The mass of an object becomes zero at the center of the Earth. , 11 | Gravity PHYSICS |...

The weight of an object is 90 kg at the surface of the earth. If it is taken to a height equal to half of the radius of the earth, then its weight will become

A : If an object is taken to the centre of earth, then its centre of gravity cannot be defined. R : At the centre of earth acceleration due to gravity is zero.

(i) mass of a body is always constant. Why ? (ii) mass of a body can never be zero. Why ? (iii) At the center of earth, weight of a body is zero. Why ?

When an object falls freely to the earth , the force of gravity is

The centre of mass of an extended body on the surface of the earth and its centre of gravity

The binding energy of an object of mass m placed on the surface of the earth r is (R = radius of earth, g = acceleration due to gravity)

If g is the acceleration due to gravity on earth's surface, the gain of the potential energy of an object of mass m raised from the surface of the earth to a height equal to the radius R of the earth is