Because radio waves can travel in space but sound waves cannot.
        
             
        
        
        
density = mass/volume = 100kg/10ml = 10kg/ml
voluime = mass/density = 50g/2 g/ml = 25 ml
mass = density x volume = 2x55 = 110 kg
 
        
                    
             
        
        
        
Mass/volume is density so it’s 562g/72cm^3 so it’s roughly 7.805g per cubic centimeter
        
                    
             
        
        
        
You would be correct.
Because you have only JUST released the arrow, and how close he is to the target, it would have the same amount of energy when it strikes the target. Yes, the kinetic energy would be destroyed when you hit the target but not right away. And yes, the potential energy would also be destroyed once you release the arrow, but it goes straight back once it stops moving, aka when it hits the target, although it has only just stopped moving.
Hope this helps!
 
        
             
        
        
        
Explanation:
It is given that,
Displacement of the delivery truck,  (due east)
 (due east)
Then the truck moves,  (due south)
 (due south)
Let d is the magnitude of the truck’s displacement from the warehouse. The net displacement is given by :


d = 4.03 km
Let  is the direction of the truck’s displacement from the warehouse from south of east.
 is the direction of the truck’s displacement from the warehouse from south of east.


So, the magnitude and direction of the truck’s displacement from the warehouse is 4.03 km, 37.4° south of east.