F = G mM / r^2, where 
<span>F = gravitational force between the earth and the moon, </span>
<span>G = Universal gravitational constant = 6.67 x 10^(-11) Nm^2/(kg)^2, </span>
<span>m = mass of the moon = 7.36 × 10^(22) kg </span>
<span>M = mass of the earth = 5.9742 × 10^(24) and </span>
<span>r = distance between the earth and the moon = 384,402 km </span>
<span>F </span>
<span>= 6.67 x 10^(-11) * (7.36 × 10^(22) * 5.9742 × 10^(24) / (384,402 )^2 </span>
<span>= 1.985 x 10^(26) N</span>
        
             
        
        
        
Answer:
A. The amount of mass changes only slightly during a chemical
reaction.
 
        
             
        
        
        
<span>Last choice on the list:
Object A has a net charge of 0 because the positive and negative 
charges are balanced. 
Object B has a net charge of –2 because there is an imbalance of 
charged particles (2 more negative electrons than positive protons).</span>