Answer:
If the strings have same thickness but different lengths then these parameters wave frequency, speed, wavelength will be different in the two strings. so the option d) None of the above is correct.
Explanation:
 
        
             
        
        
        
Answer:
true
Explanation:
when a ray of light travels from a less denser medium to a denser medium it tends to bend towards the normal.
 
        
                    
             
        
        
        
According to momentum conservation
15*3 = 45kgm/s
and the velocity of 5 kg mass will be 
45/5 = 9 m/s
        
                    
             
        
        
        
Animals that are the least specialized generally stand the best chance of survival when the environment suddenly and drastically changes because they're able to (Adapt to different conditions.)
        
             
        
        
        
Answer:
 k = 52.2 N / m
Explanation:
For this exercise we are going to use the conservation of mechanical energy.
Starting point. When it is 30 m high
         Em₀ = K + U = ½ m v² + m g h
Final point. Right when you hit the water
          = K_{e} = ½ k x²
 = K_{e} = ½ k x²
in this case the distance the bungee is stretched is 30 m
         x = h
as they indicate that there are no losses, energy is conserved
         Em₀ = Em_{f}
        ½ m v² + m g h = ½ k h²
        k = 
let's calculate
        k =  
        k = 52.2 N / m