The mass of the earth is 6 × 1024 kg and that of the moon is 7.4 1022 kg. If the distance between the earth and the moon is 3.84105 km, calculate the force exerted by the earth on the moon. G = 6.7 10–11 N m2 kg-2.

NCERT Class IX
Sciences - Main Course Book

Chapter 10. Gravitation

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2015-05-22T13:17:56+05:30

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M1 = 6 * 10^24 kg
m2 = 7.4 * 10^22 kg

d = 3.84 * 10^5 km

Gravitational force =  G m1 m2 / d^2
       F = 6.7 * 10^-11  *    6 * 10^24  *  7.4 * 10^22 / (3.84 * 10^5)^2
          = 2 * 10^26  Newtons
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