How much does a black hole weigh?

Answer 1

The black hole has exactly the same 'amount of gravity' that any other object

with the same mass has. The only difference is that the black hole has it all

crammed into such a small volume that you can get much closer to it.

As long as you stay outside of an object, its gravity behaves as though the object's

mass were all located at its center. But if you dig down into the object, then only the

mass that's inside your depth counts. That's important.

Here's an example with some numbers:

-- The Earth's radius right now is 3,960 miles.

-- So the gravitational force of the Earth on you ... your 'weight' ... is the result of being

3,960 miles from the mass of the Earth.

-- And the 'escape velocity' from the Earth's surface ... the speed upward away

from the surface that you have to hit in order to escape and never be pulled back

by gravity ... is about 7 miles per second.

-- If you cram the Earth's mass into a ball that's only half as big ... 3,960 miles

all the way across its diameter ... then you would weigh 4 times as much on the

surface as you do now, and the escape velocity on the surface would grow to

9.8 miles per second.

-- Now, if you cram all of the Earth's mass into a ball that's not more than 0.7 inch across,

now you have a low-mass black hole. The escape velocity at 0.35 inch from the center

is . . . wait for it . . . the speed of light ! So any ray of light that happens to pass

this thing less than 0.35 inch from its center is doomed ... it can't escape this little

one-Earth-mass black hole.

This little black hole would have no more gravity than the Earth has right now.

The only difference is that you'd be able to get a lot closer to the center of it,

with all the mass still inside your distance.

Now you can imagine a black hole that has more than one Earth mass. In fact, it

has a million Sun masses (333 billion Earth masses), which is pretty ordinary for a

black hole. In the case of something like that, the escape velocity even at millions

of miles from the object may be the speed of light or more. It has no 'more gravity'

than any other object with the same mass would have. It's just a lot smaller.

Answer 2

If you mean "power" as is usual in physics, energy/time, I am not quite sure what you mean. It has been speculated that technology might be developed to get power from a black hole, but that would require matter falling into the black hole continuously.

If you mean how powerfully it can attract: a black hole would be just as strong as another object of the same mass. For example: if our Sun would become a black hole (which is not very likely, this is just hypothetical), it would attract planet Earth with exactly the same force as it does now - assuming of course that the distance between Sun and Earth doesn't change. The gravitational force depends only on the distance and the masses involved.

Answer 3

It is assumed that the black hole would have immense gravity so to say to attract even the light quantum. But in reality due to immense mass of black hole the space gets curved heavily and so the light going near by will be bent and get attracted by the black hole.

Answer 4

If you want to put a number on gravity, one can say the gravitational force is quantified in effect of the acceleration it has on mass, measured in meters per second squared. The larger the gravitational force, the bigger the measurable acceleration.

In the center of a black hole lies a singularity, an infinitely small point where matter is crushed to infinite density, the pull of gravity is infinitely strong, and spacetime has infinite curvature. So, you might say the biggest 'number' relating to gravity here is infinity.

Answer 5

The gravitational attraction of a black hole - or of any object for that matter - at any given distance is proportional to its mass. Thus, the gravitational attraction of a black hole that has 10 times the mass of our Sun - at any given distance - is the same as the gravitational attraction of a normal star that has 10 times the mass of our Sun - or 10 times the gravitational attraction of our Sun. You can use the formula for gravitational attraction to find out exactly how much this force is in newton, by plugging in appropriate numbers for masses (of the black hole, and of a space capsule for example), and distance.

Answer 6

Inside the so-called "event horizon", gravity is so strong that it distorts both space and time, to the point that a light ray can only go deeper into the black hole (i.e., towards the center).Outside the black hole, the gravity is just as strong as if the black hole were replace by an equal mass that is NOT a black hole. For example, if you replace the Sun by a black hole of the same mass, Earth would feel the same gravitational attraction, and continue going around the black hole.

Answer 7

The gravitational acceleration of a black hole is exactly the same as the
gravitational acceleration of any other object, whether it's a planet, a pencil,
a clump of lint, or a speck of dust.

Grav. Acceleration = G x (mass of the object) / (distance from the object squared) .

Answer 8

it depends on the weight of the origanal star. it stays the same even though the core is crushed down to a tiny fraction of its origanal size.

Answer 9

That depends on its mass. Also it is not suction, its pull: gravitational pull.

Answer 10

Gravity is what causes a black hole - an object so dense and with so much gravity collapses in on itself. There is so much gravity in a black hole that not even light can escape.