For these question, it has two separate equations: 2f(a) and f(2a) .
For f(2a) equations its x=2a, so you must substitute 2a into the f(x) equation
For 2f(a), it means the two time of f(a) equation with x=a, so you substitute a inti f(x) equation first, then you multiply it by 2.
 
        
             
        
        
        
Answer:
C
Explanation:
Straight away from the source
 
        
             
        
        
        
The last choice is correct, in order to have kinetic energy a object must be in motion, if not then the object has no kinetic energy
        
                    
             
        
        
        
Answer:
The maximum induced emf is    
Explanation:
 From the question we are told that 
    The number of turns is 
     The area of the square wire coil is  
     The frequency of rotation is  
     The earth magnetic field at that location is   
 
The  induced emf is mathematically represented as 
          
At the maximum 
        
So 
          
Where 
      is the angular velocity which is mathematically represented as
 is the angular velocity which is mathematically represented as
           
 Substituting values
              
             
The maximum induced emf is  
           
            
      
 
        
             
        
        
        
Answer:
B. Amount of force applied to the object