Chemical energy is transformed in your body
        
             
        
        
        
Answer:17.08 s
Explanation:
Given
distance between First and second Runner is 45.6 m
speed of first runner =3.1 m/s
=3.1 m/s
speed of second runner =4.65 m/s
=4.65 m/s
Distance between first runner and finish line is 250 m 
Second runner need to run a distance of 250+45.6=295.6 m
Time required by second runner 
time required by first runner to reach finish line
Thus second runner reach the finish line 80.64-63.56=17.08 s earlier
 
        
             
        
        
        
 Answer:
The farther star will appear 4 times fainter than the star that is near to the observer.
Explanation:
Since it is given that the luminosity of the 2 stars is same thus they radiate the same energy per unit time
Consider a spherical wave front of energy 'E' that leaves both the stars (Both radiate 'E' as they have same luminosity)
This Energy is spread over the whole surface area of sphere Thus when the wave front is at a distance 'r' the energy per unit surface area is given by 

For the star that is twice away from the earth the distance is '2r' thus we will receive an energy given by 
 
 
Hence we sense it as 4 times fainter than the nearer star.
 
        
             
        
        
        
Explanation:
it's B =) hhggusucvgaugcavsjssnd