A tunnel is dug along the diameter of the earth (Radius & mass )

PHYSICS · Subjective · A Level · Physics · Fields and their consequences · Fields and their consequences

Problem

A tunnel is dug along the diameter of the earth (Radius

R

& mass

M

). There is a particle of mass

m

at the centre of the tunnel. Find the minimum velocity given to the particle so that it just reaches to the surface of the earth is

\sqrt{\frac{GM}{nR}}

. Find

n