How far should a man go from the centre of the earth such that his weight is 1/4th that on the earth? Radius of Earth = 6400 km. [4 marks]
We know :
Weight of the body= force exerted by the body= mg=F1 ..(i)
R=radius of the earth
M= mass of the body
If the body weighs ¼ of the weight that on the earth ,then its distance from the center of the earth be R2.
Dividing (ii) by(i)
Given R1 =6400km