why weight of a body becomes zero at the centre of the earth
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Imagine that you at at the core of earth. Over there your weight would be 0 because there is no gravitational pull to pull you. Your weight depends upon the gravitational force of the object.
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You would weigh very slightly more at sea level than at the top of a mountain, not enough for you to notice, but a measurable amount. Weight, which really means gravitational force, is proportional to the product of the masses of two objects acting on each other, in this case the giant earth and the minuscule you.
Near the surface of the Earth (sea level), gravity decreases with height such that linear extrapolation would give zero gravity at a height of one half of the earth's radius - (9.8 m. s−2 per 3,200 km.)
The acceleration which is gained by an object because of the gravitational force is called its acceleration due to gravity. Its SI unit is m/s2 . ... The acceleration due to gravity at the surface of Earth is represented as g. It has a standard valuedefined as 9.80665 m/s2.
You would weigh very slightly more at sea level than at the top of a mountain, not enough for you to notice, but a measurable amount. Weight, which really means gravitational force, is proportional to the product of the masses of two objects acting on each other, in this case the giant earth and the minuscule you.
Near the surface of the Earth (sea level), gravity decreases with height such that linear extrapolation would give zero gravity at a height of one half of the earth's radius - (9.8 m. s−2 per 3,200 km.)
The acceleration which is gained by an object because of the gravitational force is called its acceleration due to gravity. Its SI unit is m/s2 . ... The acceleration due to gravity at the surface of Earth is represented as g. It has a standard valuedefined as 9.80665 m/s2.
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