Gravitation

Physics
3963 Views

A missile is launched with a velocity less than the escape velocity. The sum of its kinetic and potential energies is

A
positive
B
negative
C
zero
D
may be positive or negative depending upon its initial velocity
Medium
View solution>

A body has weight (W) on the ground. The work which must be done to lift it to a height equal to the radius of the earth, R, is

A
equal to W R
B
greater than W R
C
less than W R
D
Cannot be determined
Medium
View solution>

The ratio of acceleration due to gravity at a depth below the surface of earth and at a height above the surface for

A
is constant.
B
increases linearly with h.
C
varies parabolically with h.
D
decreases.
Medium
View solution>

Consider Earth to be a homogeneous sphere. Scientist A goes deep down in a mine and scientist B goes high up in a balloon. The gravitational field measured by

A
A goes on decreasing and that of B goes on increasing
B
B goes on decreasing and that of A goes on increasing
C
each decreases at the same rate
D
each decreases at different rates
Medium
View solution>