Answer:
  E_aprox = 1.003 E_real
Explanation:
In this exercise we are given the expression for the electric field of a dipole in the axis direction of the dipole
          E_real = k 2q d / √(z² + d²)³
          
I think your equation has some errors.
In this case they indicate that d is the separation of the charges of the dipole
in the case of z »d this equations approximates
         E_aprox = k 2q  d/ z³
calculate the value for the two cases
          E_real = k2q  d / √[ ((23d)² + d²)³]  
          E_real = k2q  d / d³ 12201
          E_real = k2q   1/12201 d²
          E_aprox = k2q   d / (23.00d)³
          E_aprox = k2q   1/12167 d²
          
     the error between these quantities is
         E_aprox / E_real = 12201 d² / 12167 d²
         E_aprox / E_real = 1.003
         E_aprox = 1.003 E_real
 
        
             
        
        
        
Answer:
The formulas of the reactants are C3H8 and O2. The formulas of the products are CO2 and H2O.
Explanation:
Propane is the third member of the alkane group with the general formula CnH2n+2. According to this question, propane burns in oxygen to produce carbon dioxide and water. This means that propane and oxygen are the reactants of this reaction while carbon dioxide and water are the products. 
The chemical formulas of the respective reactants and products are as follows:
REACTANTS:
Propane = C3H8 i.e C3H(2×3)+2
Oxygen = O2
PRODUCTS:
Carbon dioxide = CO2
Water = H2O
The balanced chemical reaction is as follows:
C3H8 + 5O2 ----> 3CO2 + 4H2O
 
        
                    
             
        
        
        
Answer:
Most of the frogs have webbed feet which helps them swim. The thin skin between the toes helps them to push through the water. The frog's feet is webbed ,So they can easily swim.. The skin between toes are flexible soo they can freely push and pull it
Explanation:
 
        
                    
             
        
        
        
Killed in accident or injured