The total mechanical energy of a system A) is equally ...

[melina_rosy]

The total mechanical energy of a system
 
  A)
 
  is equally divided between kinetic energy and potential energy.
  B)
 
  is either all kinetic energy or all potential energy, at any one instant.
  C)
 
  can never be negative.
  D)
 
  is constant, if only conservative forces act.
  E)
 
  is not uniquely determined for most naturally occurring systems.

Question 2

A copper penny has a mass of 3.0 g. A total of 4.0  1012 electrons are transferred from one neutral penny to another.
 
  If the electrostatic force of attraction between the pennies is equal to the weight of a penny, what is the separation between them? A)
 
  31 cm
  B)
 
  33 cm
  C)
 
  35 cm
  D)
 
  37 cm
  E)
 
  39 cm

[briezy]

Answer to Question 1

D

Answer to Question 2

C

[melina_rosy]

TY

[briezy]

You're welcome