Flowing Space 101 -- Be Nimble Be Quick

"Double-A" wrote in message...
m...

With a magnet the center of the magnetic field is very close, so the
d^2 is very short, and so the force is increasing very rapidly. I
think that is what you perceive as stickiness. We are quite a
distance from the center of the Earth's gravity, so moving your foot
up and down doesn't change the force much, thus no stickiness. Also
note that the Earth's magnetic field has a more distant center of
force, and therefore it is not sticky either.

If you had a tiny black hole to play with on your desk, however, I
think you would find its gravity very sticky!

Double-A

This made me think of the large electromagnets used to lift and
move huge chunks of metal, for example in junk yards. There
would be no separating this metal if a strong enough permanent
magnet were used. Since they use an electromagnet, all they
have to do is flick a switch... and gravity brings the metal down.
I see what you mean about the tiny black hole "thought
experiment," though. You may very well be correct. There
would be no moving it from the desk unless it were an
electrogravitic bh.

Flick a switch... and it floats!

hd&ssn
Paine
tbc

Hi painius & double-a Who came up with sticky? I just tried sliding
two magnets to separate them,and its not all that easy.
Electromagnetisim can switch of its attraction,and repulsion. Its waves
can be blocked felt and only some stuff can it act on.. Gravity only
attracts,its waves can't be felt can't be blocked,and attracts
everything,and that includes energy. Magnetisim is created by virtual
photons,and gravity by gravitons(messenger particles) bert ps don't
like sticky stuff

(G=EMC^2 Glazier) wrote in message ...
Hi painius & double-a Who came up with sticky? I just tried sliding
two magnets to separate them,and its not all that easy.
Electromagnetisim can switch of its attraction,and repulsion. Its waves
can be blocked felt and only some stuff can it act on.. Gravity only
attracts,its waves can't be felt can't be blocked,and attracts
everything,and that includes energy. Magnetisim is created by virtual
photons,and gravity by gravitons(messenger particles) bert ps don't
like sticky stuff


Yeah, I hate honey!

But don't mind the taste! No, not at all!

Double-A

"G=EMC^2 Glazier" wrote...
in message ...

Hi painius & double-a Who came up with sticky? I just tried sliding
two magnets to separate them,and its not all that easy.
Electromagnetisim can switch of its attraction,and repulsion. Its waves
can be blocked felt and only some stuff can it act on.. Gravity only
attracts,its waves can't be felt can't be blocked,and attracts
everything,and that includes energy. Magnetisim is created by virtual
photons,and gravity by gravitons(messenger particles) bert ps don't
like sticky stuff

I guess i came up with "sticky," Bert. Just using it to describe the
extra little effort needed when separating magnets from each other,
or when separating a non-magnet from a magnet.

This extra effort isn't needed when you lift your foot off the planet,
though. It just lifts right up with no "stickiness". So i wondered...
why the difference?

hd&ssn
Paine
tbc

Hi Paine Its that earth's gravity is millions of times weaker than
magnetisim. They could make a space ship have a magnetic floor,and
astronauts wear magnetic shoes,so they would not float around,but that
would not help anything else,and they still would need those 20 million
dollar NASA toilets.

"G=EMC^2 Glazier" wrote...
in message ...

Hi Paine Its that earth's gravity is millions of times weaker than
magnetisim. They could make a space ship have a magnetic floor,and
astronauts wear magnetic shoes,so they would not float around,but that
would not help anything else,and they still would need those 20 million
dollar NASA toilets.

Bert, would you like to know how Isaac Asimov described it?
Good! because i'm about to tell you. g ...

Now, Asimov was *not* a mathematician, but he loved math
so much that he liked to dick around with it a lot. And he was
pretty good at it, so you can check his figures if you like.

From his article "First and Rearmost" originally published in
_The Magazine of Fantasy and Science Fiction_ in October,
1964...

"Suppose that the Earth were an assemblage of nothing but its
mass in positrons (antielectrons), while the Sun were an
assemblage of nothing but its mass in electrons. The force of
attraction between them would be vastly greater than the feeble
gravitational force that holds them together now. In fact, in
order to reduce the electromagnetic attraction to no more than
the present gravitational one, the Earth and Sun would have to
be separated by some 33,000,000,000,000,000 light years
(or over 1 million times the diameter of the known Universe).

"Or suppose you imagined in the place of the Sun a million tons
of electrons (equal to the mass of a very small asteroid). And
in the place of the Earth, imagine 3 1/3 tons of positrons.

"The electromagnetic attraction between these two insignificant
masses, separated by the distance from the Earth to the Sun,
would be equal to the gravitational attraction between the
colossal masses of those two bodies right now.

"In fact, if one could scatter a million tons of electrons on the
Sun, and 3 1/3 tons of positrons on the Earth, you would
double the Sun's attraction for the Earth and alter the nature of
Earth's orbit considerably. And if you made it electrons, both on
Sun and Earth, so as to introduce a repulsion, you would cancel
the gravitational attraction altogether and send old Earth on its
way out of the Solar System."

I sincerely hope that we haven't given the mad scientists among
us any bad ideas! g

hd&ssn
Paine
tbc

(G=EMC^2 Glazier) wrote in message ...
Hi Paine Its that earth's gravity is millions of times weaker than
magnetisim. They could make a space ship have a magnetic floor,and
astronauts wear magnetic shoes,so they would not float around,but that
would not help anything else,and they still would need those 20 million
dollar NASA toilets.


You can't be too hard on NASA for spending millions to get those
toilets just right. Can you imagine the horror of an overflowing
toilet in a weightless compartment? Ha ha!

Double-A

Hi Painius Asminov was very good in writing stuff and using
comparisons. It takes a great 4electromagnetic force to keep electrons
in place. It takes a weak force of gravity to keep the Earth in place.
Bert

Hi Double-A Read the 20 million dollar NASA toilets did not work on the
first flight,and lots of **** hit the ventilation fan. Do they have
different plumbing for girl astronauts? I think the greatest invention
of man was "indoor plumbing" with the added craper feature. Bert