Khimraj
Last Activity: 6 Years ago
Let the mass of bigger sphere be M with rafius R. Then the mass of smaller sphere with radius R/2 is M/8.
Let the centre of the big sphere which is its centre of mass be the origin O. Then the centre of mass of the small sphere is at a distance R/2 from O.
When the small sphere is cut out, let the C.M. of the remaining portion shifts to P. Mass of remaining portion = 7M/8.
From conservation of centre of mass :
C.M. of remaining portion = C.M. of big sphere + C.M. of the small sphere.
=>

=> OP =

So, the centre of mass of the remaining portion shifts to

from tge centre of the circle.
Hope it clears.