A solid non-conducting sphere of radius R carries a uniform ...

[Tazate]

A solid non-conducting sphere of radius R carries a uniform charge density. At a radial distance r1 = R/4 the electric field has a magnitude E0. What is the magnitude of the electric field at a radial distance r2 = 2R?
 
  A)
 
  E0/4
  B)
 
  0
  C)
 
  E0/2
  D)
 
  E0
  E)
 
  2E0

Question 2

Consider the potential energy U(x) = (1.0 J/m3)x3 - (8 J/m2)x2 + (15 J/m)x + 8.0 J. Find the turning points of the bound motion when the energy E is 8.0 J.
 
  A)
 
  1.0 m and 7.0 m
  B)
 
  3.0 m and 4.0 m
  C)
 
  2.0 m and 4.0 m
  D)
 
  3.0 m and 5.0 m
  E)
 
  1.44 m and 5.56 m

[kaylee05]

Answer to Question 1

D

Answer to Question 2

D

[Tazate]

Excellent

[ricroger]

Gracias!