Un cuerpo se mueve a la derecha sobre una superficie horizontal áspera a una velocidad constante bajo la acción de una fuerza horizontal de 15 n. determine:
a) modulo y dirección de la fuerza de roce

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.