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Category: physics
Quotes of Category: physics
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  1. Paul Davies _ About Time: Einstein's

    Perhaps there are many "nows" of varying duration, depending on just what it is we are doing. We must face up to the fact that, at least in the case of humans, the subject experiencing subjective time is not a perfect, structureless observer, but a complex, multilayered, multifaceted psyche. Different levels of our consciousness may experience time in quite different ways. This is evidently the case in terms of response time. You have probably had the slightly unnerving experience of jumping at the sound of a telephone a moment or two before you actually hear it ring. The shrill noise induces a reflex response through the nervous system much faster than the time it takes to create the conscious experience of the sound.It is fashionable to attribute certain qualities, such as speech ability, to the left side of the brain, whereas others, such as musical appreciation, belong to processes occurring on the right side. But why should both hemispheres experience a common time? And why should the subconscious use the same mental clock as the conscious?
    book-quotetimetime-passingphysics

  2. Paul Davies _ About Time: Einstein's

    Until now, I've been writing about "now" as if it were literally an instant of time, but of course human faculties are not infinitely precise. It is simplistic to suppose that physical events and mental events march along exactly in step, with the stream of "actual moments" in the outside world and the stream of conscious awareness of them perfectly synchronized. The cinema industry depends on the phenomenon that what seems to us a movie is really a succession of still pictures, running at twenty-five {sic} frames per second. We don't notice the joins. Evidently the "now" of our conscious awareness stretches over at least 1/25 of a second.In fact, psychologists are convinced it can last a lot longer than that. Take he familiar "tick-tock" of the clock. Well, the clock doesn't go "tick-tock" at all; it goes "tick-tick," every tick producing the same sound. It's just that our consciousness runs two successive ticks into a singe "tick-tock" experience-but only if the duration between ticks is less than about three seconds. A really bug pendulum clock just goes "tock . . . tock . . . tock," whereas a bedside clock chatters away: "ticktockticktock..." Two to three seconds seems to be the duration over which our minds integrate sense data into a unitary experience, a fact reflected in the structure of human music and poetry.
    book-quotetimerealitytime-passing

  3. Mario Livio _ The Golden Ratio: The Story of

    The strength of the familiar electromagnetic force between two electrons, for example, is expressed in physics in terms of a constant known as the fine structure constant. The value of this constant, almost exactly 1/137, has puzzled many generations of physicists. A joke made about the famous English physicist Paul Dirac {1902-1984}, one of the founders of quantum mechanics, says that upon arrival to heaven he was allowed to ask God one question. His question was: "Why 1/137?
    book-quoteheavenphysicsquantum-mechanics

  4. James S.A. Corey _ Cibola Burn

    The velocities and forces involved in anything at orbital altitudes were enough to kill a human with just the rounding error. At their speeds, the friction from air too thin to breathe would set them on fire.
    book-quotephysicsspeedfriction

  5. James S.A. Corey _ Abaddon's Gate

    Given their current circumstances, things would have to be very bad indeed for Tilly to think the situation had gotten worse. Sure, they were all trapped in orbit around an alien space station that periodically changed the rules of physics and had killed a bunch of them, but now they'd decided to start shooting each other too.Yes, very bad.
    book-quotedeathphysicsbad

  6. Neil deGrasse Tyson _ The Sky Is Not the Limit:

    Unlike what you may be told in other sectors of life, when observing the universe, size does matter, which often leads to polite 'telescope envy' at gatherings of amateur astronomers.
    book-quoteuniversephysicsneil-degrasse-tyson

  7. Neil deGrasse Tyson _ Death by Black Hole: And Other

    Let's grant that the stars are scattered through space, hither and yon. But how hither, and how yon? To the unaided eye the brightest stars are more than a hundred times brighter than the dimmest. So the dim ones are obviously a hundred times farther away from Earth, aren't they?Nope.That simple argument boldly assumes that all stars are intrinsically equally luminous, automatically making the near ones brighter than the far ones. Stars, however, come in a staggering range of luminosities, spanning ten orders of magnitude ten powers of ten. So the brightest stars are not necessarily the ones closest to Earth. In fact, most of the stars you see in the night sky are of the highly luminous variety, and they lie extraordinarily far away.If most of the stars we see are highly luminous, then surely those stars are common throughout the galaxy.Nope again.High-luminosity stars are the rarest. In any given volume of space, they're outnumbered by the low-luminosity stars a thousand to one. It's the prodigious energy output of high-luminosity stars that enables you to see them across such large volumes of space.
    book-quotephysics

  8. Dan Brown _ Angels & Demons

    Leonardo believed his research had the potential to convert millions to a more spiritual life. Last year he categorically proved the existence of an energy force that unites us all. He actually demonstrated that we are all physically connected… that the molecules in your body are intertwined with the molecules in mine… that there is a single force moving within all of us." Langdon felt disconcerted. And the power of God shall unite us all. "Mr. Vetra actually found a way to demonstrate that particles are connected?" "Conclusive evidence. A recent Scientific American article hailed New Physics as a surer path to God than religion itself.
    book-quotesciencespiritualityreligion

  9. Richard Feynman _ The Quotable Feynman

    Take this neat little equation here. It tells me all the ways an electron can make itself comfortable in or around an atom. That's the logic of it. The poetry of it is that the equation tells me how shiny gold is, how come rocks are hard, what makes grass green, and why you can't see the wind. And a million other things besides, about the way nature works.
    book-quotenaturemathematicsphysics

  10. Richard P. Feynman _ The Feynman Lectures on

    CURIOSITY DEMANDS THAT WE ASK QUESTIONS,THAT WE TRY TO PUT THINGS TOGETHER AND TRY TO UNDERSTAND THIS MULTITUDE OF ASPECTSAS PERHAPS RESULTING FROM THE ACTION OF A RELATIVELY SMALL NUMBER OF ELEMENTALTHINGS AND FORCES ACTING IN AN INFINITE VARIETY OF COMBINATIONS
    book-quotesciencephysicsparticles

  11. Richard P. Feynman _ Six Easy Pieces: Essentials of

    If instead of arranging the atoms in some definite pattern, again and again repeated, on and on, or even forming little lumps of complexity like the odor of violets, we make an arrangement which is always different from place to place, with different kinds of atoms arranged in many ways, continually changing, not repeating, how much more marvelously is it possible that this thing might behave? Is it possible that that "thing" walking back and forth in front of you, talking to you, is a great glob of these atoms in a very complex arrangement, such that the sheer complexity of it staggers the imagination as to what it can do? When we say we are a pile of atoms, we do not mean we are merely a pile of atoms, because a pile of atoms which is not repeated from one to the other might well have the possibilities which you see before you in the mirror.
    book-quotephysicsrichard-feynmansix-easy-pieces

  12. Richard Feynman _ Surely You're Joking, Mr.

    I noticed that the {drawing} teacher didn't tell people much... Instead, he tried to inspire us to experiment with new approaches. I thought of how we teach physics: We have so many techniques - so many mathematical methods - that we never stop telling the students how to do things. On the other hand, the drawing teacher is afraid to tell you anything. If your lines are very heavy, the teacher can't say, "Your lines are too heavy." because *some* artist has figured out a way of making great pictures using heavy lines. The teacher doesn't want to push you in some particular direction. So the drawing teacher has this problem of communicating how to draw by osmosis and not by instruction, while the physics teacher has the problem of always teaching techniques, rather than the spirit, of how to go about solving physical problems.
    book-quoteteachingphysicsrichard-feynman
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