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Class 11
Science
Physics
Gravitation
A mass
m
is placed inside a hollow sphere of mass M as shown in figure. The gravitaional force on mass
m
is
(a)
R
2
G
M
m
(b)
r
2
G
M
m
(c)
(
R
−
r
)
2
G
M
m
(d)
zero
Correct answer:
(d)
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The satellite of mass m revolving in a circular orbit of radius r around the earth has kinetic energy E. then, its angular momentum will be
The acceleration due to gravity at a height
1
k
m
above the earth is the same as at a depth
d
below the surface of earth. Then :
Buoyant force experienced by a solid is _____ the weight of the fluid displaced by it
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
Construction of submarines is based on
The ratio of escape velocity at earth
(
v
e
)
to the escape velocity at a planet
(
v
y
)
whose radius and density are twice
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?
A man first swims in sea water and then in river water. Compare the weights of sea water and river water displaced by him.
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