Answer:
Total displacement will be 47 meter 
Total distance will be 83 meters
Explanation:
We have given that first the student go eastward towards bus stop 20 meters 
But he realizes that she dropped his physics notebook and so h=she turns back along the same way up to 18 meters 
So displacement = 20-18 = 2 meters 
And he travel 45 meters in east along the bus stop so total displacement = 45+2 = 47 meters 
Total distance traveled by the student = 20+18+45 = 83 meters  
 
        
             
        
        
        
The electrostatic potential energy, U, of one point charge q at position d in the presence of an electric field E is defined as the negative of the work W done by the electrostatic force to bring it from the reference position d to that position

Thus, to double the electric potential energy U we need to reduce the distance of separation by half (1/2) because they are inversely proportion
 
        
             
        
        
        
Answer:
 the acceleration of harry is equal to 66.126 m/s²
Explanation:
given,
harry is 35 m behind Draco
speed of Draco = 40 m/s
original speed of harry = 50 m/s
acceleration = ?
time taken by the Draco 
     t = 
 
      t = 1.875 s
distance covered by Harry
   d = 35 + 175 = 210 m
to calculate the acceleration of harry 


a × 3.516 × 0.5 = 116.25
a = 66.126 m/s²
hence, the acceleration of harry is equal to 66.126 m/s²
 
        
             
        
        
        
Answer:54.70 N
Explanation:
Given
Gauge Pressure of 
i.e. 
Effective area 
initial Pressure
Gauge Pressure 


Force creates a pressure of  which will be equal to Gauge Pressure
 which will be equal to Gauge Pressure




