Gravitational Attraction

Question

Two spherical objects have masses of 8kg and 8500kg. Their centers are separated by a distance of 3400m. What is the gravitational attraction between them?

Answer 1

Gravitational force F_g = G m₁ m₂ / r² = (6.673 x 10^-11) (8 kg) (8500 kg) / (3400 m)² = 4 x 10^-13 N (only 1 sig fig in this problem).