Find the percentage decrease in weight of a body, when taken 16 km below the surface of the earth. Take radius of the earth as 6400 km.
Here, R = 6400 km; x = 16 km
The value of acceleration due to gravity at a depth x,
If m is mass of the body, then mg and mg' will be respectively weight of the body on the surface of earth and at a depth of h below the surface of the earth. Then, % decrease in the weight of the body