The mechanical energy at top =Mechanical energy at bottom
- Mass=m=54kg
- Height=h=51m
- Acceleration due to gravity=g=10m/s^2
- Velocity=v=2.6m/s

- Final energy at bottom=The kinetic energy










 
        
             
        
        
        
<span>Hello,
The answer is:
A vibrating tuning fork is struck and begins to vibrate as the object used to strike it is placed away from the tuning fork.</span>
        
             
        
        
        
Answer:
Work is measured as the product of force and the displacement in the direction of the force. Work = force × displacement in the direction of the force.
 
        
             
        
        
        
Answer:
L = 4.711 *10^{-6} kg m2/s
Explanation:


    =4.5*10^-5
angular velocity

              = 0.1047 rad/s
the angular momentum,



 
        
                    
             
        
        
        
Answer:
Hello your question is incomplete hence I will give you a general answer on how A van de Graaff generator works 
answer : 
If the electrons falls through a PD of 150mV the electron will gain energy of   150MeV
Explanation:
when a Van de Graff generator is used to accelerate an electron through a PD ( potential difference ) of any value the particle ( electron )  the electron will gain energy  ( eV )  which is is equivalent in value of the PD it accelerated through 
hence if the electrons falls through a PD of 150mV the electron will gain energy of   150MeV