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Question

Calculate the force of gravitation due to earth on a ball of 1 kg mass lying on the ground.(Mass of earth =6×103 km; and G=6.7×1011Nm2/kg2)

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Solution

Gravitational force between earth and ball,
=GMmR2 [Neglecting the radius of ball as it is small]
=6.67×1011×6×1024×1(6400×103)2
=9.77×103×1011×10291010=9.77N

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