The balls in the image above have different masses and speeds. rank them in terms of momentum, from least to greatest.
c, a,d, b
a, b,c, d
d, c,b, a
b, d,a, c

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.