Question

what is the force of attraction between two metal balls of 10kg each placed at a distance of 1km?

Answer 1

m1                 =10 kg

m2                =10 kg

s                    =1 km

                     =10³ m

F                    = ?

from, F   =   G*m1*m2 /d² (∵ G = 6.67×10^-11 Nm²/kg²)

               =   6.67×10^-11×10×10/10³

               =   6.67×10^-9×10^-3

               =    6.67×10^-12 N