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1.
The escape velocity of a sphere of mass 
from earth having mass 
and radius 
is given by
from earth having mass and radius is given by
2.
Gravitational potential on the surface of earth is (
mass of the earth, 
radius of earth)
mass of the earth, radius of earth)
3.
If orbital velocity of planet is given by 
, then
, then
4.
If both the masses and radius o the earth, each decreases by 50%, the acceleration due to gravity would
5.
A spherical planet for out in space has a mass 
and diameter 
. A particle of mass falling freely new the surface of this planet will experience an acceleration due to gravity which is equal to
and diameter . A particle of mass falling freely new the surface of this planet will experience an acceleration due to gravity which is equal to
6.
Kepler discovered
7.
If 
represents the radius of the orbit of a satellite of mass moving around a planet of mass , the velocity of the satellite is given by
represents the radius of the orbit of a satellite of mass moving around a planet of mass , the velocity of the satellite is given by
8.
To an astronaut in a spaceship, the sky appears
9.
In planetary motion the areal velocity of position vector of a planet depends on angular velocity 
and the distance of the planet from sun 
. If so the correct relation for areal velocity is
and the distance of the planet from sun . If so the correct relation for areal velocity is
10.
Earth binds the atmosphere because of