Answer:
6480 km
Explanation:
The speed of the object is
v = 7500 cm/sec
We need to convert centimetres into kilometers and seconds into days. We have:


Using these conversion factors, we find:

 
        
             
        
        
        
Answer:
B)a tool to drop temperatures, mercury, an electric current, and a tool to measure resistance
 
        
                    
             
        
        
        
Electroreception is limited to aquatic environments because on here is the resistivity of the medium is low enough for electric currents to be generated as the result of electric fields of biological origin.  In air, the resistivity of the environment is so high that electric fields from biological sources do not generate a significant electric current.  Electroreceptor are found in a number of species of fish,  and in at least one species of mammal,  the Duck-Billed platypus.
        
             
        
        
        
Answer:
the minimum thickness the soap film can be if it is surrounded by air is 85.74 nm
Explanation:
Given the data in the question;
wavelength of light; λ = 463 nm = 463 × 10⁻⁹ m
 Index of refraction; n = 1.35
Now, the thinnest thickness of the soap film can be determined from the following expression;
 = ( λ / 4n )
 = ( λ / 4n )
so we simply substitute in our given values;
 = ( 463 × 10⁻⁹ m ) / 4(1.35)
 = ( 463 × 10⁻⁹ m ) / 4(1.35) 
 = ( 463 × 10⁻⁹ m ) / 5.4
 = ( 463 × 10⁻⁹ m ) / 5.4
 = ( 463 × 10⁻⁹ m ) / 4(1.35)
 = ( 463 × 10⁻⁹ m ) / 4(1.35) 
 = 8.574 × 10⁻⁸ m
 = 8.574 × 10⁻⁸ m
 = 85.74 × 10⁻⁹ m
 = 85.74 × 10⁻⁹ m
 = 85.74 nm
 = 85.74 nm
Therefore, the minimum thickness the soap film can be if it is surrounded by air is 85.74 nm