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Class 11
Science
Physics
Gravitation
Two bodies of masses m and 4m are placed at a distance r. The gravitational potential at a point on the line joining them where the gravitational field is zero is:
(a)
−
r
4
G
m
(b)
−
r
6
G
m
(c)
−
r
9
G
m
(d)
zero
Correct answer:
(c)
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sound
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The correct figure is
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T
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T
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here
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if the mass of sun and planet are
M
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m
respectively then as per Newton's law of gravitational the force of alteaction between them is
F
=
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2
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M
m
, here
G
is gravitational constant. The relation between
G
and
K
is described as
A man first swims in sea water and then in river water. Compare the weights of sea water and river water displaced by him.
Imagine a new planet having the same density as that of earth but
3
times bigger than the earth in size. If the acceleration due to gravity on the surface of earth is
g
and that on the new plane is
g
, then :
A spring balance measures the weight of an object in air to be
0
.
1
N
. It shows a reading of
0
.
0
8
N
when the object is completely immersed in water. If the value of acceleration due to gravity is
1
0
m
/
s
2
, the volume of the object is
The mean radius of earth is R, its angular speed on its own axis is w and the acceleration due to gravity at earth's surface is g. What will be the radius of the orbit of a geostationary satellite
A satellite S is moving in an elliptical orbit around the earth. The mass of the satellite is very small compared to the mass of the earth.
The dependence of acceleration due to gravity
g
on the distance
r
from the centre of the earth, assumed to be a sphere of radius
R
of uniform density is as shown in Fig. below:
The correct figure is
A body projected vertically from the earth reaches a height equal to earth's radius before returning to the earth. The power exerted by the gravitational force is greatest.
Kepler's third law states that square of period revolution
(
T
)
of a planet around the sun is proportional to third power of average distance
i
between sun and planet i.e.
T
2
=
K
r
3
here
K
is constant
if the mass of sun and planet are
M
and
m
respectively then as per Newton's law of gravitational the force of alteaction between them is
F
=
r
2
G
M
m
, here
G
is gravitational constant. The relation between
G
and
K
is described as
A man first swims in sea water and then in river water. Compare the weights of sea water and river water displaced by him.
Imagine a new planet having the same density as that of earth but
3
times bigger than the earth in size. If the acceleration due to gravity on the surface of earth is
g
and that on the new plane is
g
, then :
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