Chapter 9

NCERT
Class 9
Science
Solutions
3. What is the magnitude of the gravitational force between the earth and a 1 kg object on its surface? (mass of the earth is 6 × 1024 kg and radius of the earth is 6.4 × 106m).

Question:

What is the magnitude of the gravitational force between the earth and a 1 kg object on its surface? (mass of the earth is 6 × 1024 kg and radius of the earth is 6.4 × 106m).

Answer:

F = G mm/R2

F = (6.67 X 10-11 X 6 X 1024 X 1)/(6.4 X 106)2

F = 9.8 N

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