Answer:

Explanation:
As per energy conservation we know that the electrostatic potential energy of the charge system is equal to the initial kinetic energy of the alpha particle
So here we can write it as

now we know that


z = 79
here kinetic energy of the incident alpha particle is given as

now we have

now we have

 
        
             
        
        
        
Answer:
B
Explanation:
Heat increase molecular motion
 
        
                    
             
        
        
        
Answer:
Explanation:
Impulse of reaction force of floor = change in momentum 
Velocity of impact = √ 2gh₁ 
= √ 2 x 9.8 x 1.5 = 5.4 m /s.
velocity of rebound = √2gh₂ 
= √ 2x 9.8 x 1 
= 4.427 m / s.
Initial momentum = .050 x 5.4 = .27 kg m/s
Final momentum = .05 x 4.427 = .22 kg.m/s
change in momentum = .27 - .22 = .05 kg m/s
Impulse = .05 kg m /s
Impulse = force x time 
force = impulse / time 
.05 / .015 = 3.33 N.
kinetic energy = 1/2 m v² 
Initial kinetic energy = 1/2 x .05 x 5.4² 
 = 0.729 J
Final Kinetic Energy =1/2 x .05 x 4.427²
= 0.489 J
Change in Kinetic energy =0 .24 J 
Lost kinetic energy is due to conversion of energy into sound light etc.
 
        
             
        
        
        
Answer:
If I double the current in the inductor, the new total energy will become 4E (option f).
Explanation:
The coil or inductor is a passive component made of an insulated wire that stores energy in the form of a magnetic field due to its form of coiled turns of wire, through a phenomenon called self-induction. In other words, inductors store energy in the form of a magnetic field. The energy stored in the space where there is a magnetic field in the inductor is:

where E is Energy [J], L is Inductance [H] and I is Current [A].
If you double the current in the inductor, then the new value of the current is I'= 2*I. So replacing the new total energy is:

Then:

<em><u>If I double the current in the inductor, the new total energy will become 4E (option f).</u></em>