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1.
In the following four periods
(i) Time of revolution of a satellite just above the earth's surface
(ii) Period of oscillation of mass inside the tunnel bored along the diameter of the earth
(iii) Period of simple pendulum having a length equal to the earth's radius in a uniform field of
(iv) Period of an infinite length simple pendulum in the earth's real gravitational filed
(i) Time of revolution of a satellite just above the earth's surface
(ii) Period of oscillation of mass inside the tunnel bored along the diameter of the earth
(iii) Period of simple pendulum having a length equal to the earth's radius in a uniform field of
(iv) Period of an infinite length simple pendulum in the earth's real gravitational filed
2.
The height from the earth surface at which the value of acceleration due to gravity reduces to 
of its value at earth's surface (assume earth to be sphere of radius 
)
of its value at earth's surface (assume earth to be sphere of radius )
3.
A space ship moves from earth to moon and back. The greatest energy required for the space ship is to overcome the difficulty in
4.
If the mass of earth is 80 times of that of a planet and diameter is double that of planet and 
on earth is 
, then the value of on that planet is
on earth is , then the value of on that planet is
5.
An iron ball and a wooden ball of the same radius are released from a height 
in vacuum. The time taken by both of them to reach the ground is
in vacuum. The time taken by both of them to reach the ground is
6.
If gravitational force on a body of mass 1.5 kg at point is 45N, then the intensity of the gravitational field at that point is
7.
A man inside an artificial satellite feels weightlessness because the force of attraction due to earth is
8.
A geostationary satellite is orbiting the earth at a height of 6
above the surface of the earth; R being the radius of the earth. What will be the time period of another satellite at a height 2.5 R from the surface of the earth?
above the surface of the earth; R being the radius of the earth. What will be the time period of another satellite at a height 2.5 R from the surface of the earth?
9.
If the radius of the earth shrinks by 1%, its mass remaining same, the acceleration due to gravity on the surface of earth will
10.
If a body describes a circular motion under inverse square field, the time taken to complete one revolution T is related to the radius of the of the circular orbit is