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About BaalChatzaf

  • Rank
  • Birthday 08/24/1936

Previous Fields

  • Full Name
    Robert J. Kolker
  • Description
    I am retired, but far from inactive. A day without a twenty mile bicycle ride is a day without joy.
  • Favorite Music, Artworks, Movies, Shows, etc.
    Music: Mozart, Bethoven. Movie: Casablanca. Favorite Philsopher: David Hume
  • Looking or Not Looking
    not looking

Profile Information

  • Gender
  • Location
    Currently residing in New Jersey, the Bad-a-Bing State.
  • Interests
    mathematics, physics, alternative energy sources.

    I am also involved in preparing recorded books for blind and dyslexic folks.

Recent Profile Visitors

26,447 profile views
  1. ESPN, the NFL and Social Justice Warriors

    This whole kneeling thing is an example of symbolic protest. Back a few decades black American athletes raised their right fist as a symbolic protest. During the Viet Nam war some protesters turned their back on the flag when the Pledge was said. I remember I was so disgusted with LBJ no-win policy (which ultimately cost 60,000 American lives for absolutely no gain) that I would not sing the Anthem nor salute the flag. I still curse the names of Johnson and MacNamara. Feh! Phooey!
  2. Aristotle's wheel paradox

    The cyclonic storm is a marvelous beautiful instance of the so-called "Coriolis Force" which a manifestation of a mechanical references system in accelerated motion. The "force" which is manifested by the curved paths of the eye of the cyclones is not a "true force". So called centrifugal forces is also an artifact of a reference from in motion, the motion of rotating around a fixed point. It is not the result of two bodies interacting dynamically. Newton capture one of the great conservation principles in his third law. If body A pushes against body B (this is an "action") with a force F then B push back against A with force -F. Contact forces come in pairs, reaction pairs. This "law" of motion is equivalent to the conservation of linear momentum. The path of cyclonic storms are instances of conservation of angular momentum. Again, even the great genius Archimedes did not have a handle on this. Galileo was among the first to grasp inertia and momentum He plowed the road for Newton.
  3. Aristotle's wheel paradox

    That is an instantaneous point of tangency. Now you see why Newton and Leibniz had to invent calculus to deal with motion. Poor old Aristotle did not have a chance and even Archimedes who was smart enough to do it, did not invent a form a calculus for dealing with motion. Archimedes developed a theory for static balancing forces but he never invented dynamics. That came much, much later. It is "problems" like the rolling wheel and falling bodies that indicate just how essential differential calculus and differential equations are for the development of physical science. It all comes down to grasping the instantaneous, infinitesimal details of sustained motion. Motion as a unity over time and grasped instantaneously. Quite a trick!
  4. Aristotle's wheel paradox

    each point on the rim is instantaneously a tangent point for an infinitesimal interval of time. The only way to deal with this stuff in a mathematically rigorous manner is to use parametric co-ordinates with time as the driving parameter. So for each you have a hub position and a point of tangency on the rim.
  5. What things are subjective?

  6. What things are subjective?

    I used to think emotions were ka ka. But they have their uses. As long as they do not get in the way of reason and logic, all is well.
  7. Aristotle's wheel paradox

    Any translation of the center (hub) that is not accompanied by an instantaneous roll round the point of tangency at the rim is by definition a skid. Of course, we are assuming the rigidity of the wheel/circle. At no point does the wheel/circle become deformed.
  8. Aristotle's wheel paradox

    It takes two to tango....
  9. Aristotle's wheel paradox

    What paradox? There is no paradox. It is clear that the big wheel moves the hub a greater distance than the little wheel.
  10. how $400 and a car saved my life

    Automation does not eliminate the human factors. It just makes them less visible.
  11. how $400 and a car saved my life

    Nowadays with credit cards and such money seems to come "out of nowhere". Also buying stuff online has removed a human face-to-face factor in getting the stuff we want or need. Automation of monetary and commercial interactions has its uses but we also lose something in the process. Nowadays the velocity of money is well beyond the pace that could be maintained through human connection. Too many computers in the loop. Another thing... the use of computers has rendered money almost completely abstract. Money was always abstract but until the last 50 or 60 years money translations were largely done through face to face or voice to ear human interactions.
  12. how $400 and a car saved my life

    Woe! You must be a geezer yourself. My Mom was born in 1917 and my Dad in 1912. Neither of them lived as long as their parents (alas). I have lived 17 years longer than my dad 13 years longer than my mom. The Great Depression, I do not doubt, shortened their lives. I was born before WW2 and just as the Great Depression was starting to end.
  13. how $400 and a car saved my life

    That is right up there with Franscico's "money speech". Well done.
  14. Aristotle's wheel paradox

    I have Aspberger's Syndrome. I do not process sarcasm well. I tend to take people at their word literally and verbatim
  15. Aristotle's wheel paradox

    what paradox. I use my derailers every time I go out riding my bike.