1) 0N... friction opposes the motion of an object, since the block is at rest there is no motion thus no friction
2) F=ma
 = (5.5kg)(30m/s)
 =165 N
        
             
        
        
        
Answer: The color is orange, the state of matter is liquid
Explanation:
 
        
                    
             
        
        
        
Answer:
Range of wavelength will be  to
 to 
Explanation:
We have given range of frequency is 400-560 Hz
Speed of the light 
We have to find the range of the wavelength of signal transmitted 
Ween know that velocity is given by  , here
, here  is wavelength and f is frequency
 is wavelength and f is frequency
So for 400 Hz frequency wavelength will be 
And wavelength for frequency 560 Hz 
So range of wavelength will be  to
 to 
 
        
             
        
        
        
Johann Strauss II
hope this helps