A40.0 kg boy jumps on a 4.75 kg pogo stick with spring constant 3650 n/m. (a) find the angular frequency.
(b) find the frequency.
(c) find the period of the boy's motion.

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.