Gravity and Sound Waves

Link #1 was very cool. Thanks for sharing. I had no idea that a vacuum chamber of that size existed. Truly a mechanical marvel.

Pretty cool. Must have very good sealing on all doors and if you notice the feathers do not waver in the free fall.

I agree with you. I'm more impressed by the size of the vacuum chamber.

Wow. I wonder how long it takes to pump it down?

I think they said something like 3 hours.

Yep. At time marker 2:10.

Cox's statement "...near perfect vacuum inside..." should've been followed up with a comparison with the actual vacuum that exists beyond (above) the earth's atmosphere.

Used to work at a natural gas turbine manufacturer where they built turbines for power generation industry (read very large) we had a vacuum chamber that they vibration tested the rotors in that was every bit that big. only problems we encountered when in use was that the lube oil for the rotor would vaporize under vacuum..............made a hell of a mess out of everything and it would pull the guts out of the lighting ballasts in the chamber (before you ask, yes they were supposedly rated for this duty) we regularly pulled in excess of 5 Torr in this chamber.

Only thing I hated was venting the chamber after a run....noisy as hell!!

what is the force which pulling feather/ball downwards?.

Their respective weights.

The better term is mass.

The force is simply gravity and it is 9.807 m/s2 at Earth's surface.

The equation for that force is: F=ma

Where:

m = mass of the object

a= acceleration or 9.80665 m/s2

I always seem to have troubling getting my head around Einstein's statement that these objects are not falling, because in our frame of reference, and with the background indexing the relative motion, we see them falling. Wasn't Einstein saying that within the inertial frame of reference of the bowling ball and/or the feathers, there is no sense of the action of a force (apparent "weightlessness"). Also he viewed things in terms of not as much the gravitational acceleration, but the normal motion of objects traveling in the distorted space-time framework of a nearby massive object. Could someone please elaborate just a bit more on this for me?

I also enjoyed viewing the clip of the 2D standing wave flames. Makes me wonder if burner instability in boilers that are just warming up at low gas flow may have something to do with standing wave dynamics?

The thing about gravity is that it is essentially an inertial-less drive.

That is, every atom receives the same force as its neighbor.

You could fall into Jupiter, a neutron star, or even a black hole and not feel any acceleration, at least not until you get within a few radii of the attracting object, then tidal forces come into play and you no longer have equal forces across all the atoms in your body. Some people call it noodling.

The fact that every atom receives the same force is what causes the weightless feeling. You could accelerate from zero to near the speed of light in 60 seconds and feel nothing as long as all atoms in your body received the same magnitude of force.

Thank you for the clarity on that. Brings a different perspective on "noodling", of which I know at least three definitions now.

(1) it is what we do with wives, girlfriends.

(2) it is a way to catch catfish under rocks in rivers (although one might just as easily catch a snake), also known as grappling.

(3) being stretched into a "noodle" by large tidal forces, or uneven stretching of time-space in an event horizon, such that one former part feels a different acceleration that the latter part.

Gravity exists even in a vacuum on earth. Gravity also exists in space, just at a much lower exertion. That is why satellites fall out of orbit.