force exerting on the sun?

Question

The earth (mass= 5.98 x 20^24 kg) orbits around the sun (mass= 1.99 x 10^30) at an average distance of 1.50 x 10^1 m. What force does the earth exert on the sun?

a. 5.29 x 10^33 N
b. 5.28 x 10^32 N
c. 3.53 x 10^22 N
d. 8.85 x 10^8 N

please explain thoroughly how to do this problem.. please.

Answer 1

Please use Newton's law of universal gravitation:
F = G*m1*m2/r^2
where G is a constant, and you know m1, m2 and r. You only need to put in all the numbers and perform calculation.

Please read:
http://en.wikipedia.org/wiki/Gravitational_force