putting well over 1500 Watts into the cranks:
  4. J

    The Physics of Power on a Bicycle

    This thread is getting repetitive. I want to reiterate what Sophie said. These terms are not just semantic choices. They are well defined, and you're doing yourself a disservice not to look them up and understand them. You seem confused about force, torque, pedal velocity and work. Alex Simmons...
  5. J

    The Physics of Power on a Bicycle

    Torque and pedal velocity aren't constant in practice, and none of the power meters have a fast sampling rate. If you have a power meter you (like the rest of us using them) must have seen the numbers jumping all over the place. They all require smoothing via averaging over period - longer than...
  6. J

    The Physics of Power on a Bicycle

    We've already answered your question, but you're not comprehending. I explicitly wrote this out for you on the previous page. No. Gearing is not resistance. The resistance comes from all the friction and drag that opposes your motion. It has nothing to do with gearing or torque. If you change...
  7. J

    The Physics of Power on a Bicycle

    Do you have a strain gauge power meter or one that estimates from speed (and thus gives you the wrong answer)? If one's power really is decreasing it's because of personal reasons rather than physics which I'll explain below. For others including myself, we stand to increase power. However, the...
  8. J

    Spacetime desynchronized in quantum realm?

    Search the forum for Hořava gravity to find much discussion. Here are some of his articles: http://arxiv.org/find/hep-th/1/au:+Horava_P/0/1/0/all/0/1
  9. J

    Epoxy Conductivity, Expansion & Contraction

    Most epoxies have poor thermal and electrical conductivity and are also non-magnetic. However, you can get conductive metal-filled epoxies. You can also get epoxy with high thermal conductivity and low electrical conductivity which are used in electronics. And there is usually no expansion or...
  10. J

    How Does Statistical Physics Influence Astrophysics and Cosmology?

    I'm not aware of the connection to statistical physics, but you may find interesting the application of the Brouwer fixed point theorem to crumpled paper: http://www.math.hmc.edu/funfacts/ffiles/20002.7.shtml
  11. J

    Would the different weight affects the speed of bicycle when coming down slope.?

    The mass comment was a separate idea from the problem. Why assume (falsely) that the density of the body is the same for everyone? Anyway, I didn't say that surface area was proportional to mass. I said that in practice (on a bike was the context) it correlates pretty well. Surface area...
  12. J

    Would the different weight affects the speed of bicycle when coming down slope.?

    Actually, surface area correlates very well with mass in humans. In practice, there will be a significant difference (well known among experienced bike racers) due to the drag (the force of which is proportional to frontal area and v^2) - especially with that kind of weight difference between...
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