Answer:
Explanation:
plate separation = 2.3 x 10⁻³ m
capacity C₁ = ε A / d 
= ε A / 2.3 x 10⁻³
C₂ = ε A / 1.15 x 10⁻³
 =
 = 
a ) when charge remains constant 
energy = 
q is charge and C is capacity 
energy stored initially E₁= 
energy stored finally E₂ = 
 =
 = 
 =
 = 
= 
= 4.19 J 
b ) 
In this case potential diff remains constant 
energy of capacitor = 1/2 C V²
energy is proportional to capacity as V is constant .


 = 16.76 .
 = 16.76 . 
 
        
             
        
        
        
Answer:
<h2>62.5 m/s</h2>
Explanation:
The speed of the car can be found by using the formula

d is the distance
t is the time
From the question we have

We have the final answer as
<h3>62.5 m/s</h3>
Hope this helps you
 
        
             
        
        
        
Answer:
112.5 N 
Explanation:
50 = GMm/r^2
Let F be the new force of attraction
F/50 = ( G(3M)(3m)/(2r)^2 ) / (GMm/r^2)
[Elimiating G,M,m,r]
F = 112.5 N