Calculate the gravitation force of attraction between two planets of 1024kg and 1027kg separated by a distance of 1020meters.

A.

6.67N

B.

6.56N

C.

7.5N

D.

8.6N

Correct answer is A

F = (Gm1m2) ÷ r2

M1 = 1024Kg, M2 = 1027Kg , r = 102

(Note: the gravitational constant of G = \(6.67 × 10^{ 7ndash; 11}\) \( Nm^2/Kg^2 \)

F = \( (6.67 × 10^{– 11 + 24 + 27)} 10^40 = 6.67 × (10^40 ÷ 10^40)

= 6.67N

f = 6.67N