A thin spherical shell of mass `M` and radius `R` has a small hole. A particle of mass `m` released at its mouth. Then

A solid sphere of mass M and radius R is surrounded by a spherical shell of same mass M and radius 2R as shown. A small particle of mass m is released from rest from a height h(lt lt R) above the shell. There is a hole inn the shell. QIn what time will it enter the hole at A

A solid sphere of mass M and radius R is surrounded by a spherical shell of same mass M and radius 2R as shown. A small particle of mass m is released from rest from a height h(lt lt R) above the shell. There is a hole inn the shell. QWhat time will it take to move from A to B?

A solid sphere of mass m and radius r is placed inside a hollow thin spherical shell of mass M and radius R as shown in the figure. A particle of mass m' is placed on the line joining the two centres at a distance x from the point of contact of the sphere and the shell. Find the magnitude of the resultant gravitational force on this particle due to the sphere and the shell if rltxlt2r