At what height from the earth's surface( say from Hyderbad, India), the earth gravitaionnal force is zero?

Answer 1

There is no such height. The earth's "gravitaionnal" attraction on you is inversely proportional to the square of your distance from the center of the earth, but never goes to zero. As you travel out from earth you may get close to other bodies whose gravitational attraction on you becomes greater than earth's, but none ever goes to zero. The sun has a gravitational attraction on you, as does the moon. Earth's is greater than either of those in "Hyderbad" (Hyderabad).

The moon's gravitational attraction on earthly objects can be seen four times per day as the tides ebb and flow, and the sun's can be seen four times per month in the "neap" tides (less extreme than average, high and low, at 1st- and 3rd-quarter moons) and "spring" tides (more extreme than average, high and low, at new moon and full moon). I don't think the gravitational attraction of Jupiter on you can be measured, but it's there. Jupiter's gravitational attraction on Saturn can be measured.

I hope you know to ignore extraordinarily nonsensical answers such as campojoe's. What holds an object in geosynchronous orbit if not the earth's gravity? The moon is much more distant than the geosynchronous distance, yet the earth's gravity holds it.

shashank_krrish thinks "... there may not b where the gravity due to earth is zero ..." but on the other hand "... there r definately many points for which the gravity of earth is zero ..." And shashank_krrish tells US that WE are wrong!!

Take special note of secretsauce's excellent description of seeming to experience zero gravity.

Answer 2

The force can never be theoritically zero. The force will drop with a inverse square proportionality to the distance from the center of the earth but will never be zero. Even at moon, the earth does exert a gravitational force. However force is basiccaly mass of the body multiplied the acceleration producduced in the body in the direction of force. The acceleration becomes very small at large heights. For light bodies, the force becomes negligible at astronomical distances.

Answer 3

The force of gravity itself never goes to zero. That is the amazing thing about gravity ... it grows less the further you are from a body (such as the earth), but it is never zero. So technically, you are affected by the gravitational pull of every single piece of mass in the universe, no matter how distant, no matter how small. (Of course this is all infinitessimal, and dwarfed by the gravity of the nearest large body.)

HOWEVER, if you are in a stable orbit (and there is no set answer to how high that is), then the centrifugal force of your rotation around the earth exactly counterbalances the force of gravity. (That's the definition of "in orbit.") So inside your spacecraft, you *experience* zero gravity. If you were to stop moving around the earth, you would then realize that gravity is still quite strong, and you would begin falling.

Answer 4

There is no such height. The force of gravity decreases with the square of the distance, but never falls entirely to zero.

Answer 5

Honey, even the moon is held in place by Earth's gravity. There is NO height, while still on Earth, that the gravity is zero.

Answer 6

common...
ALL OF THEM R WRONG
there may not b where the gravity due to earth is zero...but with respect to the objects frame of referance... there r definately many points for which the gravity of earth is zero...since it will b balanced by an equal force in the vector form in its opposite direction....

Answer 7

Why don't you blast a homemade rocket up there and find out. Have fun! lol jk I'm not sure. srry bout tha joke. :)

Answer 8

About 26000 miles. Geosyncronosis orbit

Answer 9

500000000 miles

Not joking. It maybe some other figure, but you didn't ask for the least did you?