Question

Two spherical balls of mass 20kg each one placed with their centres 20cm apart. find the gravitational force of attaction between them.
$g = 6.67 \times {10}^{ - 11} {nm}^{2} {kg}^{ - 2}$


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Answer 1

Answer:

F = 667 x 10-⁹ N

Explanation:

Given,

G = 6.67 x 10-¹¹

m1 = m2 = 20kg

r = 20 cm

= 0.02 m

F = G m1 m2 / r²

F = 6.67 x 10-¹¹ (20) (20) / (0.02)²

F = 667 x 4 x 10-¹¹ / 0.0004

F = 2668 x 10-¹¹ / 4 x 10-⁴

F = 667 x 10-⁷

F = 6.67 x 10-⁹ N