Chapter 9

NCERT
Class 9
Science
Solutions
16. Calculate the force of gravitation between the earth and the sun, given that the mass of earth = 6 × 1024 kg. and of the sun = 2 × 1030 kg. The average distance between the two is 1.5 × 1011 m.

Question:

Calculate the force of gravitation between the earth and the sun, given that the mass of earth = 6 × 1024 kg. and of the sun = 2 × 1030 kg. The average distance between the two is 1.5 × 1011 m.

Answer:

Mass of the earth Me = 6 × 1024 kg

Mass of the sum Ms = 2 × 1030 kg

The average distance between the two (r) = 1.5 × 1011

∴ Gravitational force (f ) = G mems / R2

f = (6.67 x 10-11 x 6 x 1024 x 2 x 1030) / (1.5 x 1011)2

f = 3.56 × 1022 N

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