Calculate the force of gravity between two obejcts of masses 1300kg and 7800kg which are 0.23 apart

Given:                                                                                                        

m1= 13000 Kg     (mass of the 1st object)                                                                                 

m2= 7800 kg        (mass of thesecond object)                                                                            

 r= 0.23 m  (distance between the two objects)

Now F= (G×m1×m2)÷r^2

G= 6.67x10^-11 Nm^2/Kg^2 (G is the gravitational constant)

F = (6.67x10^-11 ×1300×7800) ÷ (0.23)^2 =  0.0127852N

measure their densities same density, same sub

a.   mass number from atomic number