A person walks in a distance x northward, turns around and walks ...

[fahad]

A person walks in a distance x northward, turns around and walks a distance 7.00x southward. If the total displacement of the person from his starting position is 400 m south. What was the total distance walked?
 
  A)
 
  421 m
 
  B)
 
  457 m
 
  C)
 
  515 m
 
  D)
 
  533 m
 
  E)
 
  400 m

Question 2

Outside a spherically symmetric charge distribution of net charge Q, Gauss's law can be used to show that the electric field at a given distance
 
  A)
 
  must be zero.
  B)
 
  must be directed outward.
  C)
 
  acts like it originated in a point charge Q at the center of the distribution.
  D)
 
  must be directed inward.
  E)
 
  must be greater than zero.

[hramirez205]

Answer to Question 1

D

Answer to Question 2

C

[fahad]

Excellent

[aliotak]

Gracias!