Question

how to calculate gravitational force exerted by Uranus on neptune ?

Answer 1

there closest approach is 1,466,842,684,000 meters 
F=GMm/r^2 
G is newtons constant 6.673 x 10^-11 
M is the mass of the first object 
m is the mass of the second object 
r is the distance between the two objects 
Mass of Uranus= 8.6849 × 10^25 kg 
Mass of Neptune= 1.0244 × 10^26 kg 
(6.673 x 10^-11) x (8.6849 × 10^25) x (1.0244 × 10^26) /(1,466,842,684,000)^2 
gravitational force= 2.7592334 × 10^17 Newtons<-------- between Uranus and Neptune