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Class 11
Science
Physics
Gravitation
The change in the value of 'g' at a height 'h' above the surface of the earth is the same as at a depth 'd' below the surface of earth. When both 'd' and 'h' are much smaller then the radius of earth, then which one of the following is correct?
(a)
d
=
2
3
h
(b)
d
=
2
h
(c)
d= h
(d)
d =2h
Correct answer:
(d)
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sound
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Can you make iron to float? How?
A body weighs
5
N
in air and
2
N
when immersed in a liquid. The buoyant force is
The liquid in which iron can float is
A remote-sensing satellite of earth revolves in a circular orbit at a hight of
0
.
2
5
×
1
0
6
m
above the surface of earth. If earth's radius is
6
.
3
8
×
1
0
6
m
and
g
=
9
.
8
m
s
−
2
, then the orbital speed of the satellite is
Two spherical bodies of masses
m
and
4
m
and radii R and 2R respectively are released in free space with initial separation between their centres equal to 15 R. If they attract each other due to gravitational force only, then the distance covered by smaller sphere just before collision will be
Every liquid exerts an upward force on the objects immersed in it. The upward force is
called ________.
The acceleration due to gravity on the planet
A
is
9
times the acceleration due to gravity on planet
B
. A man jumps to a height of
2
m
on the surface of
A
. What is the height of jump by the same person on the planet
B
?
FIll in the blank.
When a solid floats in a liquid, the weight of _______ by its immersed part of the solid is equal to the weight of the solid.
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