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Byju's Answer
Standard XII
Physics
COM of Other Bodies
At what heigh...
Question
At what height, is the value of
g
half that on the surface of earth? (
R
=
radius of the earth)
A
0.414
R
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B
R
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C
2
R
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D
3.5
R
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Solution
The correct option is
A
0.414
R
g
′
=
g
R
2
r
2
=
g
2
⇒
r
2
=
2
R
2
⇒
r
=
R
√
2
=
R
+
h
⇒
h
=
R
(
√
2
−
1
)
=
R
(
1.414
−
1
)
=
0.414
R
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