The Coulomb force between two charges can be attractive or repulsive. (True or false?)

The Coulomb force between two charges can be attractive or repulsive.
 
  Indicate whether the statement is true or false

Question 2

Mars currently lacks surface habitability mostly because of
 
  A) the chemical composition of its atmosphere
  B) its distance from the Sun
  C) its small size
  D) the chemical composition of its surface

Question 3

Basalt is a common type of
 
  A) meteoritic rock
  B) sedimentary rock
  C) igneous rock
  D) metamorphic rock

Question 4

The position, x, of an object is given by the equation x = A + Bt +Ct2, where t refers to time. What are the dimensions of A, B, and C?
 
  A) distance, distance, distance
  B) time, time, time
  C) distance, time, time2
  D) distance, distance/time, distance/time2
  E) distance/time, distance/time2, distance/time3

Question 5

A car of mass M, traveling with a velocity V, strikes a parked station wagon, whose mass is 2M. The bumpers lock together in this head-on inelastic collision. What fraction of the initial kinetic energy is lost in this collision?
 
  A) 1/4
  B) 1/9
  C) 1/2
  D) 2/3
  E) 1/3