The only item on that list that's an electromagnetic wave 
is C). shortwave radio waves.
        
                    
             
        
        
        
The energy carried by one photon is directly proportional to its 
frequency.  So the photon energy is greatest for the electromagnetic 
waves with the highest frequency / shortest wavelengths.  
That's why when you get past visible light and on up through ultraviolet, 
X-rays, and gamma rays, the radiation becomes dangerous ==> each 
photon carries enough energy to tear electrons away from their atoms, 
ripping molecules apart and damaging cells.
The photon with the highest energy is a gamma-ray photon. 
        
             
        
        
        
Resultant force is basically the force left after everything is added.
if a ball is being pushed one one side with 180N, and being pushed on teh opposite side with 84N (I added friction and air resistance since they're acting on the same side), then the resultant force would be:
180N - 84N =<u> 96N</u>   (you can determine whether it's positive or negative based on the direction of the vector)
 
        
             
        
        
        
Answer:
To find the mass using density and volume we just multiply them against each other which causes ml to cancel and just leaves us with grams which represents how much the item weights.



Therefore, our final answer is that our pencil weight 3.5 grams
<u><em>Hope this helps!  Let me know if you have any questions</em></u>