What is the total energy of an electron moving with a speed of ...

[captainjonesify]

What is the total energy of an electron moving with a speed of 0.95c?
 
  A)
 
  2.6  10-13 J
  B)
 
  8.2  10-14 J
  C)
 
  1.1  10-13 J
  D)
 
  1.2  10-14 J
  E)
 
  2.2  10-14 J

Question 2

A solid non-conducting sphere of radius R carries a charge Q distributed uniformly throughout its volume. At a radius r (r < R) from the center of the sphere the electric field has a value E.
 
  If the same charge Q were distributed uniformly throughout a sphere of radius 2R the magnitude of the electric field at a radius r would be equal to A)
 
  E/8.
  B)
 
  E/2.
  C)
 
  2E.
  D)
 
  8E.
  E)
 
  E.

[abro1885]

Answer to Question 1

A

Answer to Question 2

A

[captainjonesify]

Excellent

[kishoreddi]

Gracias!