Q14 of 46 Page 247

Renu is standing in a dining line 6.38 x 103 km from the centre of the earth. The mass of the earth is 6 x 1024 kg.

Find the acceleration due to gravity.

Mass of the earth, M = 6 × 1024 kg

Radius of the earth, R = 6.38 x 103 km = 6.38 × 103 × 103 m


= 6.38 x 106 m



Where G is the universal gravitational constant ( = 6.67 × 10-11 Nm2kg-2),


M is the mass of the Earth,


R is the radius.


So g =


= 0.9831 × 10


= 9.83 ms-2


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