GravitationHard
Question
A mass 6 × 1024 kg ( = mass of earth) is to be compressed in a sphere in such a way that the escape velocity from its surface is 3 × 108 m/s (equal to that of light). What should be the radius of the sphere ?
Options
A.9 mm
B.8 mm
C.7 mm
D.6 mm
Solution
As, ve = 
, R = 
, ∴
= 9 × 10-3m = 9 mm
, R = , ∴ = 9 × 10-3m = 9 mmCreate a free account to view solution
View Solution FreeMore Gravitation Questions
Average density of the earth...A geostationary satellite is orbiting the earth at a height of 5R above the surface of the earth, R beingthe radius of t...If a satellite orbits as close to the earth′s surface as possible...The acceleration due to gravity at a height 1 km above the earth is the same as at a depth d below the surface of earth....There is a concentric hole of radius R in a solid sphere of radius 2R. Mass of the remaining portion is M. What is the g...