In phase would mean both waves are at a positive peak, out of phase would mean one is at a positive whilst the other is at a negative. Out of phase would mean the waves cancel each other out
        
                    
             
        
        
        
I know for sure that the third one is correct
        
             
        
        
        
the answer is (A) the movement of the magnet relative to the coil
 
        
                    
             
        
        
        
The centripetal force acting on the ball will be 23.26 N.The direction of the centripetal force is always in the path of the center of the course. 
<h3>What is centripetal force?</h3>
The force needed to move a body in a curved way is understood as centripetal force. This is a force that can be sensed from both the fixed frame and the spinning body's frame of concern.
The given data in the problem is;
m is the mass of A ball = 0.25 kg 
r is the radius of circle= 1.6 m rope
v is the tangential speed = 12.2 m/s
 is the centripetal force acting on the ball
 is the centripetal force acting on the ball
The centripetal force is found as;

Hence the centripetal force acting on the ball will be 23.26 N.
To learn more about the centripetal force refer to the link;
brainly.com/question/10596517
 
        
             
        
        
        
Answer:
 Volume of balloon =  1000 cm^3
Explanation:
  The head of a normal person can be assumed as a sphere with radius 10 cm.
  Volume of sphere  , where r is the radius.
, where r is the radius.
  We have approximate radius = 10 cm.
   Approximate volume of head 
  In the given options the closest value to the approximate volume is 1000 cm^3.
  So, volume of head = Volume of balloon =  1000 cm^3