A non-conducting sphere of radius R = 7 cm carries a charge Q = 4 ...

[JGIBBSON]

A non-conducting sphere of radius R = 7 cm carries a charge Q = 4 mC distributed uniformly throughout its volume.
 
  At what distance, measured from the center of the sphere does the electric field reach a value equal to half its maximum value? A)
 
  3.5 cm only
  B)
 
  4.9 cm only
  C)
 
  3.5 cm and 9.9 cm
  D)
 
  3.5 cm and 4.9 cm
  E)
 
  9.9 cm only

Question 2

If an object was freely falling, from what height would it need to be dropped to reach a speed of 70.0 m/s before reaching the ground?
 
  A)
 
  250 m
 
  B)
 
  322 m
 
  C)
 
  189 m
 
  D)
 
  500 m
 
  E)
 
  712 m

[whitcassie]

Answer to Question 1

C

Answer to Question 2

A

[JGIBBSON]

TYSM

[cpetit11]

Gracias!