Answer:
-30 N/C
Explanation:
Since the potential changes from 0.90 V to 1.2 V when I move the probe 1 cm closer to the non-grounded electrode, the electric field is the gradient between the two points is given by E = -ΔV/Δx where ΔV = change in electric potential and Δx = distance of potential change = 1 cm = 0.01 m
Now ΔV = final potential - initial potential = 1.2 V - 0.90 V = 0.30 V
Since E = -ΔV/Δx
substituting the values of the variables into the equation, we have
E = -ΔV/Δx
E = -0.30 V/0.01 m 
E = -30 V/m
Since 1 V/m = 1 N/C.
E = -30 N/C
So, the average electric field is -30 N/C
 
        
             
        
        
        
Answer:
The  moment of inertia is  
Explanation:
From the question we are told that 
     The  frequency is  
     The  mass of the pendulum is  
     The  location of the pivot from the center is 
      
Generally the period of the simple harmonic motion is mathematically represented as 
         
Where I is the moment of inertia about the pivot point , so making I the subject of the formula it 
=>    ![I =  [ \frac{T}{2 \pi } ]^2 *  m*  g * d](https://tex.z-dn.net/?f=I%20%3D%20%20%5B%20%5Cfrac%7BT%7D%7B2%20%5Cpi%20%7D%20%5D%5E2%20%2A%20%20m%2A%20%20g%20%2A%20d)
But the period of this simple harmonic motion can also be represented mathematically as 
         
substituting values 
       
       
So 
       ![I =  [ \frac{2.174}{2 * 3.142 } ]^2 *   2.40*  9.8 * 0.380](https://tex.z-dn.net/?f=I%20%3D%20%20%5B%20%5Cfrac%7B2.174%7D%7B2%20%2A%203.142%20%7D%20%5D%5E2%20%2A%20%20%202.40%2A%20%209.8%20%2A%200.380)
       
 
        
             
        
        
        
Answer:
1.97 * 10^8 m/s
Explanation:
Given that:
n = 1.52
Recall : speed of light (c) = 3 * 10^8 m/s
Speed (v) of light in glass:
v = speed of light / n
v = (3 * 10^8) / 1.52
v = 1.9736 * 10^8 
Hence, speed of light in glass :
v = 1.97 * 10^8 m/s
 
        
             
        
        
        
Answer:
time = 8.3333 minutes.
Explanation:
distance between earth and sun = 1.5 * 
speed of light = 3* 
convert the distance unit from km to m so we can have uniform units.
distance between earth and sun = 1.5 * m
m
distance between earth and sun = 1.5 *  m
m
speed = distance /time
time = distance / speed
time = 

time =500 sec
time = 500/60 minutes
time = 8.3333 minutes.