Answer:
The electromagnetic spectrum comprise a lot of waves length. Usually, different waves length are called as different lights, and a light source can emit in more than a different wave length, as the sun does, for example. The sun emit the visible light, UV light, infrared, etc.
 
        
             
        
        
        
A sound wave is a longitudinal wave caused by vibrations and carried through a substance. The particles of the substance, such as air particles, vibrate back and forth along the path that the sound waves travel. Sound is transmitted through the vibrations and collisions of the particles. 
This could maybe help you with your answer.
 
        
             
        
        
        
Answer:
 2.55sec
Explanation:
time = distance/speed = (87 m)/(34 m/s) = 2.55sec
 
        
             
        
        
        
The heat of fusion for water is the amount of energy needed for water to <span>melt. (c)</span>
        
                    
             
        
        
        
C. Negative force. The dog isn't going to learn that way.