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Class 11
Science
Physics
Gravitation
If g is the acceleration due to gravity on the earth's surface, the gain in the potential energy of an object of mass m raised from the surface of the earth to a height equal to the radius R of the earth, is
(a)
2
1
m
g
R
(b)
2mg R (c )
(c)
mg R
(d)
4
1
m
g
R
Correct answer:
(a)
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1
0
R
from earth's surface, where
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is the radius of the earth?
The escape velocity for a body projected vertically upwards from the surface of the earth is
1
1
.
2
k
m
s
−
1
. If the body is projected in a direction making an angle
4
5
∘
with the vertical, the escape velocity will be
A seconds pendulum is mounted in a rocket. Its period of oscillation decreases when the rocket
Two particles are placed at some distance. If the mass of each of the two particles is doubled, keeping the distance between them unchanged, the value of gravitational force between them will be
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Name the scientist who gave the magnitude of buoyant force acting on a solid object immersed in a liquid.
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A plenet moving along an elliptical orbit is closest to the sun at a distance
r
1
and farthest away at a distance of
r
2
. If
v
1
and
v
2
are the linear velocities at these points respectively, then the ratio
v
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