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    New study about the rise in global sea levels

    He who evokes Star Trek in a serious discussion loses. But... This discussion smells exactly like ONE Vulcan displaying "intellectual superiority" before a LARGE group of "irrational humans". Not in 'real life', but on TV. FICTIONAL. And not because it makes sense, but in order to illustrate...
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    B Dwarf Planet or Stellar Moon?

    It's a stupid question with a stupid answer. The dictionary seems not to know what a moon is. Thus, the question, and the argument.
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    B Milky Way is "in the top percentile of all the galaxies that exist"

    A Dunning-Kruger demonstration? Allow me to proceed. The interesting thing is we have a fairly good view of one galaxy, and are making sweeping claims about all the others, many of which are permanently out of sight. The other interesting thing is, the word Galaxy might arguably include these...
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    I Guarding Mars' atmosphere with a magnetic shield

    Seems temporary. And vulnerable to a missile, if someone lacks patience. How much trouble in tossing a phone pole sized bar magnet very precisely (smart bomb) at the Poles of the Planet? How many would it take to magnetize the planet? Would't really matter where you set up the factory. Robots...
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    B Are black holes perfect spheres?

    I'll go check. I'll let you know what I find out.
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    Why colonize Mars and not the Moon?

    Strike that word 'potential'. We are fairly clever apes. We just might invent something.
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    Why colonize Mars and not the Moon?

    Air. Mars has some, the Moon has none. If you are going to try to make something, it's good to have something to work with. Where would Dillinger be without that bar of soap?
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    Could a ballistic missile be used to deliver cargo?

    It would be better to use a phone to ask someone already there to deliver one of whatever the heck is so damn important. Trying to think what it might be. FAIL.
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    Could fracking technology be used to raise land threatened with water inundation

    But there are no peer reviewed scientific references regarding using fracking to raise land.
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    How is it possible that friction = centripetal force for turns?

    Well then. You better forget everything I said.
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    How is it possible that friction = centripetal force for turns?

    Travis. A.T. Please pick up a bowling ball. Hold it at arms length, head high. Now, rest. Does it not upon due examination turn out that YOU, yes YOU, were holding the ball up? And what happened to the ball? Did it not achieve of it's own volition the lowest potential energy state available...
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    How is it possible that friction = centripetal force for turns?

    Not at all. A car on a hill will roll down the hill. It is the brake, acting continuously, that prevents the car from rolling. A magnet stuck to a fridge would, if not for the magnetic force, fall to the floor. In both cases friction, STATIC friction... acts continuously to prevent...
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    How is it possible that friction = centripetal force for turns?

    A magnet stuck to a fridge is not at rest. It's just stuck. A car parked on an incline is not at rest. It's just parked. I specifically mentioned that. And to emphasize, Friction is the force that Resists relative motion between objects in contact. It can do so successfully. When that...
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    Speed of massless objects

    Yes. Exactly. Photon emits. Photon strikes object. No time in between. Again, I concur. At C, time stops. However, at the time of the thought experiment, Einstein could not know that, because he hadn't discovered it yet. This led him into error. In discovering and correcting that error, he...
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    Volume and mass of an atom

    Mass of proton : 1.672 621 777 x 10-27 kg +/- 0.000 000 074 x 10-27 kg Mass of neutron: 1,6749 x 10^(-27) kg Mass of electron: 0,00091x10^(-27) kg To put that another way, A Neutron weighs 1. A Proton weighs 0.99862349. Electrons weigh 0.00054386734 each. Still another way to say that...
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    How is it possible that friction = centripetal force for turns?

    To put that another way, centripetal force is generated whenever an object in motion is acted upon by a force that changes its direction. It is the friction that creates the centripetal force, by changing the direction of motion. It is turning the steering wheel that creates the friction, as...
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    Why is glass rod used in decanting?

    Plastic gets worn and metals may react. Glass is smooth so retains (wastes) little of the chemicals, is easily cleaned, is durable, is brittle so will not bend and is very obvious when it's no good anymore. And then there is that splish splash song from the 50's that I just planted in your...
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    Speed of massless objects

    I have always assumed the photon 'sees' things as Scott described. At least, since I wrapped my head around time dilation. And have wondered about the point of view of a gravity wave. Wondered too, if gravity wave is not a contradiction in terms. Regarding ...
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    Mass and thermodynamics in relativity

    If the spring stores energy, then it stores mass.
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    Mass and thermodynamics in relativity

    Is WRT a standard physics expression? Of what? And isn't the actual input of energy the initial squeeze or stretch, and not the cycling of balls? Isn't that that the actual source of mass under discussion? And if it is so that the Balls change mass as each is shuffled to and fro in...
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    Why do clouds move in a certain direction?

    Actually, dear girl, you were talking about wanting to know more about clouds.
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    Why do clouds move in a certain direction?

    Sometime between 1642 and his death in 1647, Evangelista Torricelli gave a lecture from which his notes survived. After he died they were among the few references to his work that remained. Upon being examined it was discovered they contained the earliest correct scientific explanation of the...
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    Why don't mirrors invert the image vertically?

    "When you look at words in a mirror, how come they're reversed left to right but not top to bottom? What's special about the horizontal axis?" If you take the mirror down from the wall and lay it on the floor. Then place the word on the floor next to the mirror, standing upright. Then sit on...
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