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Q.

Mass of moon is 7.34×1022 kg. If the acceleration due to gravity on the moon is  1.4 m/s2, the radius of the moon is (G=6.667×10−11 Nm2/kg2)

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a

0.56×104 m

b

1.87×106 m

c

1.92×106 m

d

1.01×108 m

answer is B.

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Detailed Solution

g=GMR2⇒R=GMgSubstituting the above values we get R=1.87×106m.
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