A 5.00 kg box on an elevator travels at a constant velocity upward. What is the normal force on the box? A) 5.00 N
B) 54.0 N
C) 44.0 N
D) 49.0 N

Which of the following correctly describes what happens when an atomic bomb explodes? small pieces of fissionable material are joined and form a body with a mass greater than the critical mass, the relative number of neutrons escaping decreases, and a chain reaction and explosion result. large pieces of fissionable matter are brought together quickly and form a body with a mass smaller than the critical mass, the relative number of escaping neutrons increases, and a chain reaction and explosion result.