Answer:
0.208 N
Explanation:
We are given that 


Distance,d=0.41 m
The magnitude of the net electrostatic force experienced by any charge at point 4
Net force,






Where 


 
        
             
        
        
        
The top pair of pliers failed to loosen a stubborn bolt, but the bottom pair successfully removed it. Because the contact between the bolt and the   pliers working surface is less.
<h3>What is mechanical advantage ?</h3>
Mechanical advantage is a measure of the ratio of output force to input force in a system, it is used to obtained efficiency of the given mechanical machine.
The efficiency to open the stubborn bolt depends upon the contact between the working surface of the pliers and the bolt.
The contact between the bolt and the top pair of pliers working surface is less. Its mechanical advantage is less.
Hence, the top pair of pliers failed to loosen a stubborn bolt, but the bottom pair successfully removed it.
To learn more about the mechanical advantage, refer to the link;
brainly.com/question/7638820
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The rate at which velocity changes is called acceleration. (Attensity exists when velocity varies.) If a moving object changes speed.
Why does time accelerate the rate at which velocity changes?
A motion's acceleration is the rate at which it changes from one velocity to another. A velocity's rate of change with respect to time is referred to as its acceleration. The amount and direction of acceleration are both properties of a vector quantity.
A change in velocity is known as what?
A velocity change's acceleration is measured. Acceleration is the measure of how quickly a velocity changes with time. The acceleration measure used in SI is M/s2.
To know more about velocity visit: brainly.com/question/18084516?
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Answer:
i. The radius 'r' of the electron's path is 4.23 ×  m.
 m.
ii. The frequency 'f' of the motion is 455.44 KHz.
Explanation:
The radius 'r' of the electron's path is called a gyroradius. Gyroradius is the radius of the circular motion of a charged particle in the presence of a uniform magnetic field.
                  r = 
Where: B is the strength magnetic field, q is the charge, v is its velocity and m is the mass of the particle.
From the question, B = 1.63 ×  T, v = 121 m/s, Θ =
T, v = 121 m/s, Θ =  (since it enters perpendicularly to the field), q = e  = 1.6 ×
 (since it enters perpendicularly to the field), q = e  = 1.6 ×  C and m = 9.11 ×
C and m = 9.11 ×  Kg.
Kg.
Thus, 
          r =  ÷ sinΘ
 ÷ sinΘ 
But,  sinΘ =  sin  = 1.
 = 1.
So that;
           r = 
             = (9.11 ×  × 121) ÷ (1.6 ×
 × 121) ÷ (1.6 ×  × 1.63 ×
  × 1.63 ×  )
)
             = 1.10231 ×  ÷ 2.608 ×
   ÷ 2.608 × 
             = 4.2266 ×  
 
             = 4.23 ×  m
 m
The radius 'r' of the electron's path is 4.23 ×  m.
 m.
B. The frequency 'f' of the motion is called cyclotron frequency;
            f = 
              =  (1.6 ×  × 1.63 ×
  × 1.63 ×  ) ÷ (2 ×
) ÷ (2 × × 9.11 ×
 × 9.11 ×  )
)
              =  2.608 ×  ÷  5.7263 ×
 ÷  5.7263 × 
              = 455442.4323 
           f  = 455.44 KHz
The frequency 'f' of the motion is 455.44 KHz.