The oscillation of rod oa about o is defined by the relation θ 5 (3yπ)(sin πt), where θ and t are expressed in radians and seconds, respectively. collar b slides along the rod so that its distance from o is r 5 6(1 2 e22t ) where r and t are expressed in inches and seconds, respectively. when t 5 1 s, determine (a) the velocity of the collar, (b) the acceleration of the collar, (c) the acceleration of the collar relative to the ro

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.