Home » Open thread 7/29/21

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Open thread 7/29/21 — 33 Comments

  1. Classic. I think I’ve seen that done live, though I know I’ve seen videos of it before. There are some great physics demo films made in the 50’s, in particular one on Newtonian relativity and rotating reference frames.

    Oh, here it is.
    https://www.youtube.com/watch?v=eMd0K9C5-ZA

    Check out the first couple minutes and jump to 17:00 for another cool scene.

  2. I don’t think anyone in that lecture hall will ever forget the principle of the conservation of energy. I like how he has the proper humility about it. “I trust the physics, but I don’t necessarily trust myself.” Would that all scientists remembered that.

  3. I confess to having COVID fatigue, so I wasn’t paying attention to the latest masking nonsense. I guess this article at the DailyMail gives the official U.S. gov. view.

    According to that, vaccinated people hit with the Delta variant have about the same viral load as unvaccinated people and thus can be spreaders or vectors. Except that there isn’t any data that says that. (If the data doesn’t exist, this is just science fraud.) And the data he supposedly is citing has a variety of serious problems including being rejected in its initial peer review.

    See these:
    https://therightscoop.com/um-about-that-high-delta-viral-load-that-fauci-was-talking-about-as-the-basis-for-this-new-guidance/

    https://www.americanthinker.com/blog/2021/07/the_cdc_uses_discredited_inapplicable_authority_to_back_its_new_mask_guidelines.html

    Ms. Widburg feels that the overarching motivation for this is that our overlords enjoy flexing their coercion muscles. I disagree. Along the line mentioned by Zaphod, there is a national election every two years and if there is a Machiavellian election advantage to be had, they will pursue it.

  4. Sino-America:

    https://thezman.com/wordpress/?p=24540

    “ Whether by nature or by design, the managerial class of America is taking on Chinese socialism with American characteristics. Instead of state capitalism in the Marxist sense, it is state capitalism in the corporate sense. A small number of massive corporations dominate the economy. They allow the political parties some freedom, but politics must always serve corporate interests. Private enterprise is tolerated, but it operates in the shadow of the corporate giants.

    It is on the political front where this is becoming more obvious. What the tech giants learned helping China build the surveillance state is the logic and spirit that it takes to operate it effectively. Gone unnoticed is the absence of whistle blowers from companies like Twitter and Google. One would expect regular document dumps revealing the internal workings of these firms. We have more defectors from North Korea than from Silicon Valley. The CCP has few defectors as well.

    Of course, we are seeing the rollout of a social credit system like that implemented in China, except it is being done by corporations. Mastercard maintains a special blacklist of people who cannot use the credit card system. This was originally intended to combat criminal fraud, but it has now been turned to combat dissent. Note how it is becoming normalized. This is the trick they learned from China. That which is institutionalized quickly becomes part of the public psyche.

    Another example of how the American regime is implementing Chinese authoritarianism with American characteristics is in how they are restricting speech. In China, the role of the party is explicit. The language is explicit. In America, the inner party is hidden and the delusion of self rule is their cloaking mechanism. Instead of hunting down violators of party orthodoxy, the regime is “combating misinformation” on-line. Note how this new term has been repeated by regime actors.”

  5. I used to do that same demo. One extra safety factor that comes into play is that the pendulum axis is not friction free so some of the energy is dissipated via friction. But he’s correct about being careful of the release.

    Politics: just announced that Pelosi via the Capitol Police have been ordered to ARREST anyone on the House side of the building not wearing a mask, except the representatives, who get tattled on. We are now entering even more strange territory where the Ds seem quite willing to push their tyranny further. As Geoffrey B predicts the breaking point is going to come, but then maybe that’s what they want to impose marital law and take total control.

  6. physicsguy – Don’t you assume massless ropes and frictionless pulleys? 🙂 I had a fun argument years ago with a colleague who insisted that a race car would corner just as fast on bicycle tires as is does on wide slick tires because friction only depends on the frictional coefficient and the normal force.

  7. Politics: just announced that Pelosi via the Capitol Police have been ordered to ARREST anyone on the House side of the building not wearing a mask,

    There are about 450 front line officers on an average shift and about 14,000 Republican congressional staffers. Be pretty amusing if everyone just blew off the botox bit*h.

  8. “Don’t you assume massless ropes and frictionless pulleys? ?” LOL, yes, for the Gen Phys class which has mainly premeds, bio, chem and psych majors. For the advanced intro physics for majors, throw in a bit of friction. More realisitic massive ropes etc for the sophomore majors in their Mechanics course.

    “colleague who insisted that a race car would corner just as fast on bicycle tires as is does on wide slick tires because friction only depends on the frictional coefficient and the normal force.” Seems the colleague forgot about how to calculate the friction coefficient. 🙂

  9. “Be pretty amusing if everyone just blew off the botox bit*h.”

    It’s pretty clear we’re getting close to something like that and once that Rubicon has been crossed, we’re going to be living in a country like nothing anyone has ever known.

    Mike

  10. Reminds me of a chem prof in college who poured liquid nitrogen into his mouth.

    Liquid nitrogen is at a temperature of about MINUS 320 degrees F; yes, very cold.
    Prior to doing this , the prof demonstrated , among other things, that placing a rubber ball in the nitrogen and then “bouncing” the ball, just caused the ball to shatter in many pieces – as you would expect.

    Well, he did in fact pour the liquid nitrogen in his mouth, and he was unscathed; his teeth, tongue, cheeks, lips – his entire face – all remained in place.
    Turns out that the moisture in one’s mouth provides just enough of a barrier for just enough time to protect the inside of the mouth and allow the nitrogen to dissipate and turn into a gas.

    He also told us – before placing the nitrogen in his mouth – that sweaty workers in steel mills, when accidentally placing a hand/arm in molten steel, and withdrawing the hand/arm really quickly, would not be injured.
    The reason; the sweat / moisture on the arm/hand provides just enough of a barrier – albeit for a really short time – to prevent any harm.

    Speaking of pendulums;

    One would be hard pressed to find a simpler system than the pendulum and approximate solutions describing its motion – albeit for small angular displacements – have been known for 200/300 years (or longer?).
    As far as i know, there is no EXACT solution describing the motion of the pendulum for small and not small angular displacements.
    This is really incredible because you know all the variables – exactly – that perfectly describe the system; the weight/mass of the ball, the length of the string, the initial angular displacement and to keep things simple, considering zero initial velocity imparted to the “ball.” (This latter point – zero initial velocity – is what saved the professor in the video from needing a new jaw and a new set of teeth).

    The motion of the pendulum is non-linear and all solutions describing it’s motion – as far as I know – resort to the use of numerical series solutions (which are approximate, though very good approximations.)

    So, the very simple motion of the pendulum (a non-linear system) cannot be described exactly.

    Now consider a much much more complex, non-linear system with dozens of variables; the climate (which is a very good example of a “chaotic” system).

    If the behavior of a very simple non-linear system – the pendulum – can only be described approximately, ask yourself how is it possible to describe with any degree of accuracy the behavior of a far far more complex non-linear system in which dozens of variables interact (compared to only three, known exactly, variables in the case of the pendulum) .
    Further, now attempt to describe the climate not today or next week or next year, but 25 to 100 years hence.
    Good luck with that.

    If a butterfly flaps its wings over Bogota, Columbia, can it cause a tornado in Oklahoma?
    The answer: maybe; but nobody really knows.
    It is totally unpredictable.

  11. I’ve never been more tempted to jump into the Twitter sewer today. I read some NeverTrumper tweet about how awful it is that the “politicized” Biden DOJ is warning states against undoing their pandemic voting rules. I actually would sign up for Twitter if it had a feature that automatically teleported me in front of this person with a bullhorn so I could yell “IT’S TOO BAD THERE WASN’T SOMEONE YOU COULD HAVE VOTED FOR TO PREVENT THIS!!!!”

    Mike

  12. John Tyler,

    The numeric solutions are as “exact” as you want them- just add enough terms to the series expansions. Yes, the sytem is non-linear, and is the textbook introduction to 2nd order differential equations.

  13. JohnTyler,

    Yep…the friction (axis and also to a small degree air resistance) is the factor that in part drives the non-linear motion of a pendulum and eventually results in chaotic solutions. Note that the Foucault pendulum, which can measure the earth’s rotation, has to have a driving motor to keep it swinging a regular arc.

  14. I’ve been wondering how the big tech firms have the luxury to indulge CRT worship — which will make their workforce weaker in terms of time and personnel — and I’ve concluded that FAANG (Facebook, Apple, Amazon, Netflix, Google) have carved up and dominated their markets so thoroughly, they don’t really have adversaries like in the old days of IBM vs Microsoft or Apple vs Microsoft or IBM vs Some Guys in a Garage.

    Sure, the FAANG companies jostle each other and look for openings, but they learned from the IBM and Microsoft anti-trust lawsuits that their most dangerous adversary is the US government. 

    The old solution was to give equally to both parties. However, the tech oligarchs, young tech workers and Democrats found in each other natural allies. So now their only real enemy left is conservative Americans. 

    We are the enemy. In the past year we found out what that means. In spades.

  15. Yancy and Physics Guy:

    To Yancy’s point:

    Exact as you want them – or need them – for your application is just fine, but it is not the same as an exact solution (or an exact close formed solution.)
    2+2 = 4 , which is exact, yet 2+ 2= 3.99999999 or 4.00000001 would probably suffice for most applications, but it is not exact.
    But I agree 100% with your comment !!

    If I recall correctly, I read that NASA uses the value of Pi out to 15 decimal places which obviously works just fine for them, even though Pi has an infinite number of digits.

    My point was not to illustrate the complexity / non-linearity of the pendulum, but to show how such a simple system can defy an exact solution.
    And the lesson I draw from this is that attempting to describe the behavior of far more complex systems are oft times non-tractable even though for very specific case(s) a solution (exact or not) can be derived.

    To Physics Guy;

    Was wondering;

    If a “virtual” pendulum is modeled on a computer, and values are given to the mass, length of string (given a mass of zero) and initial angular displacement (with zero initial velocity) would an exact solution be forthcoming??
    Or would approximate numerical solutions still be necessary?
    After all, the computer model can be formulated to have zero friction, zero air resistance, zero string mass; that is, remove the “real world” affects.

    Just wondering.

  16. JohnTyler,

    What you are describing is exactly the Gen Phys solution: Theta(t)= Theta(0)*cos(wt)…exact solution to d2Theta/dt2 + (g/L)*(theta)= 0 for small angles where sin(theta) = theta

  17. Gargling with liquid nitrogen, at 1:00 time.
    https://www.youtube.com/watch?v=gO4G5tXTxVI

    I once did a demo on a stage in front of a large group of high school physics teachers that required some liquid nitrogen. As I finished, the following presenter, a wild and crazy professor came out on stage.

    He threw half a styrofoam cup of liquid nitrogen into his mouth, gargled it for a couple seconds, and then spit the remainder out onto the front row of people in the audience. Presumably, the droplets were small enough and dispersed enough before they hit the people’s clothing. Oh my.

    The man was the chairman of the Stanford physics dept., Doug Osheroff.

  18. Sure, the FAANG companies jostle each other and look for openings, but they learned from the IBM and Microsoft anti-trust lawsuits that their most dangerous adversary is the US government. — huxley

    You’ve got the gist of it correct, but I think the U.S. gov. can also be their ally particularly when it comes to the EU government. So carrot and stick.

    Many years ago GE and Honeywell were going to merge. The biggest manufacturer of jet engines and the biggest manufacturer of aircraft instrumentation. The EU anti-trust branch stopped it.

    There have been many forays into adding EU taxes onto the U.S. tech giants. I think most have failed, though I don’t really know. Just lately, Biden and Treas. Sec. Yellen have conspired (loaded term alert) with the EU &/or G20 officials to create a global minimum corp. tax of 15%. That’s a shot across the bow of Ireland who’s tax is much lower and companies like Apple who uses or had used a “double Irish Dutch sandwich” tax strategy.

    Maybe it is mostly a stick these days, although if enough campaign cash rolls in, some of those sticks may disappear.

  19. … I think the U.S. gov. can also be their ally particularly when it comes to the EU government. So carrot and stick.

    TommyJay:

    That’s certainly true. About the only time I’m happy with the EU is when they are putting a stick into Big Tech spokes.

  20. Bauxite, your colleague has greater faith in the sidewalls of the bicycle tires, than I have.

  21. The one great thing about bicycle tyre is that you’re not going to be aqua planing.

  22. Yep that’s the interview. Dutton uploads to both sites.

    No TL;DW — probably nothing you don’t know anyway.

    She’s now rather orthodox in outlook. Grew up on communes in the 70s.

    The way I digest these things is whilst doing household chores. Either bluetooth headphones or carry a bluetooth speaker around with me like an old timer coot with his pocket transistor radio.

  23. The way I digest these things is whilst doing household chores.

    Likewise. But I’ve got three audiobooks going right now, so the queue is a bit full.

    (Did you know you if you enroll in Audible.com, you can listen to one free audiobook a month?)

  24. @huxley:

    Audiobooks… That’s weird… I do all these tech things and have all these hacks to keep myself busy and amused… go nuts if I get caught anywhere without reading material… and yet somehow have never gotten into the Audible Thing — I better go download it immediately and see if having it on my phone makes it happen.

  25. Re: Audible.com…

    Zaphod:

    I listen to it through my browser. It’s a good time.

    Currently I’m listening to Leslie Kean’s “Surviving Death: A Journalist Investigates Evidence for an Afterlife.”

    https://www.amazon.com/Surviving-Death-Leslie-Kean-audiobook/dp/B06WLMY8W8/ref=sr_1_1

    There is more to it than I thought, going beyond the Near Death Experience (NDE) material everyone has heard about.

    There have been some real scientists a-gathering data and a-cogitating theories. One such is that our beyond-earth soul/personality resides in the 5th Dimension.

    Up, up and away!

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