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Byju's Answer
Standard XII
Physics
SHM expression
derive an exp...
Question
derive an expression for acceleration due to gravity on a planet of mass 2M
E
and radius 2R
E.
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Solution
According
to
the
universal
law
of
gravitation
,
Force
between
an
object
(
placed
on
the
surface
of
earth
)
and
earth
is
given
as
,
F
=
GM
E
m
R
E
2
where
,
G
=
Gravitational
constant
M
E
=
Mass
of
earth
m
=
Mass
of
object
R
E
=
Radius
of
earth
Also
,
we
know
,
F
=
mg
So
,
mg
=
GM
E
m
R
E
2
or
g
=
GM
E
R
E
2
For
planet
of
mass
2
M
E
and
radius
2
R
E
,
g
'
=
G
×
2
M
E
(
2
R
E
)
2
=
2
GM
E
4
R
E
2
=
1
2
GM
E
R
E
2
g
'
=
1
2
g
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