The mass of the earth is 6.0 x 1024kg and that of the moon is 7.0 x 1022kg. If the distance between them is 4.0 x 108m, calculate the force of attraction between them. [G = 6.7 x 10-11Nm2kg-2]

A. 1.8 x 10^5N
B. 1.8 x 10^10N
C. 1.8 x 10^15N
D. 1.8 x 10^20N

Correct Answer: Option D

D. 1.8 x 10^20N

Explanation

F = GM1M2/R^2

F = 6.7×10^−11×6.0×10^24×7.0×10^2/2(4×108)^2

= 1.8 x 10^20N