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Topic: Strange but True

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Cincydawg

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Strange but True
« on: November 15, 2019, 04:56:52 PM »
Humid air is less dense than drier air.

Temperature drops by about 4.5°F per thousand feet of elevation (usually, there can be inversions of course).

At 17,000 feet, there is about half an atmosphere of pressure.

A cloud can weigh a million pounds.

Adult cats rarely meow at other adult cats.

Blood donors in Sweden receive a text when their blood is used.

The second highest elevation baseball stadium is in Atlanta (just outside now).

Ice made from deuterated water will sink in regular water (and can be toxic at very elevated levels over time).

Teflon was discovered by accident (along with quite a few other things, "prepared mind" being important).

If your car was able to drive vertically for an hour, you'd reach "space".


The first stage of the Saturn V rocket consumed 15 tons of fuel per second.

The communications satellite in geosynchronous orbit was envisioned in a 1947 science fiction book by Arthur C. Clarke.

A human with a long life span will have about 4 billion heartbeats.  Other mammals only live for around 1 billion heartbeats if it lives a long time and dies of "old age".






Drew4UTk

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Re: Strange but True
« Reply #1 on: November 15, 2019, 05:12:00 PM »
the first one is a bit surprising.... in sniper school it is taught that every 20% increase in relative humidity causes a one MoA drop, and every 25 degrees in temperature increase raises impact a MoA. warmer air being less dense and humid air being more difficult for the projectile to penetrate.   I've actually been witness to this, too.... 

another thing that may be of interest if that^ was... firing over a body of water has to be accounted for as they usually offer a thermal barrier.  it's almost like a rock skipping on the surface as an explanation... i've witnessed that too- especially ponds and nearing the temperature inversion point. 

of the three branches of ballistics (internal: before projectile leaves; external:what happens during flight; terminal: what happens after impact) the only one that is close to science (in that it can be duplicated precisely) is 'internal'.  Just when you think 'terminal ballistics' is the most difficult to nail down, 'external' throws a wrench in the works and surpasses it- but never for long. 

Cincydawg

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Re: Strange but True
« Reply #2 on: November 15, 2019, 05:16:22 PM »


We would worry about temperature and altitude when "driving Cessnas" on takeoff, but not humidity as it's a lesser factor.  You can see it is very small at normal temperatures.

The MW of water is only 18 of course, while nitrogen and oxygen weight more per mole.

Cincydawg

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Re: Strange but True
« Reply #3 on: November 15, 2019, 05:26:31 PM »
Electric vehicles are not out selling cars with manual transmissions in the US.

ATexasVol

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Re: Strange but True
« Reply #4 on: November 15, 2019, 09:57:14 PM »
Humid air is less dense than drier air.

Temperature drops by about 4.5°F per thousand feet of elevation (usually, there can be inversions of course).

At 17,000 feet, there is about half an atmosphere of pressure.

A cloud can weigh a million pounds.

Adult cats rarely meow at other adult cats.

Blood donors in Sweden receive a text when their blood is used.

The second highest elevation baseball stadium is in Atlanta (just outside now).

Ice made from deuterated water will sink in regular water (and can be toxic at very elevated levels over time).

Teflon was discovered by accident (along with quite a few other things, "prepared mind" being important).

If your car was able to drive vertically for an hour, you'd reach "space".

Jeffrey Epstein did not kill himself.   

The first stage of the Saturn V rocket consumed 15 tons of fuel per second.

The communications satellite in geosynchronous orbit was envisioned in a 1947 science fiction book by Arthur C. Clarke.

A human with a long life span will have about 4 billion heartbeats.  Other mammals only live for around 1 billion heartbeats if it lives a long time and dies of "old age".







Interesting factoids.   I added one.   

Cincydawg

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Re: Strange but True
« Reply #5 on: November 16, 2019, 10:03:51 AM »
The weather in Napa Valley is cooler in the south than in the north.

IMAVOL

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Re: Strange but True
« Reply #6 on: November 16, 2019, 10:50:03 AM »


We would worry about temperature and altitude when "driving Cessnas" on takeoff, but not humidity as it's a lesser factor.  You can see it is very small at normal temperatures.

The MW of water is only 18 of course, while nitrogen and oxygen weight more per mole.
More evidence to support my previous postulate.   Aeronautical engineer 

Cincydawg

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Re: Strange but True
« Reply #7 on: November 16, 2019, 01:30:46 PM »
Nope.

Cincydawg

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Re: Strange but True
« Reply #8 on: November 17, 2019, 06:10:58 PM »


Cincydawg

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Re: Strange but True
« Reply #9 on: November 19, 2019, 07:54:56 PM »
http://discovermagazine.com/2019/may/how-to-understand-einsteins-theory-of-gravity?utm_source=dscfb&utm_medium=social&utm_campaign=dscfb&fbclid=IwAR0fsm194hi8_uw0esMZJ3QNwXWkoMP9f2sH5vVMoSr5YrzvfAZU5VDouas


https://www.npr.org/2005/03/17/4538324/albert-einsteins-year-of-miracles-light-theory

https://www.smithsonianmag.com/science-nature/the-year-of-albert-einstein-75841381/

four papers that revolutionized science. One explained how to measure the size of molecules in a liquid, a second posited how to determine their movement, and a third described how light comes in packets called photons—the foundation of quantum physics and the idea that eventually won him the Nobel Prize. A fourth paper introduced special relativity, leading physicists to reconsider notions of space and time that had sufficed since the dawn of civilization. Then, a few months later, almost as an afterthought, Einstein pointed out in a fifth paper that matter and energy can be interchangeable at the atomic level specifically, that E=mc2, the scientific basis of nuclear energy and the most famous mathematical equation in history.
Read more: https://www.smithsonianmag.com/science-nature/the-year-of-albert-einstein-75841381/#6DMYpW5BFbWm4mbb.99

Cincydawg

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Re: Strange but True
« Reply #10 on: November 21, 2019, 02:21:02 PM »
The top of Mt. Everest is sedimentary rock.

Georgia Tech once beat Cumberland 222-0 in football.  Probably everyone here knew that.

The first state university to receive a charter was Georgia, but the first to open its doors and graduate a class was North Carolina.  North Carolina and Ohio "fight" over claims on license plates like "First to Flight" etc.  The first Wright Brothers flight was shorter than the length of a 747.

The Bismark was slightly smaller in displacement than the Tirpitz, both of the same class of German WW II BBs.  The Bismark was disabled partially but critically by a biplane.

The French had more tanks and heavier tanks than the Germans did in 1940.  

The Webb Space Telescope has a 6.5 m primary mirror and is slated for launch in 2021 by the French Ariane rocket to an L2 point a million miles from Earth.

https://www.jwst.nasa.gov/


Cincydawg

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Re: Strange but True
« Reply #11 on: November 24, 2019, 06:32:10 PM »

https://www.youtube.com/watch?v=cWc7vYjgnTs

Nessun dorma! Nessun dorma!
Tu pure, o Principessa,
nella tua fredda stanza,
guardi le stelle
che tremano d'amore, e di speranza!
None shall sleep! None shall sleep!
Not even you, oh Princess,
in your cold bedroom,
watching the stars
that tremble with love, and with hope!
Ma il mio mistero è chiuso in me;
il nome mio nessun saprà!
No, No! Sulla tua bocca,
lo dirò quando la luce splenderà!
But my secret is hidden within me;
no one will know my name!
No, no! On your mouth,
I will say it when the light shines!
Ed il mio bacio scioglierà
il silenzio che ti fa mia!
And my kiss will dissolve
the silence that makes you mine!



Cincydawg

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Re: Strange but True
« Reply #12 on: November 24, 2019, 06:34:44 PM »
https://photonterrace.net/en/photon/duality/

Light behaves as a wave in some experiments and a particle in others.


Cincydawg

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Re: Strange but True
« Reply #13 on: November 24, 2019, 06:36:07 PM »
https://www.sciencemag.org/news/2018/04/einstein-s-spooky-action-distance-spotted-objects-almost-big-enough-see

One of the strangest aspects of quantum physics is entanglement: If you observe a particle in one place, another particle—even one light-years away—will instantly change its properties, as if the two are connected by a mysterious communication channel. Scientists have observed this phenomenon in tiny objects such as atoms and electrons. But in two new studies, researchers report seeing entanglement in devices nearly visible to the naked eye.

https://www.technologyreview.com/s/427174/einsteins-spooky-action-at-a-distance-paradox-older-than-thought/


 

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