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Class 11
Science
Physics
Gravitation
Two particles of equal mass go around a circle of radius R under the action of their mutual gravitational attraction. Find the speed of each particle.
(a)
v
=
2
R
1
(
G
m
1
)
(b)
v
=
(
2
R
G
m
)
(c)
v
=
2
1
(
R
G
m
)
(d)
v
=
(
R
4
G
m
)
Correct answer:
(c)
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e
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The radii of circular orbits of two satellite
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and
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of the earth are
4
R
and
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, respectively. If the speed of satellite
A
is
3
v
, then the speed of satellite
B
will be
The height a which the weight of a body becomes
1
/
1
6
t
h
its weight on the surface of earth (radius
R
) is
Two astronauts are floating in gravitational free space after having lost contanct with their spaceship. The two will:
Name the principle which gives the magnitude of buoyant force acting on an object immersed in a liquid.
Two satellites of earth
S
1
and
S
2
are moving in the same orbit. The mass of
S
1
is four times the mass of
S
2
. Which one of the following statements is true?
State Archimedes' principle.
What would be the projections velocity of a satellite so that intersteller (interspace with no gravitation) velocity of the satellite becomes the orbital velocity when it is in the orbit at height of
1
0
R
from earth's surface, where
R
is the radius of the earth?
The escape velocity of a sphere of mass m is given by (G= univesal gravitational constant,
M
e
=
mass of the earth and
R
e
=
radius of the earth)
The radii of circular orbits of two satellite
A
and
B
of the earth are
4
R
and
R
, respectively. If the speed of satellite
A
is
3
v
, then the speed of satellite
B
will be
The height a which the weight of a body becomes
1
/
1
6
t
h
its weight on the surface of earth (radius
R
) is
Two astronauts are floating in gravitational free space after having lost contanct with their spaceship. The two will:
Name the principle which gives the magnitude of buoyant force acting on an object immersed in a liquid.
Two satellites of earth
S
1
and
S
2
are moving in the same orbit. The mass of
S
1
is four times the mass of
S
2
. Which one of the following statements is true?
State Archimedes' principle.
What would be the projections velocity of a satellite so that intersteller (interspace with no gravitation) velocity of the satellite becomes the orbital velocity when it is in the orbit at height of
1
0
R
from earth's surface, where
R
is the radius of the earth?
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